Insufficient blood supply to the brain is generally a manifestation of disease, usually a pathological condition caused by diseases such as cervical spondylosis, atherosclerosis or heart disease. 1. Cervical spondylosis: Cervical spondylosis can lead to misalignment of the cervical vertebrae, thus compressing the vertebral artery and leading to abnormal blood supply to the brain. 2. Atherosclerosis: when the fat metabolism of the patient is abnormal, atheromatous plaques will be produced in the carotid artery, which will gradually block the blood vessels, resulting in insufficient blood supply to the brain. 3. Heart disease: Heart disease will lead to insufficient blood supply of the heart, resulting in blood not reaching the brain smoothly, thus causing insufficient blood supply to the brain. When the patient has insufficient blood supply to the brain, it is recommended to go to the hospital in time to receive professional diagnosis from the doctor.