As I spent the morning chatting with my yoga teacher, I began to reflect on how yoga has shaped my life. I started practicing around 2012, and by 2014, I had earned my yoga teaching certificate. From the very first class, I was hooked. I always knew that yoga was benefiting both my mind and body, but I didn’t fully understand the mechanisms behind it. Over the years, I’ve witnessed individuals reverse autoimmune conditions simply by practicing yoga and bringing their nervous systems back into balance. It has become clearer to me that when we regulate the nervous system, we regulate inflammation. And when we regulate inflammation, we regulate immune function—including the way the body manages thyroid health.
It’s no surprise that mental health and physical health are deeply connected. Many of my clients experience overwhelming stress, anxiety, moments of depression, and an inability to manage life’s daily demands. Some of them also struggle with hypothyroidism, Hashimoto’s, lupus, and chronic fatigue, and their struggles are often dismissed until symptoms become too debilitating to ignore. One of the most overlooked and silent epidemics is subclinical hypothyroidism and depression. This condition often goes unnoticed for years, only to be discovered when lab values have significantly worsened. What makes hypothyroidism particularly interesting is its link to serotonin and somatostatin, two key players in brain chemistry. When thyroid function declines, serotonin—a neurotransmitter responsible for mood stabilization—becomes dysregulated, leading to symptoms of depression. Somatostatin, which influences thyroid hormone release, also plays a role in mood disorders, demonstrating just how intricately the thyroid and brain are connected.
The thyroid gland does much more than regulate metabolism; it directly impacts brain function. Thyroid hormones (T3 and T4) interact with serotonin pathways, influence dopamine signaling, and affect brain energy metabolism. When these hormones are deficient or poorly utilized at the receptor level, the brain struggles to maintain emotional stability, resulting in fatigue, apathy, anxiety, and deep-seated depression. Research now points to the concept of “brain hypothyroidism”, where individuals may have normal thyroid hormone levels in their blood but still experience symptoms of hypothyroidism at the cellular level in the brain. This occurs due to poor thyroid hormone conversion, receptor resistance, or impaired transport of T3 across the blood-brain barrier. Interestingly, patients with treatment-resistant depression often have underlying thyroid dysfunction, and studies have shown that adding T3 therapy to antidepressant treatment can accelerate recovery.
Another crucial piece of this puzzle is autoimmune thyroid disorders, particularly Hashimoto’s thyroiditis, in which the immune system mistakenly attacks the thyroid gland. Research shows that individuals with Hashimoto’s often have higher rates of depression, anxiety, and even suicidal ideation, with elevated thyroid peroxidase antibodies (TPOAb) and thyroglobulin antibodies (TgAb) frequently found in those with mood disorders. But here’s where things get interesting—autoimmune thyroid dysfunction doesn’t just emerge from nowhere. It is often triggered or exacerbated by gut dysbiosis and chronic inflammation.
Managing autoimmune thyroid conditions requires addressing the root cause of immune system dysregulation, and gut health plays a major role in this process. Nearly 70% of the immune system resides in the gut, meaning disturbances in gut microbiota can contribute to inflammation and autoimmune activity. Leaky gut (intestinal permeability), commonly found in those with Hashimoto’s, allows undigested food particles and toxins to enter the bloodstream, triggering an immune response against the thyroid. Healing the gut through an anti-inflammatory diet, reducing gluten and dairy (which can mimic thyroid proteins), and incorporating gut-supportive foods like bone broth, fermented vegetables, and prebiotic fiber, can help reduce thyroid antibodies and improve hormone function. Additionally, balancing gut bacteria—increasing beneficial strains like Lactobacillus and Bifidobacteria—has been shown to support thyroid hormone conversion and reduce systemic inflammation.
So where does yoga fit into all of this? Yoga and other mind-body practices are powerful tools for regulating the nervous system, lowering inflammation, and reducing stress—a major trigger for autoimmune thyroid dysfunction. Chronic stress activates the hypothalamic-pituitary-adrenal (HPA) axis, which, over time, disrupts the hypothalamic-pituitary-thyroid (HPT) axis, leading to impaired thyroid function, poor hormone conversion, and increased autoimmune activity. Through breathwork, movement, and mindfulness, yoga helps shift the body into a parasympathetic (rest-and-digest) state, promoting better immune regulation, improved gut function, and enhanced neurotransmitter balance.