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Last updated: April 2026

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Quick Answer

Hashimoto's thyroiditis is an autoimmune condition estimated to affect 5% of Americans, making it the most common cause of hypothyroidism in the U.S.
Women are 4-10 times more likely to develop Hashimoto's than men, especially between the ages of 30-50.
Functional medicine focuses on uncovering root causes like infections, stress, and environmental exposures, not just managing symptoms.
Conventional annual TSH screening can miss 7% of hypothyroid cases; advanced screening can detect thyroid autoantibodies years before clinical signs and symptoms appear.

Hashimoto's thyroiditis is a complex autoimmune disease where the body's immune system mistakenly attacks the thyroid gland, leading to chronic inflammation and reduced thyroid function over time. This condition is the most common cause of an underactive thyroid, known as hypothyroidism, in the United States. While conventional medicine often manages symptoms, functional medicine takes a different approach. It seeks to uncover and address the underlying causes of Hashimoto’s using a holistic and personalized strategy that supports the body as a whole. This includes looking at factors like genetics, environmental exposures, and lifestyle choices. For instance, women are significantly more susceptible, being 4-10 times more likely to develop Hashimoto's than men, particularly between the ages of 30-50.

What is Hashimoto's Thyroiditis?

Hashimoto's thyroiditis is an autoimmune disease where the immune system, which normally protects the body from infections, mistakenly attacks its own tissues. In this specific condition, the immune system targets the thyroid gland, leading to chronic inflammation. Over time, this damage reduces the thyroid's ability to produce essential hormones, resulting in hypothyroidism, or an underactive thyroid. It is the most common cause of hypothyroidism in the United States.

The thyroid gland is a small, butterfly-shaped endocrine gland located in the neck. Its primary role is to produce and release thyroid hormones, specifically thyroxine (T4) and triiodothyronine (T3), into the bloodstream. These hormones are crucial for regulating a wide array of metabolic and essential bodily functions. They influence cardiovascular function, body temperature, body weight, and the proper functioning of the nervous system. Thyroid hormones also play a role in digestion, growth and development, menstruation, muscle contractions, breathing, and the elimination of waste from the body. When the thyroid gland is compromised by Hashimoto's, these vital functions can be disrupted.

The Autoimmune Nature of Hashimoto's

Hashimoto's is an autoimmune disorder, meaning the immune system produces antibodies that target and damage the thyroid gland. This consistent attack leads to inflammation, known as thyroiditis. The chronic inflammation gradually impairs the thyroid's capacity to produce hormones. This often leads to an enlarged thyroid, also known as a goiter. Because thyroid hormones affect nearly every organ system in the body, the effects of Hashimoto's can be widespread and varied, impacting overall health and well-being.

Hashimoto's thyroiditis is estimated to affect 5% of Americans. This makes it a significant health concern for many individuals. The prevalence of this condition also shows a clear gender disparity. Women are 4-10 times more likely to develop Hashimoto's disease than men. This increased risk is particularly noticeable in women between the ages of 30 and 50. The reasons for this gender difference are complex and may involve hormonal, genetic, and environmental factors. Understanding this predisposition is important for early detection and targeted interventions.

Impact on Overall Health

The thyroid's role in regulating metabolism means that an underactive thyroid due to Hashimoto's can lead to a broad range of symptoms that affect many bodily systems. When the thyroid doesn't produce enough hormones, the body's vital processes can slow down. This can impact energy levels, weight management, and even cognitive function. The widespread influence of thyroid hormones means that unmanaged Hashimoto's can contribute to chronic health issues. These include heart disease, heart failure, hypertension, and high cholesterol. In severe, long-term unmanaged cases, a serious condition called myxedema can occur, characterized by profound lethargy and unconsciousness as the body's vital processes significantly slow down. This highlights the importance of understanding and addressing Hashimoto's comprehensively, rather than just treating individual symptoms.

In our analysis, the functional medicine approach to Hashimoto's aims to restore balance by addressing the root causes of the immune system's attack on the thyroid, rather than solely supplementing thyroid hormones. This holistic view considers the intricate connections between different body systems and how they contribute to the autoimmune process. By focusing on these underlying factors, functional medicine seeks to support the body's natural healing mechanisms and reduce the inflammatory burden on the thyroid gland.

What are the Symptoms of Hashimoto's Disease?

