The child’s leg pain needs to be analyzed whether it is leukemia or not according to the child’s clinical symptoms and examination results. 1. Symptoms: In addition to leg pain, it is necessary to observe whether the child has fever, bleeding, swollen lymph nodes and other manifestations, and whether other parts of the body will have pain, such as the sternum. 2. Examination results: blood routine, bone marrow puncture, X-ray of long bones of the limbs and other related examinations can be further improved, and the cause of leg pain can be further analyzed according to the examination results combined with clinical manifestations. Leukemia starts in many forms, and some children have bone and joint pain as the main symptom. However, joint pain alone is not enough to diagnose leukemia, as growing pains, juvenile idiopathic arthritis, etc., can cause pain in the lower limbs. If your child has leg pain, it is recommended that he or she seeks medical attention to determine the cause of the pain and then actively cooperates with the treatment.