The pain on the left side of the head should be considered for the following reasons: 1. It is caused by trauma to the patient. 2. It is caused by infection or tearing of the middle meningeal artery on the left side of the patient. 3. It is caused by the presence of cervical spine disease that compresses the blood vessels or nerves in the brain, resulting in pain. 4. It is caused by the presence of brain disease, such as brain atrophy, brain edema, damage to the left functional area of the brain, or brain tumors. 5. Pain caused by lack of oxygen in the brain due to sleep disorders or pain caused by exertion. It is recommended that patients should go to the hospital for early CT brain examination and early treatment. In daily life, patients should also pay attention to their living habits, go to bed early, get up early, avoid overexertion, and if necessary, surgery can be performed.