The symptoms of Hashimoto's disease can be varied and often change over time, reflecting the progression of the condition. Initially, the immune attack on thyroid cells can cause an increased release of thyroid hormone into the bloodstream. This period may present as hyperthyroidism, an overactive thyroid. However, as the damage to the thyroid gland progresses and its capacity to produce hormones diminishes, the symptoms typically shift towards those of hypothyroidism, or an underactive thyroid.

Early Hyperthyroid-like Symptoms

In the initial stages of Hashimoto's, some individuals may experience symptoms that mimic hyperthyroidism. These occur due to the temporary release of stored thyroid hormones as the thyroid cells are damaged. These symptoms can include an increased appetite, noticeable sweating, and heart palpitations. Digestive changes like diarrhea may also occur. Neurological symptoms such as insomnia and anxiety are also possible during this phase. This initial period can sometimes make diagnosis challenging, as the symptoms might seem contradictory to the later presentation of hypothyroidism.

Common Hypothyroid Symptoms

After this initial phase, or sometimes from the very beginning, the signs and symptoms of hypothyroidism typically appear. These symptoms can potentially affect many organ systems in the body due to the widespread role of thyroid hormones. Persistent fatigue and low energy levels are among the most common complaints, significantly impacting daily life. Individuals may also experience unexplained weight gain or find it difficult to lose weight, even with consistent effort. Sensitivity to cold temperatures is another frequent symptom, as the body's metabolism slows down.

Skin and hair changes are also common. These include dry, thinning hair and skin, as well as brittle nails. A distinctive sign is the loss of the outer third of the eyebrows. The thyroid gland itself may become enlarged, a condition known as goiter. Musculoskeletal symptoms can manifest as muscle and joint pain, and stiffness. Mood changes are also prevalent, with many reporting depression, anxiety, and general mood swings. Cognitive issues, often referred to as "brain fog," include memory lapses and difficulty concentrating. For women, menstrual disorders or fertility issues can also arise due to the impact of thyroid hormones on reproductive health.

Long-Term Complications of Unmanaged Hypothyroidism

If not managed effectively, hypothyroidism associated with Hashimoto's can lead to a range of chronic health issues. These include serious cardiovascular problems such as heart disease, heart failure, hypertension (high blood pressure), and high cholesterol. The slowing of the body's metabolic processes over time can contribute to these complications. In severe and prolonged cases of unmanaged hypothyroidism, a life-threatening condition called myxedema can occur. Myxedema happens when the body's vital processes slow down to a critical level, presenting as profound lethargy and unconsciousness. This serious complication underscores the importance of proper diagnosis and ongoing management of Hashimoto's thyroiditis.

Functional medicine understands that these symptoms are not isolated issues but rather expressions of an underlying systemic imbalance. The approach involves looking beyond symptom management to identify and address the root causes contributing to the thyroid dysfunction and the autoimmune attack. This often includes evaluating nutrient deficiencies, gut health, stress levels, and environmental exposures, all of which can influence the severity and presentation of symptoms. By taking a comprehensive view, practitioners aim to alleviate symptoms by restoring the body's inherent balance and supporting optimal thyroid function.

How is Hashimoto's Diagnosed in Functional Medicine?

Diagnosing Hashimoto's thyroiditis in functional medicine involves a more comprehensive approach than conventional methods, aiming to detect the condition earlier and understand its underlying causes. While conventional medicine often focuses on identifying hypothyroidism once it is clinically apparent, functional medicine seeks to intervene in the early stages, sometimes even before significant symptoms appear.

Limitations of Conventional TSH Screening

Conventionally, hypothyroidism is most commonly identified when a screening serum thyroid stimulating hormone (TSH) comes back elevated. TSH is a hormone produced by the pituitary gland that signals the thyroid to produce more thyroid hormones. An elevated TSH level indicates that the pituitary is working harder to stimulate a sluggish thyroid. However, relying solely on TSH screening has its limitations. An annual screening of TSH is estimated to miss 7% of hypothyroid cases. This means a significant number of individuals with thyroid dysfunction may go undiagnosed if only TSH is measured. Missing these cases can delay appropriate intervention and allow the condition to progress, potentially leading to more severe symptoms and complications over time.

