Leukemia vomiting blood means that leukemia is associated with upper gastrointestinal bleeding or internal bleeding, and the condition is relatively serious. Leukemia is a class of malignant clonal disease of hematopoietic stem cells, which can be characterized by anemia, bleeding, and infection. Bleeding can occur in all parts of the body, common skin petechiae, nosebleeds, gum bleeding, excessive menstruation in women, etc. These bleeding symptoms are usually mild, and the bleeding can be controlled with hemostatic treatment. If there is vomiting of blood, it means that the patient is accompanied by gastrointestinal bleeding, which is rare, but the condition is more serious, and can cause hemorrhagic shock, coma and other symptoms, and even affect the effect of treatment and survival time. Therefore, once leukemia patients are diagnosed, they should actively standardize their treatment and undergo regular review to prevent their condition from progressing and deteriorating.