Under normal circumstances, high blood pressure does not result in vomiting of blood. However, in relatively severe hypertension, with grade 3 hypertension or higher, high pressure >180mmHg, low pressure >120mmHg or higher, malignant hypertension, blood pressure crisis, resulting in hypertensive encephalopathy, patients will have symptoms of increased intracranial pressure, and will have a severe headache with jet, accompanied by vomiting, which can lead to damage to the mucosa of the digestive tract if the patient vomits more. Especially for patients with previous chronic gastric or duodenal ulcers and previous history of upper gastrointestinal bleeding, vomiting of blood will occur, which is an abnormally high blood pressure, causing an acute cerebrovascular attack, resulting in stress ulcers and vomiting of blood. At this time, antihypertensive drugs must be applied quickly, but to keep the blood pressure smoothly down low.