What Could Be Causing Your Arm Pain? Ten Possibilities

7. Rheumatoid Arthritis

Rheumatoid arthritis is a chronic inflammatory disorder that causes impaired function in the joints, especially the elbows, wrists, hands, and feet. People with this progressive autoimmune disease develop painful swelling and stiffness that gradually results in joint deformity. Arthritis can strike at any age, although there are two forms: juvenile rheumatoid arthritis which affects children age 16 or younger, and an adult form. Common symptoms include tenderness in the joints, fatigue, weight loss, and morning stiffness. The symptoms of this condition mimic other diseases, so it can be difficult to diagnose.