Chronic distension of the head is caused by the following reasons: 1. chronic cerebral artery insufficiency, long-term atherosclerosis will cause cerebral artery stenosis, resulting in reduced cerebral blood flow, the patient can appear head dizziness and ischemic symptoms. 2. long-term insomnia, insomnia is also a common cause of head dizziness and discomfort, mostly seen in middle-aged and elderly people. 3. sleep apnea syndrome, the disease is due to the patient’s severe nighttime 4, somatization disorders, including anxiety and depression, neurosis, plant nerve dysfunction, and so on. These patients do not have organic diseases, but have symptoms such as head swelling and discomfort caused by mental and psychological factors.