Conversation: The conversation between human and AI assistant.
[|Human|] Hi Doctor My Son is 3 years old. Somtimes he complains about pain in his leg (left leg currently) and he can t straigten his leg and can t walk properly. It happened twice in last six months and we went to doctors including sepcialists but after all the tests they didn t find anything. This morning he complained again and we also noticed little swelling around his kee. It goes by it self sometimes in few hours and sometimes in couple of days. We are very worried and want to know how should we go about it.
[|AI|]  Hi, Is the overlying skin hot/red? A sudden onset of pain and swelling over knees along with limping and difficulty in straightening indicates acute arthritis. Kindly take him to doctor, as this need immediate evaluation to rule out septic arthritis (bacterial infection of the joint cavity) which needs rapid treatment with antibiotics. If the same features are recurring, we need to evaluate for causes of recurrent arthritis. Since I am not aware of previous investigations done, your pediatrician will guide you. Hope I have answered your question. Let me know if I can assist you further.