In the Sushruta Samhita, compiled around 600 BCE by the surgeon and physician Sushruta, there is a classification of a condition he called galaganda. Swelling of the neck. Seven subtypes, classified by cause, appearance, and constitutional type of the patient. He described it with clinical precision: which subtypes were operable, which were not, what the dietary causes were, which geographic regions produced higher rates of the condition.
Sushruta identified that galaganda was associated with particular water sources and particular geographic environments, specifically, regions far from the sea. He prescribed dietary interventions including sea vegetables, rock salt with iodine content, and specific plant compounds. He was describing goiter, iodine-deficiency related thyroid disease. This was two and a half thousand years before the thyroid gland was named in Western medicine, and identifying the dietary cause and correction with specificity took European medicine until the 20th century to confirm.
The thyroid gland regulates metabolic rate, body temperature, energy production, and the speed of nearly every biological process. When it underproduces (hypothyroidism), the body slows: fatigue, weight gain, constipation, cold sensitivity, brain fog, hair thinning, irregular cycles. When it overproduces (hyperthyroidism), the body accelerates: anxiety, weight loss, heart palpitations, heat sensitivity, insomnia.
South Asian women have significantly elevated rates of thyroid dysfunction, both hypothyroidism (more common) and autoimmune thyroid conditions like Hashimoto's thyroiditis. The reasons are genetic, environmental, and dietary. Iodine insufficiency is one factor. Selenium insufficiency is another. Autoimmune predisposition is a third. The interaction between chronic stress and thyroid function is a fourth - cortisol directly suppresses TSH production and thyroid hormone conversion.
Normal on a blood test doesn't mean optimal. Standard thyroid panels check TSH. Many practitioners argue that a TSH in the upper end of the "normal" range (above 2.0) in a symptomatic patient warrants attention. The symptom picture; fatigue, cold hands and feet, constipation, slow metabolism, mood changes, and hair loss can predate abnormal TSH by months or years. If your bloodwork says normal and you don't feel normal, the question to push on with your doctor is whether you've been tested for T3, T4, and thyroid antibodies, not just TSH.
What Sushruta's approach would suggest: the body does not malfunction randomly. There is a cause, and the cause is specific. His diagnostic method included what's the patient eating, what's the water source, what's the environment, and the constitutional type was designed to find that cause and address it rather than manage the symptom.
In practice: selenium (found in Brazil nuts, seafood, eggs) supports thyroid hormone conversion. Adequate iodine (from iodized salt, seaweed, dairy) supports production. Reducing goitrogenic foods when eaten in large amounts raw (cruciferous vegetables, they're fine cooked). Managing chronic stress because cortisol impairs thyroid function at the hormonal level. Sleep, because thyroid hormone release follows a circadian pattern and is disrupted by poor sleep.
Sushruta didn't have an endocrinologist. He had observation, classification, and the knowledge that geography and diet determined outcomes. He was right about the mechanism. The tools are better now. The principle is the same.
