Hyperthyroidism in teenage females: what to know

An overactive thyroid can make the body work faster. A teenager may notice palpitations, excessive sweating, heat intolerance, diarrhoea, trouble sleeping, feeling anxious, or changes in weight and appetite. Periods may become lighter, less regular, or stop, but many other conditions can cause menstrual changes. Irritability or school difficulties can also have several explanations. These symptoms are presentations of hyperthyroidism, not proof that a symptom is caused by it.

Arrange an appointment with a family doctor, paediatrician, or endocrinology team if symptoms persist, interfere with school or sport, or occur together. Bring a list of medicines and supplements and note changes in periods, sleep, bowel habits, appetite, and heartbeat. The clinician may examine the neck and eyes and order thyroid blood tests. If confirmed, treatment may include medicine and follow-up testing.

Get urgent help for fainting, chest pain, severe breathing difficulty, confusion, or a very fast or irregular heartbeat. Prompt assessment is also needed when persistent vomiting or diarrhoea causes dehydration. A teenager taking antithyroid medicine should promptly report fever or sore throat to the prescribing team.

Ask which tests are needed, whether periods or growth may be affected, how treatment will fit around school and sport, what side effects require a call, and when follow-up is planned.