There are many reasons for headache and vomiting, and the common clinical causes are as follows: 1. Gastrointestinal flu, which is a very common cause of headache, dizziness, nausea and vomiting, mainly due to the constriction of blood vessels in the head and the stasis of blood in the gastrointestinal tract. 2. Hypertensive encephalopathy, a sharp increase in blood pressure within a short period of time, which can lead to headache, dizziness, dizziness, nausea, vomiting and other symptoms. 3. The stimulation of alcohol can cause headache, dizziness, nausea, vomiting and abdominal distension.4. Insomnia is also a common cause of head discomfort and gastrointestinal reactions.5. Cerebral hemorrhage, which is the most serious cause of headache and nausea and vomiting, has a rapid onset, heavy symptoms and rapid progression, often causing coma and hemiparesis, and most patients require surgery. In addition, fever, staying up late, menstrual disorders, anxiety, depression and other causes can also cause dizziness, headache, as well as nausea, vomiting and other symptoms.