Bursae are small sac filled with lubricating fluid located near your joints between tendons, muscles and bones. The bursae reduce friction and irritation caused by rubbing. When the bursae become inflamed, you have the condition known as bursitis.

Common locations for bursitis include the shoulder, elbow, hip, knee and Achilles tendon.

Pain is commonly the first symptom of bursitis. The pain may build gradually or it may occur suddenly.

If you experience any of the following symptoms, consult your doctor:

A fever over 102 degrees Faherenheit
General Illness or multiple sites of pain
Inability to move the affected area
Swelling, redness, and warmth

These symptoms may be signs of a different more serious problem.

Repetitive use, overuse, or sudden more serious injury often causes bursitis.

Physical disparities between your limbs, such as a length difference in your legs, or arthritis in a joint that affects your gait can stress your bursae and cause inflammation. Some autoimmune diseases like rheumatoid or psoriatic arthritis may also create stress and inflammation leading to bursitis. Thyroid disorders, unusual medication reactions or an inflammation may also initiate this condition.