Insufficient oxygen supply to the brain can be characterized by dizziness, fatigue, dozing, lightheadedness, numbness of the limbs, nausea, vomiting, black haze, memory and computational impairment. Common causes of insufficient oxygen supply to the brain include carotid atherosclerosis, cervical spondylosis, hypertension, hypotension, hyperlipidemia, anemia, diabetes mellitus, intracranial space-occupying lesions, tension and anxiety. After various factors lead to insufficient blood supply and oxygen supply to the brain, symptoms such as dizziness, fatigue, drowsiness, lightheadedness, numbness of limbs, nausea, vomiting, black haze, and loss of memory and computation power can occur. The cause can be determined by neck ultrasound, lipids, blood glucose, blood tests, blood pressure, cranial CT or MRI. Treatments include anti-platelet aggregation, lowering sugar, regulating lipids and stabilizing plaque, smoothing blood pressure, preventing atherosclerosis, psychological counseling and surgical treatment. If there is any discomfort, it is recommended that patients go to the Department of Neurology of regular hospitals for consultation and treatment, and should not blindly treat themselves to avoid delaying their condition.