The Role of Thyroid Autoantibodies

A key difference in the functional medicine diagnostic approach is the emphasis on detecting thyroid autoantibodies. These antibodies are produced by the immune system when it mistakenly attacks the thyroid gland. Thyroid autoantibodies are detectable in patients up to years before clinical signs and symptoms appear. This early detection is critical because it offers an opportunity for proactive intervention. By identifying these autoantibodies, functional medicine practitioners can begin to address the factors contributing to autoimmunity long before the thyroid gland is severely damaged and before overt hypothyroidism develops. This allows for a focus on prevention and early support rather than waiting for full-blown disease.

Advanced screening methods, which include testing for specific thyroid autoantibodies like Thyroid Peroxidase Antibodies (TPOAb) and Thyroglobulin Antibodies (TgAb), provide a more complete picture of thyroid health. These tests help confirm the autoimmune nature of the thyroid dysfunction, even if TSH levels are still within the "normal" range or fluctuating. For instance, a patient might have normal TSH but elevated TPOAb, indicating an active autoimmune process that could eventually lead to hypothyroidism. This detailed understanding allows for personalized treatment strategies that target the immune system directly, alongside supporting thyroid function.

Comprehensive Thyroid Panels

Beyond TSH and autoantibodies, functional medicine often utilizes a comprehensive thyroid panel. This panel may include measuring free T3 and free T4 (the active forms of thyroid hormones), reverse T3, and sometimes TSH receptor antibodies (TRab) to rule out other thyroid conditions. This detailed assessment helps to evaluate how well the thyroid is producing hormones, how effectively the body is converting T4 to the more active T3, and whether there are any issues with hormone utilization at the cellular level.

When we consider the full spectrum of thyroid markers, it becomes clear that a single TSH test is often insufficient to fully understand a patient's thyroid health. Advanced screening methods and integrative approaches help healthcare providers to intervene in the early stages of Hashimoto's thyroiditis and address factors contributing to autoimmunity to support better health outcomes. This proactive stance is central to the functional medicine philosophy, which prioritizes early detection and root-cause resolution to prevent disease progression and improve overall patient well-being. This approach acknowledges that the body's systems are interconnected, and a thorough evaluation is necessary to uncover the true nature of a health challenge.

What Causes Hashimoto's Disease?

Hashimoto's disease, like all autoimmune diseases, is understood to be multifactorial. This means it arises from a complex interplay of various factors rather than a single cause. It typically develops in individuals who have a genetic predisposition, but genetics alone are not enough. Environmental factors act as triggers, leading to changes in the immune system, a loss of self-tolerance, and ultimately the production of autoantibodies that attack the body's own tissues.

Genetic Predisposition and Environmental Triggers

While a genetic component makes some individuals more susceptible to Hashimoto's, it is the interaction with environmental factors that often initiates the autoimmune process. This interplay can lead to the immune system mistakenly identifying the thyroid gland as a threat. The immune system then mounts an attack, producing antibodies that damage the thyroid. This highlights why not everyone with a genetic predisposition develops the disease, and why identifying environmental triggers is crucial in a functional medicine approach.

Specific factors that may play a role in the development of Hashimoto's include a variety of internal and external influences. These encompass nutrient levels, dietary habits, infections, certain medications, chronic stress, gut health, and exposure to various toxins. Each of these elements can contribute to the immune system dysregulation that characterizes autoimmune conditions.

Key Contributing Factors

Several specific factors are known to influence the development and progression of Hashimoto's:

Nutritional Deficiencies

Levels of essential nutrients like selenium and vitamin D are important. Selenium is crucial for thyroid hormone metabolism and antioxidant defense within the thyroid gland. Vitamin D plays a significant role in immune regulation, and deficiency has been linked to increased risk of autoimmunity. Iodine intake is also a factor. While iodine is necessary for thyroid hormone production, excessive intake, especially in genetically susceptible individuals, can sometimes trigger or worsen Hashimoto's. Balancing these nutrients is key for thyroid health.

Infections

Certain infections are suspected to act as triggers for autoimmune diseases. These infections can sometimes "molecularly mimic" body tissues, causing the immune system to mistakenly attack healthy cells. Identifying and addressing chronic or past infections can be an important part of a functional medicine protocol for Hashimoto's.

Medications and Stress

Certain medications have been implicated in thyroid dysfunction or the exacerbation of autoimmune conditions. Additionally, chronic stress is a well-known modulator of the immune system. Prolonged stress can lead to inflammation and immune dysregulation, potentially contributing to the development or flare-ups of Hashimoto's. Managing stress through lifestyle interventions is a core component of functional medicine.

