If there is headache and blood vomiting, it indicates critical condition and the cause should be quickly clarified as follows: 1. Acute stroke: look at the order of headache and bleeding, if it is headache first and then blood vomiting, mostly consider acute stroke, such as brain hemorrhage, large brain infarction, brain hernia, brain edema, etc. caused by large secretion of gastric acid, as well as stress erosion and ulceration of gastric mucosa, which leads to gastrointestinal bleeding. 2. Various acute and chronic gastrointestinal Diseases: If blood is vomited first followed by headache, it may be various acute and chronic gastrointestinal diseases, such as acute erosive gastritis, gastric ulcer, duodenal ulcer, ruptured esophagus-fundus varices, gastric cancer and many other diseases, which may also result in gastrointestinal hemorrhage, and the patient will have dizziness, headache and other uncomfortable symptoms. Therefore, when headache and blood vomiting occur, it is important to immediately seek medical attention, give systematic examination and give comprehensive treatment under the guidance of a doctor to prevent delays.