What does unintentional weight loss feel like with hyperthyroidism?

You may notice looser clothes, reduced muscle strength, heat intolerance, sweating, a fast or pounding heartbeat, shakiness, anxiety, frequent bowel movements, or difficulty sleeping. Hyperthyroidism speeds up several body processes, so weight can fall even when hunger remains the same or increases. Symptoms can build gradually and may be mistaken for stress or a busy period.

Weight loss alone does not establish hyperthyroidism. Other thyroid conditions, digestive illness, infection, medicines, and changes in food intake can produce similar effects.

Book a medical appointment if weight is falling without intending it, particularly with palpitations, tremor, heat intolerance, sweating, diarrhoea, or muscle weakness. Note your appetite, heartbeat symptoms, bowel pattern, sleep, medicines, and weight trend. A clinician may examine your pulse and thyroid and arrange blood tests to assess thyroid function. Do not change thyroid medicine without medical advice.

Seek urgent help for chest pain, severe breathlessness, fainting, confusion, a very rapid or irregular heartbeat, or sudden severe worsening with fever. Contact a clinician promptly when palpitations persist, weakness interferes with walking, or weight continues to fall. These symptoms need assessment because untreated thyroid overactivity can strain the heart and other body systems.

Could thyroid overactivity explain my weight change and heartbeat symptoms? Which thyroid blood tests are needed? Could any medicine or supplement be contributing? What changes should prompt urgent care?