Thyroid Disorders: Recognising Hypo- and Hyperthyroidism Early
The thyroid is a small, butterfly-shaped gland sitting at the base of your neck — yet it controls almost every cell in the body. It regulates metabolism, body temperature, heart rate, mood, energy, weight and even fertility. When the thyroid produces too little or too much hormone, the effects ripple through every organ. Thyroid disorders are surprisingly common in India, especially in women, and most cases are easily diagnosed with a simple blood test and treated with daily medication. This guide explains what the thyroid does, how to recognise problems early, and how to live well with thyroid disease.
How the thyroid works
The thyroid produces two main hormones, T3 and T4, under instructions from the pituitary gland in the brain (which releases TSH — thyroid-stimulating hormone). These hormones travel through the blood and tell every cell how fast to work. When thyroid hormones are low, the body slows down; when they are high, everything speeds up.
Doctors test thyroid function with a simple blood panel: TSH, free T4 and sometimes free T3 and thyroid antibodies. A high TSH usually means an underactive thyroid (hypothyroidism); a low TSH usually means an overactive thyroid (hyperthyroidism). The test is inexpensive, requires no fasting in most cases, and gives results within a day.
Hypothyroidism: when the engine runs slow
Hypothyroidism is the most common thyroid disorder in India, affecting around one in ten adults — and women are five to eight times more likely to develop it than men. The most frequent cause is Hashimoto's thyroiditis, an autoimmune condition in which the immune system gradually attacks the thyroid. Iodine deficiency, certain medications and previous thyroid surgery are other causes.
Symptoms develop slowly over months and are easy to dismiss as 'just getting older' or 'just stress'. They include unexplained weight gain, fatigue, feeling cold all the time, dry skin and hair, hair fall, constipation, heavy or irregular periods, low mood, poor concentration, puffiness around the eyes and a slow heart rate. In children, untreated hypothyroidism affects growth and learning.
Treatment is simple, effective and lifelong: a daily tablet of levothyroxine (synthetic T4) taken on an empty stomach, 30–45 minutes before food, tea or coffee. The dose is adjusted based on TSH levels every 6–8 weeks until stable, then checked yearly. Most patients feel dramatically better within a few weeks of starting treatment.
Hyperthyroidism: when the engine races
Hyperthyroidism is less common but more dramatic. The most frequent cause is Graves' disease, another autoimmune condition. Thyroid nodules and thyroiditis can also cause it. Symptoms include unexplained weight loss despite a good appetite, racing heartbeat, palpitations, tremors, anxiety, irritability, heat intolerance, excessive sweating, frequent loose motions, scanty periods and difficulty sleeping. Some patients develop bulging eyes (Graves' ophthalmopathy) or a visibly enlarged neck (goitre).
Treatment options include anti-thyroid medications (carbimazole or methimazole), radioactive iodine therapy and, in selected cases, surgery. The choice depends on age, severity, plans for pregnancy and patient preference. Untreated hyperthyroidism can cause dangerous heart rhythm problems and weak bones, so it must never be ignored.
Thyroid and pregnancy
Thyroid hormones are crucial for the baby's brain development, especially in the first trimester before the baby's own thyroid starts working. Untreated hypothyroidism in pregnancy increases the risk of miscarriage, preterm birth and developmental delay in the child. Every pregnant woman should have her TSH checked at the first antenatal visit, and women with known thyroid disease often need a dose increase during pregnancy.
If you have thyroid disease and are planning a pregnancy, see your doctor first. With well-controlled levels, the vast majority of women have healthy pregnancies and healthy babies.
Thyroid nodules and cancer
Small lumps in the thyroid, called nodules, are very common — found in up to half of all adults on ultrasound. The reassuring news is that more than 95% are benign. A nodule is evaluated with a thyroid function test, ultrasound and, if suspicious, a fine-needle aspiration cytology (FNAC). Thyroid cancer, when it does occur, is usually one of the most treatable cancers with excellent long-term survival, especially when detected early.
Any new lump in the neck, change in voice, difficulty swallowing or rapidly growing thyroid should be evaluated promptly.
Living well with thyroid disease
A thyroid diagnosis is not a disaster — millions of people live entirely normal lives with simple daily medication. Take your tablet at the same time each day, do not skip doses, repeat blood tests as advised, and inform every new doctor about your thyroid condition. Avoid starting or stopping medication on your own based on internet advice. Eat a balanced diet with adequate iodine (use iodised salt) and selenium (one Brazil nut or a handful of sunflower seeds a day is enough).
At Dr. R B Yadav Hospital, our endocrinology team offers comprehensive thyroid evaluation, ultrasound, FNAC and long-term follow-up. If you have symptoms or a family history of thyroid disease, a single blood test could change the way you feel for the rest of your life.