The pain of a tendon in the back may be related to the following causes: 1. muscle spasm in the back, which is often seen when the patient does excessive activities or has a bad posture, resulting in a certain group of muscles in the back being under tension for a long time, which then produces spasm, and the patient will feel a long painful area in the back. 2. peripheral nerve lesions, such as in the onset of cervical spondylosis and lumbar disc herniation, there is 3. spinal-related ligament damage, such as when the patient does strenuous activities or lifting heavy objects, if the spinal-related ligament damage, then it may cause back tendon pain. 4. visceral-related lesions, such as the onset of severe myocardial infarction, it may produce radioactive pain in the back of the In the case of severe myocardial infarction, for example, there may be radiating involvement pain in the middle of the back and left side of the back of the shoulder, which may cause the patient to mistake the presence of tendon pain.