What should you know about pseudo hyperthyroidism?

An overactive thyroid can produce palpitations, heat intolerance, excessive sweating, diarrhoea, tremor, weight change, feeling anxious, and difficulty sleeping. Similar symptoms can follow stress, infection, medication effects, stimulant use, hormonal changes, or other illnesses. A single thyroid blood result may be affected by timing, supplements, or the body’s wider response to illness. Symptoms and test results therefore need to be interpreted together rather than treated as proof of hyperthyroidism.

Write down symptoms, their timing, changes in weight, pulse sensations, sleep, bowel pattern, sweating, and medicines or supplements. Tell the clinician about biotin or products marketed for energy, as some supplements can interfere with laboratory testing. Do not start or stop thyroid medicine without medical advice. A clinician may repeat thyroid tests, review medicines, examine the neck and pulse, and investigate another cause when results and symptoms do not match.

Seek urgent help for palpitations with chest pain, fainting, severe breathlessness, confusion, or a very fast or irregular heartbeat. Arrange prompt medical review for persistent symptoms, unexplained weight loss, marked weakness, ongoing diarrhoea, or new swelling in the neck. Bring a list of all medicines and supplements to the appointment.

Ask whether your symptoms and thyroid results agree, whether any supplement could affect testing, and when repeat tests are appropriate. Ask which symptoms should prompt urgent help and whether another condition or medicine could explain the pattern.