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Bursitis is a painful swelling of a small sac of fluid called a bursa. Bursae (plural of bursa) cushion and lubricate areas where tendons, ligaments, skin, muscles, or bones rub against each other. People who repeat the same movement over and over or who put continued pressure on a joint in their jobs, sports, or daily activities have a greater chance of getting it.

Bursitis is commonly caused by:
-Overuse and repeated movements. These can include daily activities such as using tools, gardening, cooking, cleaning, and typing at a keyboard.
-Long periods of pressure on an area. For example, carpet layers, roofers, or gardeners who work on their knees all day can develop bursitis over the kneecap.
-Aging, which can cause the bursa to break down over time.

Bursitis can also be caused by other problems, such as arthritis or infection (septic bursitis).

Tendons are cords of tough, fibrous connective tissue that attach
muscles to bones. Tendons are found throughout the entire human body.

Tendonitis is the inflammation and irritation of tendons. If the normal smooth gliding motion of a tendon is impaired the tendon will become inflamed and tendonitis will start to occur. Tendonitis, if it’s caught early, can be easily treated and cured.