The possible causes of frequent headaches, dizziness, and drowsiness are cerebral artery blood supply deficiency, sleep disorders, cerebral organic diseases, and mental illnesses, as follows: 1. cerebral artery blood supply deficiency: the most common, cerebral artery blood supply deficiency is mainly seen in middle-aged and elderly friends, who generally have hypertension, diabetes, hyperlipidemia, and obesity, and these patients can develop cerebral arteriosclerosis due to chronic diseases, and therefore can have cerebral Arterial insufficiency of blood supply symptoms; 2, sleep disorders: long-term night sleep, poor sleep quality, sleep difficulties, early awakening patients can appear the above symptoms; 3, organic brain disease: such as cerebral infarction, intracranial tumors, patients can also appear the above phenomenon; 4, mental illness: anxiety, depression disorders patients can also appear somatization symptoms, the most common is headache, dizziness, dizziness and other phenomena.