MCR Diabetes & Eye Care · Kannur, Kerala
+91 9497 222 722

Thyroid Disorders in India: Symptoms, Tests, and Treatment of Hypothyroidism and Hyperthyroidism

Thyroid disorders are among the most common — and most commonly missed — medical conditions in India. Approximately 1 in 10 Indians has some form of thyroid dysfunction, with women affected 5-10 times more often than men. Symptoms are often vague and gradual, and the condition is frequently mistaken for stress, ageing, or normal post-pregnancy changes. Our preventive care team at MCR Diabetes & Eye Care, Kannur, explains everything you need to know about thyroid health.

The thyroid is a small butterfly-shaped gland at the front of the neck that produces hormones controlling metabolism in every cell of the body. When it produces too little hormone (hypothyroidism) or too much (hyperthyroidism), nearly every body system is affected — energy, mood, weight, heart rate, periods, fertility, hair, skin, and bowel function. The good news is that thyroid disorders are easily diagnosed with simple blood tests and effectively treated with widely available medications. Visit our preventive care service for comprehensive thyroid screening.

How the Thyroid Works

The thyroid produces two main hormones: T4 (thyroxine) and T3 (triiodothyronine). Production is regulated by TSH (thyroid stimulating hormone) from the pituitary gland in the brain. When thyroid hormone levels are low, TSH rises to stimulate production; when levels are high, TSH falls. This feedback loop normally keeps hormones tightly controlled.

Thyroid hormones control:

• Metabolic rate (how fast cells burn energy)
• Heart rate and blood pressure
• Body temperature
• Brain function and mood
• Menstrual cycles and fertility
• Bowel movements
• Cholesterol metabolism
• Hair and skin health

Hypothyroidism (Underactive Thyroid)

Hypothyroidism is by far the most common thyroid disorder, affecting about 10% of Indian adults. The thyroid produces too little hormone, slowing every body system.

Causes

• Hashimoto’s thyroiditis — autoimmune destruction; most common cause
• Iodine deficiency — historically common, less so now with iodised salt
• Postpartum thyroiditis — temporary or permanent after pregnancy
• Thyroid surgery or radioactive iodine treatment
• Certain medications — lithium, amiodarone, some cancer drugs
• Subacute thyroiditis — viral, usually self-limiting

Symptoms

• Fatigue and low energy
• Weight gain despite normal diet
• Cold intolerance
• Dry skin and hair
• Hair thinning and loss
• Constipation
• Depression or low mood
• Slow thinking and poor concentration
• Muscle aches and weakness
• Heavy or irregular periods
• Infertility or miscarriage
• Slow heart rate
• Puffy face, particularly around eyes
• Hoarse voice

Treatment

Treatment is simple and lifelong: replacement of the missing hormone with synthetic thyroxine (levothyroxine), taken once daily on an empty stomach. Brand names in India include Eltroxin, Thyronorm, and Thyrox. The dose is adjusted based on TSH every 6-8 weeks until stable, then annually.

Most patients feel substantially better within 2-4 weeks of starting treatment. Full benefits may take 2-3 months.

Hyperthyroidism (Overactive Thyroid)

Hyperthyroidism is less common but often more dramatic, affecting 1-2% of Indian adults. The thyroid produces too much hormone, speeding everything up.

Causes

• Graves’ disease — autoimmune stimulation; most common cause
• Toxic multinodular goitre — overactive nodules
• Toxic adenoma — single overactive nodule
• Thyroiditis — temporary, often after viral illness
• Excess thyroid hormone intake — over-treatment of hypothyroidism
• Pituitary tumours — rare

Symptoms

• Rapid heart rate and palpitations
• Tremor, particularly of hands
• Weight loss despite increased appetite
• Heat intolerance and sweating
• Anxiety, irritability, insomnia
• Frequent bowel movements or diarrhoea
• Hair thinning
• Muscle weakness, especially in thighs
• Irregular or absent periods
• Bulging eyes (in Graves’ disease)
• Goitre (enlarged thyroid)
• Brittle nails

Treatment

Three main options:

• Antithyroid drugs — carbimazole (Neo-Mercazole), propylthiouracil (PTU); block hormone production
• Radioactive iodine (RAI) — destroys overactive thyroid tissue
• Surgery — for large goitres, suspicion of cancer, or pregnancy

Beta blockers (propranolol, atenolol) are often added to control symptoms — heart racing, tremor, anxiety — while definitive treatment takes effect.

