Symptoms of hypothyroidism include chills, fatigue, slow heart rate, etc. The main indicators include TSH, T3, T4, FT3, FT4. Common symptoms of hypothyroidism include: chills, fatigue, dull expression, slow reaction, hoarseness, dry and rough skin, swelling of hands and feet, facial eyelid edema, slow heart rate, constipation, menstrual disorders, and weight gain. Thyroid function tests include TSH (thyroid stimulating hormone), total T3 (total triiodothyronine), total T4 (total thyroxine), FT3 (free triiodothyronine), FT4 (free thyroxine). an increase in TSH and a decrease in T3, T4, FT3, FT4 suggests hypothyroidism. Patients with suspected hypothyroidism are advised to seek prompt medical attention.