Bursitis is the inflammation of a bursa, which is a fluid-filled sac between the muscles ... but symptoms often affect the ...

Arthritis is a health condition that can cause swelling and tenderness in one or more joints whereas bursitis causes ...

There were no tears, no “structural damage,” but the bursa — the sac that cushions the knee joint — filled with fluid, and I could barely bend it. Still, I kept playing, ballooning my knee ...