The symptoms of medial collateral ligament injuries vary according to the location and degree of the injury, but generally there is pain, which may be accompanied by joint swelling and instability. Medial collateral ligament injury has elbow joint medial collateral ligament injury, knee joint medial collateral ligament injury and ankle joint medial collateral ligament injury, etc. In addition to pain, joint swelling and pain aggravated by activities, the different parts of its performance of the different symptoms, such as elbow joint medial collateral ligament injury is more serious can be seen in elbow flexion and extension of the function of the limitations. When the knee joint medial collateral ligament injury is more serious, walking instability, knee bending instability, etc., the ankle joint medial collateral ligament injury is limited ankle joint activities, ankle instability, easy to sprain. Medial collateral ligament injury should go to the regular hospital in time, and the doctor will determine the specific condition according to the symptoms, signs and auxiliary examination, and give the correct treatment according to the condition.