There are many causes of drowsiness, the common causes are mainly the following: 1, cerebrovascular disease, such as cerebral artery insufficiency, cerebral hemorrhage, large cerebral infarction and other diseases, will cause brain dysfunction, ischemia, hypoxia, thus causing drowsiness, even coma and other conditions, need to improve the head examination to clarify the diagnosis, according to the specific cause to take targeted treatment. 2, anemia, the disease is caused by drowsiness and weakness, one of the common diseases, but also accompanied by pale face, memory loss, dizziness and other symptoms. The diagnosis of hypothyroidism can be clarified by improving the routine blood test, which requires active iron supplementation, as well as consuming more red dates and animal offal. 3. Diagnosis, taking thyroxine tablets can effectively relieve symptoms.