When I flex my right hand, I feel a bit of pain in the top joint of the middle finger. It does not always occur, but mostly when my arm is not supported. In other words, when I rest my arm on a sofa for example and flex the hand, I don't feel the pain. It started recently. I have been a fairly heavy computer user (25 years).
Well, yes, those who use computers a lot can develop arthritis of any joint of the fingers used. So if you tap the keys a lot with your middle finger, you can avoid giving too much force. You could also place your wrist in such a position that gives the least pressure on middle finger. There are many well designed computer chairs which you can use.
Meanwhile dip your hand alternatively in warm and cool water. Apply local analgesic cream. Exercise all joints of fingers and wrist by flexing and extending. Give break to your fingers. Consult an occupational therapist or an orthopedics doctor.
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