This is also clinically called drowsiness, is one of the common clinical symptoms, caused by a number of common causes are mainly the following: 1, fatigue syndrome, the disease is mostly seen in patients with introverted personality, emotional anxiety, rest and rest disorders, is characterized by chronic fatigue as a clinical manifestation, improve the relevant examination is often no physical organism lesions, its treatment is mainly through adequate rest, appropriate exercise to regulate, 2, cerebral arterial blood supply deficiency, the disease is due to atherosclerosis caused by the decline in vascular elasticity, blood vessel wall thickening, resulting in the relative narrowing of blood vessels, blood flow decreased, causing cerebral ischemia, hypoxia, dizziness, drowsiness, weakness and other symptoms, taking ginkgo biloba, Chuanxiong Zin and other drugs can effectively relieve the symptoms. 3, iron deficiency anemia, the disease is due to peripheral blood red blood cells decreased, resulting in This disease is caused by a decrease in the body’s oxygen-carrying capacity, resulting in cerebral ischemia and hypoxia, with symptoms such as pallor, fatigue, drowsiness, and weakness, etc. The diagnosis can be made by perfecting routine blood tests, and its treatment is mainly to actively supplement iron.