What condition is characterized by inflammation of the bursa causing swelling and pain?

Bursitis is the condition characterized by inflammation of the bursa, which are small, fluid-filled sacs that provide cushioning and reduce friction between tissues in the body, such as between bone and muscles or tendons. When these bursae become inflamed, it leads to symptoms including swelling, pain, and reduced range of motion in the affected area.

Injuries, repetitive movements, or prolonged pressure on a bursa can cause bursitis. Common sites for bursitis include the shoulder, elbow, hip, and knee, where these structures are especially vulnerable to irritation and inflammation. Understanding bursitis is important as it can mimic other conditions but is distinct due to its specific involvement of the bursa.

Other conditions listed, such as tendinitis, plantar fasciitis, and patellar tendonitis, involve inflammation of tendons or specific tissues but do not directly involve the bursa, which is the defining factor for identifying bursitis.