It is a painful condition that affects the bursae. Bursae are the fluid-filled sac like structures which are present around the joints. When these little sacs get inflamed a painful condition of bursitis happens. Most commonly it may occur in shoulder, elbow and hip joint but it may also occur in knee and heel joint.
This painful condition may be caused by following reasons
Repetitive motions that put extra pressure on bursae
Trauma or injury
This painful condition generally show following symptoms