The most common type of sprain is the ankle sprain. Ankle sprains have differing degrees of severity. Mild or minimal sprains with no tear of the ligament usually produce mild tenderness and some swelling. Moderate sprains, in which the ligament has been partially ruptured, produce obvious swelling, bruising, significant tenderness, and difficulty walking. Severe sprains, as when the ligament is completely torn from the bone (called avulsion), make walking impossible and produce marked swelling, internal bleeding and joint instability.
Symptoms of strains include muscle soreness, muscle spasm, pain, and possibly swelling or warmth over the involved muscle.