The Thyroid Test Panel

A complete thyroid evaluation includes several tests, each measuring a different aspect.

TSH — The Most Important Test

TSH is the most sensitive test for thyroid dysfunction. Normal range is approximately 0.4-4.5 mIU/L, though optimal is closer to 0.5-2.5. A high TSH suggests hypothyroidism; a low TSH suggests hyperthyroidism.

Free T4 and Free T3

Measure the active forms of thyroid hormone. Together with TSH, they confirm and characterise dysfunction.

Anti-TPO Antibodies

Indicate autoimmune thyroid disease (Hashimoto’s or Graves’). Positive antibodies are common and predict eventual development of thyroid dysfunction even when current levels are normal.

Thyroid Ultrasound

Used to evaluate nodules (very common, usually benign), goitres, and inflammation. Not routine for hypothyroidism alone.

Thyroid Disease and Diabetes

Thyroid disorders are 2-3 times more common in people with diabetes. Both conditions share autoimmune mechanisms and metabolic effects. Untreated hypothyroidism worsens insulin resistance and elevates cholesterol; hyperthyroidism can cause unpredictable blood sugar swings.

The American Diabetes Association recommends thyroid screening at diabetes diagnosis and periodically thereafter — particularly in type 1 diabetes, women, and those over 50.

Pregnancy and Thyroid

Thyroid dysfunction is particularly important in pregnancy because thyroid hormone is essential for foetal brain development. Untreated hypothyroidism in pregnancy is associated with miscarriage, premature birth, low birth weight, and developmental delay. TSH targets are tighter in pregnancy (under 2.5 in first trimester, under 3.0 thereafter). All pregnant women should have TSH tested at the first antenatal visit.

Thyroid Nodules

Thyroid nodules are very common, found in 30-50% of adults on ultrasound. The vast majority are benign. However, nodules larger than 1 cm, those with concerning features on ultrasound, or those associated with abnormal thyroid function may require fine-needle aspiration biopsy.

Routine ultrasound screening for thyroid nodules is not recommended — only investigation of clinically detected nodules or those discovered incidentally.

Lifestyle and Thyroid Health

While thyroid disease itself requires medical treatment, lifestyle factors support overall thyroid health:

• Iodine — adequate intake from iodised salt is essential; excess is harmful
• Selenium — supports thyroid hormone conversion; found in nuts, seeds, fish
• Vitamin D — deficiency linked to autoimmune thyroid disease
• Stress management — chronic stress can trigger autoimmune flares
• Avoid excess soy — high consumption can interfere with thyroid medication absorption
• Take medication on empty stomach — 30-60 minutes before food, particularly avoid calcium and iron supplements close to dose

Thyroid Disorders at a Glance

Frequently Asked Questions

Below are the questions our patients ask most often. If you have additional questions, our specialist team at MCR Diabetes & Eye Care, Kannur, is always available to help.

Final Takeaway: A Simple Test for a Common Condition

Thyroid disease is one of the most common medical conditions in India and one of the easiest to diagnose and treat. A single TSH blood test, done as part of an annual check-up or whenever symptoms suggest it, can detect dysfunction long before it causes lasting harm.

At MCR Diabetes & Eye Care, Kannur, we offer comprehensive thyroid evaluation and treatment as part of our preventive care service — including for women planning pregnancy, postpartum patients, and people with diabetes. If you have unexplained fatigue, weight changes, or any of the symptoms in this guide — and your last TSH was more than a year ago — book a thyroid screening today.

You May Also Find Helpful

• Annual Health Check-Up Guide
• Weight Management Strategies
• Lipid Profile Test Explained
• Type 2 Diabetes Symptoms

Tags: Thyroid · Hypothyroidism · Hyperthyroidism · TSH · Thyroid Test