The main symptoms of hypothyroidism include fear of cold, depressed mood, memory loss, slow heart rate, mucous edema of the skin and dry skin. If the disease develops in infancy, it may be characterized by low intellectual development and short stature. Since hypothyroidism is caused by a decrease in the synthesis or secretion of thyroid hormones, the treatment is to supplement thyroid hormones. 1. Main symptoms: Decrease in basal metabolic rate leads to fear of cold, loss of appetite, abdominal distension; lack of thyroid hormone in infancy leads to the development of the nervous system, as well as bone formation and bone resorption are affected, which manifests as mental retardation and short stature. In addition, there are symptoms such as slow heart rate, shortness of breath, dyspnea, mucous edema of the skin and dry skin. 2. Treatment: Oral levothyroxine tablets are the most basic treatment. However, there are many reasons for hypothyroidism, such as primary hypothyroidism, pituitary tumor, Hashimoto’s thyroiditis and so on. Therefore, it is necessary to find the cause of hypothyroidism and correct the cause of the disease, such as pituitary tumor, pituitary tumor resection. Hypothyroidism needs to go to the hospital, according to the thyroid function situation to adjust the medication.