Ankle sprains are caused by an unnatural twisting or force on the ankle bones of the foot, which may result in excessive stretching or tearing of one or more ligaments on the outside of the ankle. The severity of the sprain can impact the degree of damage as well as the type and duration of treatment. If not properly treated, ankle sprains may develop into long-term problems.

Primary symptoms of ankle sprains are pain following a twist or injury, swelling, and bruising.