What are the common causes of joint pain?

Arthritis, swelling: Typically, the most common cause would probably be arthritiis where there is damage to the joint surfaces. Also, with many cases there can be associated synovitis when there is more fluid in the joint than normal which will cause increased pain and swelling. Treatment is usually with nsaid, local cortisone injections, and hyaluranate gel injections.

2 broad: Here r a few. Infants, infection or fractures adolescent=infection, , epiphyseal injury, trauma, juvi RA also in the younger. Older= arthritis, trauma, fracture, inflammation. In between, many more. Its is a specialty in medicine. Rheumatologists. Infectious disease. No 1 good answer.