Intestinal Permeability (Leaky Gut)

Intestinal permeability, often referred to as "leaky gut," is another significant factor. When the gut lining becomes compromised, it can allow undigested food particles, toxins, and microbes to enter the bloodstream. This can trigger an immune response and contribute to systemic inflammation and autoimmunity. Addressing gut health and restoring intestinal barrier integrity is often a central focus in functional medicine.

Environmental Exposures

Exposure to heavy metals and certain chemicals is a significant environmental factor. Chemicals found in plastics and pesticides, for example, may contribute to changes in intestinal health, inflammation, and thyroid autoimmunity. These substances can affect normal detoxification pathways in the body and disrupt endocrine (hormone) pathways, thereby impacting thyroid function and immune regulation. Reducing exposure to these environmental toxins is a proactive step in managing Hashimoto's. For example, according to Hashimoto's treatment protocol, exposure to heavy metals and certain chemicals, such as those in plastics and pesticides, may contribute to changes in intestinal health, inflammation, and thyroid autoimmunity by affecting normal detoxification and endocrine pathways.

Increased Risk of Other Autoimmune Diseases

People with Hashimoto's are actually at a higher risk of developing other autoimmune diseases as well. This is a crucial point in the functional medicine understanding of autoimmunity. Once the immune system has developed a tendency to attack self-tissues, it can sometimes extend this attack to other organs or systems. This interconnectedness means that addressing the root causes of Hashimoto's can also help reduce the risk of developing additional autoimmune conditions. This holistic perspective, as discussed in Hashimoto's and other autoimmune diseases, emphasizes the importance of a comprehensive approach to managing autoimmune tendencies.

Understanding these multifactorial causes allows functional medicine practitioners to develop highly personalized treatment plans. Instead of just replacing thyroid hormones, the focus is on identifying and mitigating the specific triggers and imbalances unique to each individual, thereby supporting immune regulation and thyroid health from a foundational level.

How Does Functional Medicine Address Hashimoto's?

Functional medicine takes a distinctive approach to Hashimoto's, moving beyond symptom management to uncover and address the root causes of the disease. This holistic and personalized strategy aims to support the body as a whole, recognizing that Hashimoto's is not just a thyroid problem but a systemic issue involving the immune system and various interconnected bodily functions.

Uncovering Root Causes

The core principle of functional medicine is to ask "why" an illness has occurred. For Hashimoto's, this means looking beyond the thyroid gland itself to investigate factors that may be triggering the autoimmune attack. This involves a deep dive into an individual's history, lifestyle, genetics, and environment. As Mark Hyman, MD, states, "While thyroid disease can occur in various forms, one of the most common is called Hashimoto’s thyroiditis, an autoimmune disease where the body attacks the thyroid gland and diminishes its ability to create precious hormones—ones that impact every cell of the body." This perspective guides the functional medicine practitioner to look at the entire bodily system rather than isolating the thyroid.

Key areas of investigation include:

Gut Health: Assessing for intestinal permeability (leaky gut), dysbiosis (imbalance of gut bacteria), and infections like SIBO, which can all contribute to systemic inflammation and autoimmunity.
Nutritional Status: Evaluating for deficiencies in essential nutrients like vitamin D, selenium, zinc, and iron, or imbalances in iodine intake, all critical for thyroid function and immune regulation.
Environmental Toxins: Investigating exposure to heavy metals, pesticides, and plastics, which can disrupt endocrine function and increase inflammation.
Chronic Stress: Understanding the impact of psychological and physiological stress on the immune system and adrenal function.
Infections: Identifying potential infectious triggers such as Epstein-Barr virus or H. pylori, which may initiate or perpetuate autoimmune responses.

Personalized and Holistic Strategies

Once the root causes are identified, a personalized plan is developed. This plan often involves a combination of dietary changes, targeted nutritional supplementation, lifestyle modifications, and stress management techniques. The goal is to modulate the immune system, reduce inflammation, heal the gut, and support detoxification pathways, thereby reducing the autoimmune attack on the thyroid.

Dietary changes are often foundational. This might include anti-inflammatory diets, gluten-free diets, or specific elimination diets to identify food sensitivities that could be triggering immune responses. For example, some individuals with Hashimoto's find relief from symptoms when they remove gluten from their diet. Targeted supplements are used to correct nutrient deficiencies and support specific bodily functions, such as immune balance or gut healing.

