Hypothyroidism is hypothyroidism, which refers to the disease caused by reduced synthesis and secretion of thyroid hormones or weakening of their effects. Clinical symptoms include fear of cold, slow heart rate, hypogonadism, etc. It is recommended to follow the doctor’s instructions for treatment. 1. Low metabolism syndrome: Low metabolism caused by insufficient thyroid hormones is often manifested as chills and fatigue. Slow metabolism with low calorie consumption, patients may also suffer from loss of appetite and abdominal bloating. Due to the deposition of mucin in the body, it may lead to mucous edema and there will be weight gain. 2. Cardiac system: hypothyroidism can lead to low metabolism, affecting the blood supply function of the heart, so there is a slow heart rate, and in serious cases, it can cause heart disease, such as pericardial effusion. 3. Reproductive system: Hypothyroidism usually causes endocrine system abnormalities, leading to menstrual disorders in women, early manifestations of excessive menstruation, long-term untreated may lead to amenorrhea and infertility. Male patients may experience impotence and loss of libido. In addition, loss of appetite may also occur. When the above symptoms occur, it is recommended to consult a doctor for further examination, to clarify the cause with the help of the doctor, and to carry out targeted treatment or therapy.