The symptoms of tendon strain may be the following: 1. pain. If the tendon is strained, the local inflammation will be sterile, and some inflammatory factors will be secreted, causing local pain. 2. local swelling can occur, and after the strain, the local area will bleed, and at this time it will be edematous and locally swollen. 3. if the strain is serious, there may be impaired movement of the limb, such as limited flexion and extension. 4. if the tendon is completely ruptured, there will be no way to move and impaired movement at this time. 5.Some accompanying symptoms may appear, such as increased skin temperature, local numbness and swelling. If the tendon is particularly severe, there may be instability of the joint where the tendon is located, and muscle tears may occur.