Health LibraryDiseases & ConditionsHypothyroidism: Symptoms, Causes, and Treatment
Diseases & Conditions

Hypothyroidism: Symptoms, Causes, and Treatment

An underactive thyroid — common, easy to test, and treatable.

Medically reviewed
Updated 2026

Symptoms

Fatigue, cold intolerance, weight gain, dry skin, constipation, and hair thinning.

Diagnosis

A simple TSH blood test — often paired with free T4 — makes the diagnosis. Treatment is with levothyroxine (only under medical supervision).

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Milli's Health Library provides general educational information reviewed against peer-reviewed medical sources. It is not a diagnosis, prescription, or medical advice. Milli does not recommend medications. Always consult a licensed doctor before starting, stopping or changing any treatment.

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