There are many early symptoms of rotator cuff injury, which can be mainly categorized into shoulder joint pain, activity limitation and so on. 1. Shoulder pain: rotator cuff injury will cause shoulder pain, pain is the early symptom of the disease, usually in the absence of obvious factors, trauma, pain is mainly indirect, especially at night, pain is more obvious. 2. Activity limitation: patients can show limitation of activity of the affected limb, such as lifting movement, unable to abduct, lifting weakness, etc., when moving the shoulder joint, there will be obvious pain, and in serious cases, there will even be a sense of instability of the shoulder. There are many early symptoms of rotator cuff injury, after the appearance of the above symptoms, it is recommended that the patient consult the doctor in time, so as not to damage the function of the shoulder joint, and take standardized treatment for it in time.