The symptoms of hypothyroidism are as follows: 1. appearance changes: pale face, floating face, non-depressed edema, dry skin and weight gain; 2. neuropsychiatric system: decreased memory, inattentive thinking, slow reactions, blunted tendon reflexes, drowsiness or dementia in severe cases; 3. cardiovascular system: bradycardia, reduced cardiac output, dull heart sounds, low blood pressure; 4. The cardiovascular system: bradycardia, reduced cardiac output, dull heart sounds, low blood pressure, and pericardial effusion in severe cases; 4, motor system: weakness and lack of spirit; 5, endocrine system: excessive menstruation and amenorrhea in women; impotence and loss of libido in men; overflow of breast milk and secondary pituitary enlargement in some patients; 6, juvenile hypothyroidism: short stature, low intelligence and delayed sexual development.