Constant headache can be divided into physiological and pathological, and the pathological causes mainly include brain diseases, cardiovascular diseases, mental diseases and systemic diseases. 1. Physiological: If people who have been living in the plains and other lower altitude areas for a long time come to the plateau, they will have persistent headache symptoms. Drinking alcohol or coffee and other refreshing drinks may also produce headaches. These are normal physiological phenomena, eliminating the triggers can be restored. 2. Pathological: If you suffer from brain diseases, such as meningitis, brain abscess, brain tumors and encephalitis and other brain diseases, it will lead to headaches. Cardiovascular diseases such as heart failure and hypertension can also produce this symptom. Psychiatric disorders such as depression and anxiety are also responsible for this symptom. Systemic diseases such as influenza, heat stroke, typhoid and poisoning are also causes. If the headache is suspected to be pathologic, it is advisable to seek medical attention promptly.