Whether a shoulder tendon is ruptured or not can be determined by symptoms such as shoulder swelling, shoulder pain, unfavorable shoulder movement, and auxiliary examination. 1. Shoulder swelling: When the shoulder tendon is ruptured, the small blood vessels around the tendon may rupture and bleed, so that the blood circulation at the ruptured tendon changes, causing the blood to accumulate in the muscle and other soft tissues, and the tendon and other tissues become inflamed due to the rupture, and then there will be obvious swelling in the shoulder. 2. Shoulder pain: if shoulder tendon rupture occurs, in addition to the damage of the tendon itself, there can also be damage to the surrounding small nerves, the local tissues will have tissue fluid and other substances oozing out, which makes the peripheral nerves around the stimulation, resulting in the patient’s pain is more obvious, and if the pain position occurs activities, the pain will be further aggravated. 3. Unfavorable shoulder movement: When there is rupture of the shoulder tendon, the continuity of the tendon is changed, which makes the shoulder tendon ineffective in pulling the shoulder muscles and controlling the movement of the shoulder joint, thus restricting the movement of the shoulder joint in all directions, and the flexion and extension of the shoulder is also impaired, resulting in unfavorable shoulder movement. 4. Auxiliary examination: For patients with shoulder tendon rupture, magnetic resonance of the shoulder joint and other examinations are often used for diagnosis, which can visualize whether the tendon has lost its continuity through imaging to determine whether the shoulder tendon has been ruptured or not. If you suspect that the shoulder tendon has been ruptured, you should consult a doctor in time and improve the examination and regular treatment under the guidance of the doctor.