If the patient suddenly appears dizzy and vomits blood at the same time, accompanied by blurred vision, impaired movement of the limbs and other manifestations of increased intracranial pressure, in serious cases can be life-threatening, you should immediately call the emergency number to the hospital. In addition, vomiting blood may also be caused by gastrointestinal bleeding, if a patient vomits blood > 100ml, or vomits blood > 500ml within 24 hours, the situation should not be ignored, it is also recommended to seek medical treatment in a timely manner: 1, acute attack of cerebral infarction: refers to the sudden appearance of cerebral blood circulation disorders, resulting in cerebral tissue ischemia and hypoxia, clinical manifestations mainly include sudden dizziness, impaired physical activity The clinical manifestations mainly include sudden dizziness, impairment of body movement, speech and intellectual impairment, etc. It can also cause the appearance of stress ulcers and cause gastrointestinal bleeding, and then the symptoms of blood spitting and dizziness occur simultaneously. After the attack, the patient should first be kept lying down and the head should be tilted to the side to avoid choking on blood and causing respiratory distress. 2. Gastrointestinal bleeding: Acute gastric mucosal lesions, gastric ulcers, ruptured esophagus-fundus varices and other diseases may cause gastrointestinal bleeding, which may lead to symptoms of vomiting blood. If the amount of bleeding is high, the blood volume of the whole body may drop, causing a decrease in blood pressure, dizziness and even shock. Patients are advised to stay in a supine or semi-sitting position and go to the hospital on their own if conditions permit, or call the emergency number immediately.