The time it takes for ligament injuries to reduce swelling will depend on the extent of the injury and the individual’s physical condition. It usually takes 1~8 weeks. 1. Mild injury: there is no rupture, or no other structural damage, at this time to take the brake, physical therapy, cold compresses in the early 72 hours to reduce local swelling vasoconstriction, after 72 hours can be changed to hot compresses, can promote local blood circulation and inflammatory absorption, usually about a week can gradually reduce swelling. 2. Moderate injury: partial ligament tear, small tear range, does not affect the stability of the joint, conservative treatment is needed, such as plaster or brace fixation, oral non-steroidal anti-inflammatory painkillers, or localized hot compresses, infrared and other physiotherapy methods, usually in about 3 to 4 weeks of gradual recovery. 3. Severe injury: most of the ligaments are torn or completely ruptured, and surgery is needed. After treatment and rehabilitation, it usually takes 6 to 8 weeks for the ligaments to gradually recover and the swelling to go down. If diagnosed with ligament injury, it is recommended to consult the hospital in time, under the guidance of the doctor for standardized treatment, the above medication should be taken in accordance with medical advice.