Hypothyroidism and everyday headaches: what to know

An underactive thyroid slows several body processes and may be accompanied by tiredness, sleepiness, constipation, feeling unusually cold, dry skin, or a hoarse voice. A headache may also be influenced by dehydration, missed meals, poor sleep, eye strain, medication overuse, stress, or migraine. These possibilities can overlap, so the timing matters: note when the pain began, where it is felt, how long it lasts, and whether it changes with thyroid treatment.

A clinician may review your symptoms and medicines and arrange thyroid blood tests when appropriate. Headache symptoms do not prove that thyroid function is abnormal.

Keep a brief headache diary recording sleep, meals, fluids, screen time, triggers, pain location, and any nausea or light sensitivity. Take prescribed thyroid medicine exactly as directed and avoid changing the dose based on headache symptoms. Regular meals, adequate fluids, gentle activity, and a consistent sleep routine can reduce common triggers. If you use painkillers often, ask a clinician or pharmacist whether they could be contributing to repeated headaches.

Arrange a medical review if headaches are new, becoming more frequent, lasting longer, or affecting work, sleep, or daily activities, especially with other symptoms of hypothyroidism such as marked fatigue or generalised weakness. Seek urgent help for a sudden severe headache, new weakness or numbness, confusion, fainting, trouble speaking, vision loss, fever with a stiff neck, or repeated vomiting.

Could thyroid testing help explain my symptoms? Which headache features should I track? Could any of my medicines or supplements be contributing? What pain relief is suitable for me?