What should you know about consequences of hyperthyroidism?

An overactive thyroid increases the body’s metabolic activity. People may experience palpitations, excessive sweating, heat intolerance, difficulty sleeping, feeling anxious, diarrhoea or night sweats. Weight loss, tremor and muscle weakness can occur even when appetite is unchanged. Persistent strain on the heart may lead to an irregular rhythm, while untreated disease can also affect bones and menstrual or reproductive health. Symptoms overlap with other conditions, so they do not establish the cause on their own.

Arrange a medical review for ongoing palpitations, unexplained weight change, tremor, sweating or heat intolerance. A clinician may assess your pulse, examine your neck and request thyroid blood tests; further checks depend on the findings. Take prescribed thyroid medicine exactly as directed and keep follow-up appointments so the dose and response can be reviewed. Tell the clinician about supplements, heart symptoms and any pregnancy plans.

Seek urgent help for chest pain, fainting, severe breathlessness, a very fast or irregular heartbeat, marked agitation, confusion, or a high temperature with worsening illness. These signs can indicate a serious complication or another emergency. Do not stop prescribed treatment without advice, because abrupt changes may allow symptoms to worsen.

Ask which thyroid test results explain your symptoms, how treatment will be monitored, whether your heart or bones need assessment, and which changes should prompt urgent contact.