Bleeding gums in children are not necessarily a precursor to leukemia. Bleeding gums in children are mainly caused by periodontal lesions and improper handling, while children with leukemia may also have bleeding gums. There are more reasons for children’s gum bleeding, such as the gums of young children are more delicate, incorrect brushing posture, which can lead to gum bleeding; or the presence of dental calculus, which can also easily cause gum bleeding. In addition, gum bleeding can also occur when a child has thrombocytopenia, but there are more causes of thrombocytopenia, and leukemia is only one of them. However, if the patient is accompanied by abnormal bleeding from other parts of the body, such as pinpoint blood spots on the skin mucosa, or recurrent fever of unknown origin, swollen lymph nodes in the neck or armpits, etc., this should be taken seriously and may also be a precursor of leukemia. When children have bleeding gums, they need to go to the stomatology or hematology departments of regular hospitals promptly. If there are suspected symptoms of leukemia, the diagnosis can be clarified through blood tests and bone marrow smears, so that the appropriate treatment can be given.