If the child vomits blood if the amount is not much, focus on whether it is nasal bleeding, because nasal bleeding can flow back into the throat, stimulation caused by vomiting blood, but also pay attention to whether there is bleeding in the mouth, gum area, some children have tonsil inflammation, there may also be bleeding. If the child has a chronic disease of the digestive tract, such as chronic esophagitis, ulcers and other conditions, the common cause of vomiting blood should also pay attention to the bleeding of the stomach or esophageal mucosa. Of course, if the child’s condition is very serious, especially if he or she has a lung condition and bleeding inside the lungs, the child can also experience an increase in blood inside the digestive tract causing vomiting of blood. In conclusion, no matter what the cause of a child’s vomiting blood, it is important to go to the hospital to see a pediatric emergency, conduct a detailed physical examination, do the appropriate auxiliary examinations and imaging tests, assess the condition, find the cause of the vomiting blood, and then actively deal with the cause of the treatment.