Head swelling, nausea and vomiting may be caused by gastrointestinal flu, high blood pressure, cerebral infarction and other diseases. 1. Gastrointestinal cold: Gastrointestinal cold is a gastrointestinal dysfunction caused by viruses, which manifests itself as fever, loss of appetite, nausea, vomiting, etc., and some patients may also suffer from bloating, headache and other symptoms. 2. Hypertension: Hypertension means that the pressure value of flowing blood on the wall of blood vessels is persistently higher than normal. The causes of the disease have not been clearly defined, including heredity, age, bad habits, as well as renal disease, endocrine disease, and so on. Patients will experience symptoms such as head swelling and pain, dizziness, etc. If the blood pressure is too high, nausea and the urge to vomit will occur. 3. Cerebral infarction: cerebral infarction refers to limited ischemic necrosis or softening of brain tissues, which is caused by the obstacle of cerebral blood circulation and tissue ischemia, hypoxia, patients will have headache, head swelling, nausea, vomiting and other symptoms, and it may also be manifested as one side of the limbs numbness and other manifestations. There are many reasons for head swelling, nausea and vomiting, so patients are advised to consult a doctor for a clear diagnosis.