(HealthDay News) -- Hip bursitis occurs when the bursa, a small sac of fluid that cushions the hip joint, becomes inflamed.

The American Academy of Orthopaedic Surgeons mentions these risk factors for hip bursitis:

• Having a repetitive stress injury from overuse, which may be caused by factors such as biking, running or long periods of standing.
• Having an injury to the hip from falling, bumping the hip or resting on the hip for a long period.
• Having a spinal condition such as scoliosis or arthritis.
• Having one leg that is shorter than the other.
• Having had rheumatoid arthritis or a previous surgery on or near the hip.
• Having calcium deposits or bone spurs affecting the hip.