What is it?
A bursa reduces friction. Repeated pressure, trauma, crystals or infection can cause swelling; this differs from infection inside the joint.
Symptoms and important signs
Local swelling and tenderness, sometimes redness or warmth.
How is it assessed?
Examination; fluid sampling if infection or crystals are suspected.
Care and treatment options
Reduce pressure and treat the cause; infected bursae may need antibiotics or drainage.
When to seek help
Fever, spreading redness or an overlying wound requires prompt care.