Lifestyle modifications play a significant role in treating and healing the thyroid. This includes optimizing sleep, incorporating regular physical activity, and implementing stress-reduction techniques like mindfulness, yoga, or meditation. These interventions help to create an environment within the body that supports healing and reduces the burden on the immune system.

Addressing Autoimmunity Even with Normal Antibodies

An important aspect of the functional medicine approach is its understanding that autoimmunity can fluctuate. For example, a patient may have a past diagnosis of Hashimoto's thyroiditis, and later their antibodies might be normal. This does not mean the history of autoimmunity is gone. As Chris Kresser, MS, LAc, explains, "The absence of antibodies does not eliminate a history of autoimmunity, but it offers an opportunity to reduce immune activation through targeted lifestyle and gut focused interventions." This perspective encourages ongoing support to maintain immune balance and prevent future flare-ups, even when antibody levels are not currently elevated.

Functional medicine also recognizes the gender disparity in Hashimoto's. Women are 7 to 8 times more likely than men to get Hashimoto's. This increased susceptibility often prompts a deeper look into hormonal balance, reproductive health, and how these factors interact with immune function in women. The comprehensive approach ensures that all contributing elements are considered, offering a more complete path to managing and potentially reversing the progression of Hashimoto's. This comprehensive approach is a cornerstone of the functional medicine philosophy, as detailed in Functional Medicine approach to Hashimoto's.

Can Diet Alone Treat Gut Issues Related to Hashimoto's?

While diet is a crucial component of managing Hashimoto's and its related gut issues, it is generally not sufficient on its own to fully treat complex conditions like Small Intestinal Bacterial Overgrowth (SIBO) or to fully resolve all gut symptoms. Functional medicine recognizes the significant interplay between gut health, thyroid function, and chronic inflammation, especially in midlife.

The Gut-Thyroid Connection

Many patients seeking functional medicine care present with a cluster of concerns that often include gut symptoms, overlooked thyroid irregularities, and chronic low-grade inflammation. For example, a 57-year-old woman presented with persistent constipation, post-meal fullness, inability to tolerate most grains, low energy, difficulty losing weight, and worsening rosacea. She also had a past diagnosis of Hashimoto's thyroiditis. This case highlights how gut issues are frequently intertwined with thyroid health and overall well-being. The gut plays a critical role in immune regulation, nutrient absorption, and detoxification, all of which directly impact thyroid function and the progression of autoimmune diseases like Hashimoto's.

When the gut microbiome is imbalanced or the intestinal lining is compromised (often referred to as "leaky gut" or increased intestinal permeability), it can contribute to systemic inflammation and trigger autoimmune responses. This is why addressing gut health is a cornerstone of functional medicine protocols for Hashimoto's. Symptoms like constipation, bloating, and food intolerances are often direct indicators of underlying gut dysfunction that needs to be addressed comprehensively.

Limitations of Diet for SIBO and Other Gut Conditions

While following a specific diet can provide relief for symptoms related to gut issues, it is often not enough to cure the underlying condition. For instance, in the case of SIBO (Small Intestinal Bacterial Overgrowth), diet is an important part of healing the gut, but it is not enough to truly treat the condition. SIBO occurs when there is an excessive amount of bacteria in the small intestine, which should typically have a much lower bacterial count than the large intestine. These bacteria can ferment food, leading to symptoms like bloating, gas, abdominal pain, and altered bowel movements.

Simply restricting certain foods, such as those high in FODMAPs (Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols), can reduce the fuel available for the overgrown bacteria, thereby alleviating symptoms. However, this dietary restriction does not necessarily eradicate the bacterial overgrowth itself. In fact, research suggests that eating a higher-FODMAP diet in combination with an antibiotic protocol leads to more successful eradication of the bacteria. This indicates that a multi-faceted approach, often involving antimicrobial agents in addition to dietary modifications, is necessary to effectively treat SIBO.

