Tendon rupture in the arm usually has the following symptoms: 1. Pain. When the tendon is ruptured, you will often hear a popping sound, which is the sound of the tendon rupture, and then there will be severe pain at the injury. 2, swelling. Because the tendon rupture will have local bleeding, then there will be obvious swelling at the ruptured tendon, and even bruising, bleeding and some other manifestations. 3, restricted movement. Because the tendon is often at the end of the muscle and ends at the bone, when the tendon is ruptured, there will be a corresponding restriction in the movement of the joint. Some patients can also touch a lump of the ruptured tendon at the place of injury, which can be more diagnosed as a rupture of tendon.