If a patient experiences significant headache, dizziness, and vomiting, there are usually several factors as follows: 1. The most common factor is neurological disease, such as when a patient has an acute stroke, cerebral thrombosis, cerebral infarction, cerebral hemorrhage, or TIA attack, which can cause headache accompanied by dizziness and vomiting. 2. In some hypertensive emergencies, especially in malignant hypertension when hypertensive encephalopathy occurs, the patient will experience headache and vomiting because of 3. If the patient has had severe cervical spondylosis, an acute attack of cervical spondylosis may cause headache, dizziness, and vomiting. 4. This can also occur in cases of toxic diseases such as food poisoning, drug poisoning, and poisoning by bad gases.