Thyroid Disorder Guide: Symptoms, Testing & Treatment in Malaysia

The thyroid is a butterfly-shaped gland in the front of your neck that produces hormones — primarily thyroxine (T4) and triiodothyronine (T3) — which regulate your body's metabolic rate. Almost every cell in the body is influenced by thyroid hormones. They control how fast your heart beats, how quickly you burn calories, your body temperature, mood, bowel function, menstrual cycle, and energy levels. The pituitary gland in your brain monitors thyroid hormone levels and releases Thyroid Stimulating Hormone (TSH) to signal the thyroid to produce more or less hormone. When the thyroid is underactive (hypothyroidism), TSH rises trying to stimulate more production. When the thyroid is overactive (hyperthyroidism), TSH falls to suppress stimulation. Thyroid disorders are extremely common in Malaysia — studies suggest up to 10% of the adult population may have some degree of thyroid dysfunction, with women 5 to 8 times more likely to be affected than men. Autoimmune conditions like Hashimoto's thyroiditis (leading to hypothyroidism) and Graves' disease (causing hyperthyroidism) are the most common causes in the Malaysian population. Iodine deficiency, once a major cause of goitre and hypothyroidism, is less common since the introduction of iodised salt in Malaysia, but nutritional factors and environmental influences still play a role.

Hyperthyroidism means the thyroid is producing too much hormone, speeding up bodily processes. Graves' disease — an autoimmune condition — is the most common cause in Malaysia. Symptoms of hyperthyroidism: - Unexplained weight loss despite increased appetite - Rapid or irregular heartbeat (palpitations) - Anxiety, nervousness, irritability, and restlessness - Heat intolerance and excessive sweating - Tremor in the hands - Frequent bowel movements or diarrhoea - Insomnia and fatigue paradoxically - Enlarged thyroid (goitre) visible as a neck swelling - Bulging eyes (exophthalmos) — specific to Graves' disease - Muscle weakness - Light or missed menstrual periods Untreated hyperthyroidism carries serious risks including atrial fibrillation (irregular heart rhythm), osteoporosis, and in severe cases, thyroid storm — a life-threatening emergency. Treatment options include anti-thyroid medications (carbimazole or propylthiouracil), radioactive iodine therapy, or thyroid surgery. The choice depends on severity, cause, patient age, and plans for pregnancy. Beta-blockers may be prescribed early to manage rapid heart rate and tremor while thyroid hormone levels are brought under control.

A thyroid nodule is a lump within the thyroid gland. They are extremely common — ultrasound studies find nodules in 20 to 76% of adults. The vast majority (over 95%) are benign. However, a small percentage are malignant, making evaluation important. Goitre refers to an enlarged thyroid gland. It can be diffuse (the whole gland is enlarged) or nodular. Causes include iodine deficiency, autoimmune disease, and thyroid nodules. Evaluation of a thyroid nodule typically involves: 1. Thyroid function tests (TSH, T4) to determine if the nodule is affecting hormone production 2. Thyroid ultrasound to characterise the nodule — size, composition (solid vs cystic), and features suggesting malignancy 3. Fine Needle Aspiration Biopsy (FNAB) if the ultrasound shows suspicious features Thyroid cancer in Malaysia has been increasing in incidence, possibly due to improved detection. Papillary thyroid cancer — the most common type — has an excellent prognosis when detected early, with a 10-year survival rate above 95%. Risk factors for thyroid cancer: female sex, age 30 to 60, family history, previous radiation exposure to the neck, and certain genetic syndromes. At Klinik Muhibbah, we can perform thyroid blood tests and arrange referral for thyroid ultrasound if clinically indicated. Contact us at +60 7-251 1162 if you have noticed a neck swelling, have thyroid symptoms, or have a family history of thyroid disease. Hours: Mon–Thu & Sat 9AM–9PM, Fri 9AM–3PM, Sun 9AM–1PM.