A splitting headache in the morning indicates that the headache is very severe. The most common type of splitting headache is subarachnoid hemorrhage, which can be accompanied by sudden severe headache, nausea, vomiting and positive meningeal irritation signs. Cluster headache may also appear as a splitting headache. Cluster headache is a severe pain around the orbit on one side of the eyes, accompanied by congestion and tearing of the eyes and other vegetative manifestations, and the patient has pain at the same time every day, for example, every time he or she gets up in the morning with severe, continuous pain, even for weeks or months. If patients have this feature, they must go to a professional medical institution for consultation. In this case, it is highly suspected that the headache is caused by intracranial occupying lesions; 6. It is related to some bad habits and behaviors, such as excessive drinking at night and severe headache the next day.