A sprain is caused by the twisting or bending of a joint into a position it was not designed to move. The ankle is the most commonly sprained joint. Some common symptoms of a sprain are pain around the joint, swelling, and bruising.
Update Date 3/5/2015
Updated by: C. Benjamin Ma, MD, assistant professor, chief, sports medicine and shoulder service, UCSF Department of Orthopaedic Surgery, San Francisco, CA. Also reviewed by David Zieve, MD, MHA, Isla Ogilvie, PhD, and the A.D.A.M. Editorial team.