Rheumatologic problems are not uncommon in children. They can present a wide variety of musculoskeletal complaints. Some of these are self-limiting, whereas others are chronic, distressing, and can be life-threatening too. Children are not just miniature adults, and their problems need expertise in diagnosis as well as management. Unfortunately, we have very few pediatric rheumatologists in India. Sports injuries are common in children. A nontraumatic swelling of the joint in a child can be due to idiopathic arthritis, septic arthritis, rheumatic fever, inflammatory connective tissue diseases such as systemic lupus erythematosus, or cancers such as acute leukemia.