There are many causes of fatigue and drowsiness, the common causes are mainly the following: 1, cerebral artery blood supply deficiency, the disease refers to the brain blood circulation disorders, causing cerebral tissue ischemia, necrosis, resulting in cerebral ischemia, hypoxia, easy to fatigue, drowsiness, dizziness and other symptoms, taking drugs such as ginkgo biloba can symptomatically relieve symptoms; 2, after frequent seizures, the disease is caused by abnormal neuronal discharge. Frequent seizures can lead to brain tissue damage, brain ischemia and hypoxia can also easily cause symptoms of fatigue and drowsiness, according to clinical manifestations and EEG examination can be clearly diagnosed, and its treatment requires regular use of antiepileptic drugs; 3, iron deficiency anemia, the disease refers to a decrease in peripheral blood red blood cells, the body’s ability to carry oxygen caused by brain ischemia, hypoxia, resulting in fatigue, drowsiness, weakness, pallor and other symptoms, perfect blood routine The diagnosis can be clarified by improving blood tests, and its treatment is mainly to actively supplement iron.