Hyperthyroidism: symptoms, testing, and treatment

It may present with palpitations, tremor, sweating, heat intolerance, anxiety, difficulty sleeping, frequent bowel movements, muscle weakness, or weight loss despite a normal or increased appetite. Blood tests confirm whether thyroid hormone levels are abnormal.

The thyroid is a gland at the front of the neck. Its hormones influence how quickly many organs work, so an excess can affect the heart, gut, muscles, skin, temperature control, mood, and menstrual cycle at the same time. A neck swelling or eye irritation may accompany certain causes.

Possible causes include an immune condition that stimulates the gland, hormone-producing thyroid nodules, thyroid inflammation, and some medicines. Symptoms overlap with anxiety, infection, heart rhythm problems, and other conditions; diagnosis therefore depends on thyroid blood tests rather than symptoms alone.

Book a clinical assessment for persistent palpitations, unexplained weight change, tremor, heat intolerance, excessive sweating, or a cluster of these symptoms. Bring a medicines and supplements list because iodine-containing products and certain prescriptions can affect the thyroid or its test results. Do not stop a prescribed medicine without advice.

Treatment is chosen according to the cause, symptom severity, other health conditions, pregnancy plans, and personal preferences. Options may include medicine that reduces hormone production, radioactive iodine, or surgery. A beta blocker may control racing heart, tremor, or anxiety-like sensations while the underlying treatment takes effect. Follow-up blood tests help adjust care and avoid thyroid hormone levels becoming too low.

Call emergency services for a very fast or irregular heartbeat with chest pain, severe breathlessness, collapse, confusion, or marked agitation. High fever with rapidly worsening thyroid symptoms can indicate a rare thyroid emergency and needs immediate hospital care.

If you take an antithyroid medicine, seek same-day medical advice for fever, sore throat, mouth ulcers, unusual bruising, or yellowing of the skin or eyes. These can signal uncommon but serious medicine effects that require a blood test and specific instructions about the next dose.

Ask what is causing the overactive thyroid, which treatment options fit your situation, and how monitoring will be arranged. Discuss eye symptoms, heart conditions, pregnancy or plans to conceive, and what to do if you miss medicine or develop fever and a sore throat.