There are many causes of dizziness in the head all day long, and regardless of the disease, its pathogenesis causes dysfunction of the central nervous system. Common causes include anemia, and no matter what type of anemia, drowsiness can occur due to lack of blood and oxygen supply to the brain tissue due to ischemia and hypoxia. In addition, there are patients with cerebral arteriosclerosis, also due to cerebral arteriosclerosis, the blood flow to the brain is reduced resulting in insufficient blood supply to the brain, and head drowsiness can occur. Patients with cervical spondylosis can also experience head dizziness due to insufficient blood supply to the brain as a result of pressure on the vertebral artery. Patients with ear disease and eye disease can also affect the central nervous system, resulting in drowsiness and confusion in the head.