Sprains can be categorized into three different degrees of severity, each having its own healing time associated with it. Third-degree sprains, which are the most severe, take the longest to heal. Sprains of the first degree do not cause significant tissue damage and heal quickly. It is usually possible to treat a first-degree sprain at home by elevating the foot, applying ice, and staying off it. It usually takes less than a week for a person to recover fully. Second-degree sprains are caused by damage to one or more ligaments. With a second-degree sprain, swelling and bruising are more common, and additional treatment may be required. It may take 2-6 weeks for the injury to fully heal, so you should consult your physician for treatment and therapy. Third-degree sprains occur when the ligaments are torn. Painful popping sounds are usually associated with the condition. In addition to the swelling, bruising, and inability to bear weight on the foot, the foot will be inflamed. A cast or brace may be needed, and a visit to your doctor will be necessary. A full recovery from a third-degree sprain can take six to twelve weeks.