Headache is the most common clinical symptom, and there are many reasons for patients to have headache and nausea: 1, for example, when mental tension, excessive stress, or poor sleep, it is easy to cause patients to have headache and nausea; 2, for example, when functional headache, migraine attack, patients will also have headache and nausea, but the nature of the headache is mainly expressed as one side of the head showing throbbing, throbbing-like pain; 3, if the patient continues to have headache, accompanied by gradually increasing nausea, this situation should be considered organic headache, 3. If the patient continues to have headache with gradually increasing nausea, the headache should be considered to be caused by organic headache, such as intracranial tumor or brain abscess, intracranial hematoma, etc. These diseases are often more serious and must be treated and diagnosed early.