Published 15 Sep 2026 · Updated 30 Sep 2026 · 6 min read
Thyroid problems are common — especially hypothyroidism — and can cause a wide range of symptoms. Here's how the thyroid works, the difference between underactive and overactive thyroid, what the tests mean, and how it's treated.
Thyroid problems are common — especially hypothyroidism — and can cause a wide range of symptoms. Here's how the thyroid works, the difference between underactive and overactive thyroid, what the tests mean, and how it's treated.
The thyroid is a small, butterfly-shaped gland in the front of the neck. It produces hormones — mainly T4 (thyroxine) and T3 (triiodothyronine) — that regulate:
Many organs depend on thyroid hormones, which is why an imbalance can cause symptoms across the body.
Thyroid disorders are widespread — studies across eight Indian cities found them in roughly 11% of urban adults, with women around three times more likely to be affected than men (Indian Journal of Case Reports and Reviews 2024). Most cases are underactive thyroid, so it's worth taking symptoms seriously rather than dismissing them as tiredness or stress.
The thyroid doesn't produce enough hormone, slowing the body down.
Hashimoto's thyroiditis, an autoimmune condition where the immune system attacks the thyroid. This often runs in families and is more common in women. Other causes: iodine deficiency (less common where salt is iodised), thyroid surgery, or radiation.
The thyroid produces too much hormone, speeding the body up.
Graves' disease, an autoimmune condition. Other causes: thyroid nodules (toxic nodules) or too much thyroid hormone medication.
Your doctor interprets these together with your symptoms and history. TSH is included in most full-body health check-ups in India, and can also be booked as a standalone test (typically a few hundred rupees) with home sample collection (American Thyroid Association).
Important: reference ranges differ between labs, and a slight change in a single lab value isn't always disease. Mild elevation of TSH without symptoms (subclinical hypothyroidism) is common, and the decision to treat depends on the level and your situation — not just the number. Always read your result against your lab's printed range.
Treatment depends on cause:
Important: hyperthyroidism is serious if untreated (it can affect the heart). Treatment decisions should be made with an endocrinologist.
Thyroid health matters during pregnancy because the baby's early development depends on thyroid hormone. Women with known thyroid disease or symptoms should have TSH checked before and during pregnancy. Indian guidance (FOGSI) recommends testing in pregnancy and aiming for a tight TSH target in the first trimester.
International guidance evolves. The American Thyroid Association's 2026 update moved the first-trimester upper TSH limit to about 4.0 mU/L when no lab-specific range exists (replacing the older 2.5 limit), and no longer routinely recommends levothyroxine for women with thyroid antibodies but normal thyroid function who have infertility or recurrent miscarriage — because recent trials showed no benefit (ATA 2026 pregnancy guidelines). Indian labs and FOGSI have not adopted the new threshold yet, so always follow your doctor's and your lab's current ranges. Thyroid dosing in pregnancy is managed by a doctor, never self-adjusted.
See a doctor if you have persistent:
If you're already on thyroid medication, see a doctor for regular monitoring and dose checks — don't adjust your own dose.
This article is for educational purposes only. Thyroid conditions need proper diagnosis and treatment by a doctor or endocrinologist. This information is not a substitute for professional medical advice.
This information is for general guidance only and is not medical advice. Always consult a qualified doctor about tests, diagnosis and treatment.