Hypothyroidism is an endocrine disorder caused by insufficient secretion of thyroxine by the body’s thyroid gland. Hypothyroidism is a clinical syndrome caused by a decrease in the metabolic activity of the body and the function of various systems. It mainly affects growth and development, sexuality and fertility, cardiovascular system, gastrointestinal system, etc. 1, growth and development: hypothyroidism in children can lead to slow growth, intellectual backwardness, even dementia, short stature, etc. For adolescents, hypothyroidism is characterized by delayed growth and a few cases of precocious puberty. 2. Sexual and reproductive functions: In women, hypothyroidism can lead to excessive menstrual flow, wrong menstrual cycle, infertility, and easy miscarriage and stillbirth after pregnancy. In men, hypothyroidism can lead to loss of libido, breast development, and difficulty having children. Hypothyroidism can also be hereditary, so it is recommended that the condition be cured before having children. 3. Cardiovascular system: Patients may have enlarged heart, low heart sound, bradycardia, and increased blood pressure. 4, gastrointestinal system: Patients with hypothyroidism often have symptoms such as loss of appetite, abdominal distension, nausea, low stomach acid, and difficulty in defecation. 5, mental and emotional aspects: often fatigue and weakness, depressed mood, like to be alone, anxiety, fear of cold, fear, panic, mucus edema, weight gain, memory loss and other symptoms. Therefore, hypothyroidism has more hazards and requires patients to pay attention to timely treatment.