There are many reasons for the body to be particularly tired, and the common causes are mainly the following: First, cerebral artery blood supply deficiency, which causes chronic lack of oxygen to the brain due to insufficient supply of cerebral blood circulation, thus causing dizziness, fatigue, mental lethargy, etc. The symptoms can be improved by taking thromboxane soft capsule, Chuanxiongzin and other drugs. Second, fatigue syndrome, with chronic fatigue as the main characteristic performance, mostly seen in patients with high mental stress and disorderly work and rest, does not require excessive treatment, and can be improved by adequate rest and appropriate functional exercise. Third, hypothyroidism, due to insufficient secretion of thyroid hormones, mainly manifested as emotional indifference, fatigue and weakness, etc. The diagnosis can be clarified by perfecting thyroid hormone measurement, and the symptoms can be improved by actively supplementing thyroxine tablets.