Left supraspinatus tendon injury is an acute injury to the left supraspinatus tendon tissue, resulting in a tendency for the tendon to lose its toughness, strength and elasticity, and localized adhesions, sclerosis or ossification. Left supraspinatus tendon injury mainly refers to the left supraspinatus tendon injury, the loss of water and fibrous protein in the tendon, resulting in the tendon’s toughness, strength, elasticity is weakened, and local adhesion sclerosis or ossification may occur. Thus, it has some effect on the shoulder movement. Chronic weight-bearing activities or strenuous activities for a long time without attention to rest can lead to acute injury and degeneration of supraspinatus tendon tissue. At this time, the patient may feel persistent pain in the shoulder, and the shoulder joint lifting and abduction are also limited. Localized tightness and stiffness can be felt. The diagnosis can be clarified through ultrasound, magnetic resonance and other examinations. If the above symptoms occur, it is recommended to go to the hospital in time for early and regular treatment.