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Hypothyroidism
An underactive thyroid gland
The thyroid controls how fast your body uses energy. When it is underactive, everything can feel slower—energy drops, weight may increase, and mood can flatten. Symptoms often build up gradually.
What you should know
- Common causes include autoimmune thyroid disease and past thyroid treatment.
- More frequent in women, especially after pregnancy or with age.
- Diagnosis is usually confirmed with a TSH blood test.
Symptoms people often report
- Ongoing fatigue
- Feeling cold when others feel comfortable
- Dry skin or brittle hair
- Constipation
- Low mood or poor concentration
Practical next steps
Ask your doctor for a thyroid function test if these symptoms persist. Do not start thyroid medication on your own—dosing needs medical supervision.