Bursitis is the inflammation of a bursa, a small fluid-filled sac that cushions and reduces friction between bones and soft tissues. It commonly affects areas like the shoulders, elbows, and hips, causing pain, swelling, and tenderness. Bursitis can result from repetitive movements, trauma, or underlying conditions such as arthritis. Treatment typically involves rest, ice, anti-inflammatory medications, and physical therapy to reduce inflammation and alleviate symptoms. In some cases, corticosteroid injections or aspiration of the bursa may be necessary for relief.