Whether or not blood is vomited through the mouth in stomach bleeding depends on the amount of bleeding and the speed of bleeding. When the short-term bleeding volume is large, the blood can be vomited through the mouth, and when the bleeding volume is small and the bleeding speed is slow, there may be no symptom of vomiting blood, which is manifested as blood in the stool. 1. When the amount of short-term gastric bleeding is large, the patient may not only vomit blood through the mouth, but also have tar-colored or dark red stools. At the same time, patients may be accompanied by dizziness, panic, fatigue, fever, abdominal pain, and in severe cases, fainting. At this time, you need to go to the hospital as soon as possible to avoid delay. 2. When the bleeding volume of gastric hemorrhage is small and the bleeding speed is slow, there may be no symptom of vomiting blood through the mouth, and the symptoms may be black stool, dizziness, panic, fatigue, fever and abdominal pain. If you have stomach bleeding, it is recommended that you consult a doctor in time and have standardized treatment as soon as possible to avoid delaying the treatment.