1- Psoriasis/psoriatic arthritis
2- Inflammation in the bowels (Crohn's Ulcerative colitis)
3- Inflammatory spondylitis (inflammation in the back)
4- Sarcoidosis (inflammation in the joints, lungs, and rarely nerves)
5- sometimes it is a mechanical problem which means the tendon itself has a problem or the attachment surface has a spur.
pain killer and physical therapy