Bursitis is the inflammation of a bursa, which is a fluid-filled sac between the muscles, tendons, skin, and bones near your joints. Over 150 bursae in your body act as cushions between moving ...

Bursitis affects the bursa, typically caused by overuse or injury. Symptoms: Arthritis causes pain, stiffness, and swelling in multiple joints, often progressively. Bursitis causes localized ...