How common is fatigue in hypothyroidism?

When the thyroid produces too little hormone, body processes can slow. This may cause tiredness, feeling cold, constipation, dry skin, low mood, muscle aches, slower thinking, or changes in menstrual bleeding. Fatigue may build gradually and can be mistaken for stress or poor sleep. It is not specific to hypothyroidism, so the symptom alone cannot diagnose a thyroid problem.

Make an appointment if tiredness persists, keeps returning, or is paired with cold intolerance, constipation, skin changes, or unexplained weight change. Thyroid blood tests help assess the cause, and a clinician may also check blood counts, sleep, mood, and medicines. Keep a note of symptoms and when they started. Take prescribed thyroid medicine exactly as directed; ask before changing the dose, timing, or supplements because some products affect absorption.

Seek urgent care for severe drowsiness, confusion, fainting, chest pain, difficulty breathing, or a marked drop in body temperature. Contact your clinician promptly if weakness is rapidly worsening, you cannot manage usual activities, or fatigue follows a thyroid medicine change.

Ask which thyroid tests are appropriate, when results should be reviewed, and whether another condition could be contributing. Discuss medicine timing, interactions with iron or calcium supplements, and how to recognise a dose that needs review.