Conversation: The conversation between human and AI assistant.
[|Human|] About  6 weeks agao the knuckle of my thumb felt sore as if bruised. Now the thumb joint is swollen and I cant bend it without pain. I get short sharp pains from the left corner of my nail bed but everything looks okay - no infection or discoloration
[|AI|]  Hello, Thank you for using Chat Doctor. I read your question and understood your concern. I would like to know the exact place of the knuckle. Is it in the palm of the thumb or on the dorsum (back) of the thumb?. If it is the palm of the thumb the most probable diagnosis is trigger thumb syn Chat Doctor. If it is in the dorsum of the thumb might be osteoarthritis nodules or extensor tendon cyst. Your age would help me know more about diagnosis. An X-ray of the thumb would rule out the osteoarthritis option.