What should you know about non-Graves hyperthyroidism?

The thyroid releases hormones that influence heart rate, temperature control, digestion and energy use. When hormone levels are too high, you may notice a racing or irregular heartbeat, tremor, heat intolerance, excessive sweating, diarrhoea, difficulty sleeping, feeling anxious or unexplained weight loss.

Thyroiditis can release stored hormone for a limited period and may later lead to an underactive phase. A toxic nodule or multinodular thyroid can make hormone independently. Medicines containing thyroid hormone, iodine exposure and some other medicines can also contribute. Blood tests usually include thyroid-stimulating hormone and thyroid hormones; an examination and, when needed, antibody tests or imaging help identify the cause.

Arrange a clinical review if symptoms persist or a blood test shows an overactive thyroid. Bring a list of medicines, supplements and recent scans, and mention pregnancy, heart disease or osteoporosis if relevant. Treatment depends on the cause: a temporary thyroid inflammation may need symptom relief and monitoring, while ongoing hormone production may be treated with medicine, radioactive iodine or surgery. Do not change thyroid medicine without guidance.

Limit triggers that worsen palpitations or anxiety, such as excess caffeine, and keep follow-up blood tests so treatment can be adjusted safely.

Seek urgent help for chest pain, fainting, severe breathlessness, confusion, or a very fast or irregular heartbeat. Fever with marked agitation, vomiting or worsening weakness can signal a serious escalation and needs emergency assessment. New eye pain or vision changes also deserve prompt review, even though eye involvement is more associated with Graves disease.

Which cause best fits my test results? Do I need repeat thyroid tests, an ultrasound or a nuclear scan? Is my condition expected to settle, and what symptoms should prompt an earlier review? Which treatment is suitable if I am pregnant or planning pregnancy?