3-year-old girl wandering joint swelling and pain may be caused by growing pains, this time no special treatment; may also be caused by rheumatoid arthritis, mainly using drug treatment. 1. Growing pains: pain occurs in the lower limbs, especially at night or sleep, like massage, no local redness and swelling. No special treatment is needed at this time. In daily life, parents need to pay attention to the child’s diet, pay attention to nutritional balance, supplemental calcium and vitamin D and so on. 2. Rheumatoid arthritis: it is mostly caused by group A type B hemolytic streptococcus, which may cause pain and swelling of joints, mainly in large joints such as knees, ankles, elbows, wrists, etc. In this case, it is necessary to pay attention to bed rest and follow the instructions of the doctor. At this time, we need to pay attention to bed rest, follow the doctor’s instructions to use penicillin, erythromycin and other drugs to treat the cause of the disease. The above medications should be used under medical supervision, avoid self-medication.There are many other reasons why a 3 year old child may have migratory joint swelling and pain, and it is recommended that he or she be seen by a specialist for evaluation and treatment.