Comprehensive Gut-Focused Interventions

Functional medicine takes a comprehensive approach to gut health, recognizing that diet is one piece of a larger puzzle. Interventions often include:

Antimicrobial Treatments: Using herbal or pharmaceutical antimicrobials to reduce bacterial overgrowth in the small intestine.
Probiotics and Prebiotics: Reintroducing beneficial bacteria and fibers to support a healthy gut microbiome, but often after the initial overgrowth is addressed.
Gut Healing Nutrients: Providing nutrients that help repair the intestinal lining, such as L-glutamine, zinc, and collagen.
Digestive Support: Using digestive enzymes and betaine HCl to improve digestion and nutrient absorption.
Addressing Underlying Causes: Investigating and treating the root causes of gut dysfunction, such as low stomach acid, impaired motility, chronic stress, or structural issues.

In the case of the 57-year-old woman with Hashimoto's and gut symptoms, her primary goal was to reduce gut symptoms, improve energy for exercise, and lose fifteen to twenty pounds in a sustainable manner. Even though her Hashimoto's antibodies were normal at the time, indicating a period of reduced immune activation, the functional medicine approach still focused on targeted lifestyle and gut-focused interventions. This is because the absence of antibodies does not eliminate a history of autoimmunity, and maintaining gut health is crucial for preventing future immune activation. This comprehensive strategy, as outlined in A Functional Medicine Approach to SIBO & Subclinical Hypothyroidism, is designed to address the complex interplay between the gut, thyroid, and immune system, going beyond diet alone to achieve lasting health improvements.

Frequently Asked Questions

What is the main difference between conventional and functional medicine for Hashimoto's?

The main difference lies in their approach to diagnosis and treatment. Conventional medicine primarily identifies hypothyroidism when a screening serum thyroid stimulating hormone (TSH) comes back elevated and focuses on hormone replacement therapy to manage symptoms. Functional medicine, however, aims to uncover and address the root causes of Hashimoto’s. It uses advanced screening methods to detect thyroid autoantibodies years before clinical signs and symptoms appear, allowing for earlier intervention. This personalized strategy supports the body as a whole, focusing on factors like gut health, nutrient deficiencies, and environmental exposures, not just managing symptoms.

Can Hashimoto's cause both hyperthyroidism and hypothyroidism symptoms?

Yes, Hashimoto's can cause both hyperthyroidism and hypothyroidism symptoms, though it predominantly leads to hypothyroidism over time. In the initial stages, the immune attack on thyroid cells can cause an increased release of thyroid hormone into the bloodstream, presenting as hyperthyroidism with symptoms like increased appetite, sweating, heart palpitations, diarrhea, insomnia, and anxiety. However, after this period, due to changes in thyroid capacity, the thyroid's ability to produce hormones diminishes, leading to the more common signs and symptoms of hypothyroidism, such as fatigue, weight gain, cold sensitivity, and dry skin.

Why are women more susceptible to Hashimoto's?

Women are significantly more susceptible to Hashimoto's, being 4-10 times more likely to develop the disease than men, especially between the ages of 30-50. While the exact reasons are complex, they are believed to involve a combination of hormonal, genetic, and environmental factors. Hormonal differences, particularly the role of estrogen, are thought to play a part in immune system regulation. Additionally, certain genetic predispositions are more common in women, and these genetic factors can interact with environmental triggers to initiate the autoimmune process.

What are some common root causes of Hashimoto's beyond genetics?

Beyond genetic predisposition, Hashimoto's is a multifactorial condition influenced by several environmental and lifestyle factors. Common root causes include selenium and vitamin D deficiencies, imbalances in iodine intake, and various infections. Chronic stress, increased intestinal permeability (leaky gut), and exposure to environmental toxins such as heavy metals and chemicals found in plastics and pesticides are also significant contributors. These factors can trigger immune changes, leading to the loss of self-tolerance and the production of autoantibodies against the thyroid gland.

Is diet enough to manage all Hashimoto's-related symptoms, especially gut issues?

While diet is an important part of managing Hashimoto's-related symptoms, especially gut issues, it is generally not enough on its own to fully treat complex conditions like SIBO (Small Intestinal Bacterial Overgrowth). Diet can provide relief by reducing the fuel for overgrown bacteria or by eliminating inflammatory foods. However, comprehensive gut-focused interventions, which may include antimicrobial protocols (like antibiotics), specific supplements to heal the gut lining, and addressing underlying causes of gut dysfunction, are often necessary for complete eradication and lasting relief. For example, eating a higher-FODMAP diet in combination with an antibiotic protocol can lead to more successful eradication of bacteria in SIBO.