How common is excessive sweating in hyperthyroidism?

Sweating linked with hyperthyroidism may occur alongside heat intolerance, a fast or irregular heartbeat, tremor, anxiety, difficulty sleeping, frequent bowel movements, muscle weakness or unplanned weight loss. The pattern can be gradual. Excessive sweating alone has many possible causes, so it cannot identify a thyroid problem without an assessment.

Arrange a clinician visit if sweating persists or comes with the symptoms above. Note when it happens, changes in weight or heart rate, sleep problems and all medicines or supplements. A clinician may examine you and request thyroid blood tests before discussing treatment. Keep cool and drink to thirst while waiting for advice.

Get urgent help for chest pain, severe breathlessness, fainting, confusion, a very fast or irregular heartbeat or sudden profound weakness. A high fever with agitation or severe illness also needs immediate assessment, especially in someone known to have uncontrolled thyroid disease.

Ask whether your symptoms warrant thyroid testing, which medicines or supplements could affect sweating, and how treatment would be monitored. Tell the clinician about palpitations, tremor, weight change, eye symptoms and any history of thyroid disease.