Headache is a common symptom, and there are many diseases that cause headache. The common diseases are: 1. neurological headache, most of the neurological headache is caused by excessive mental stress and excessive mood, and there is no organic lesion. Common diseases include neurasthenia, trigeminal neuralgia, etc.; 2. Intracranial lesions, such as cerebral hemorrhage, cerebral infarction, brain tumor, encephalitis, etc. The common symptom is headache, which can be accompanied by symptoms such as difficulty in moving the limbs, and encephalitis can appear with fever and headache; 3. Respiratory diseases, such as sinusitis and pneumonia causing fever symptoms. The main clinical symptoms of sinusitis are nasal congestion, runny nose, headache, etc.; 4. Bronchitis, heat stroke, hypertension, leukemia, cerebrovascular spasm, insomnia, acute upper respiratory tract infection, brain roundworm can cause headache, it is best to check the blood routine, blood pressure, body temperature, etc. at the hospital to further confirm the diagnosis.