What does unexplained weight gain feel like with hypothyroidism?

The weight change may be gradual and can feel like clothes fitting differently, puffiness, reduced energy or slower movement. Hypothyroidism can slow several body processes, so people may also notice sensitivity to cold, dry skin, constipation, muscle aches, a slower heart rate, low mood or difficulty concentrating. These features overlap with other conditions and with ordinary tiredness. Weight change alone cannot identify a thyroid problem, and some people with hypothyroidism have little change in weight.

Make a note of the timing of weight change and any changes in bowel habits, temperature tolerance, menstrual pattern, energy or medicines. Book a primary-care assessment if symptoms persist or interfere with daily life. A clinician may examine you and arrange thyroid blood tests; do not start thyroid tablets or high-dose supplements without advice. Continue prescribed treatment as directed and report new symptoms after a medicine change.

Seek urgent care for chest pain, severe breathlessness, fainting, marked confusion, extreme drowsiness or a very slow pulse with feeling seriously unwell. Arrange prompt medical review for rapidly worsening swelling, new weakness, or weight change with severe constipation or cold intolerance. For a stable pattern, routine assessment is appropriate.

Could my symptoms fit hypothyroidism or another cause? Which thyroid tests are appropriate? Could any current medicine affect my weight or energy? When should results be reviewed, and what symptoms should prompt earlier contact?