If you wake up with headache and nausea, you need to be alert to the following diseases: 1. Malignant hypertension: Patients often wake up in the morning and their blood pressure rises sharply. 2. Hypoxia: If the room is not ventilated or if there is sputum monoxide poisoning and other conditions, patients will wake up with severe headache, nausea, vomiting and other phenomena. 3. Food poisoning: Eating an unclean diet can also 4. cerebrovascular disease: cerebral hemorrhage, subarachnoid hemorrhage, can suddenly appear headache, nausea, vomiting and other phenomena. The cause of headache and nausea is complicated, so you need to go to the neurology department of the hospital and make a clear diagnosis by doing relevant auxiliary examinations.