There are many reasons why a patient may experience pain in the arm and not be able to lift it. The most common reason is that the patient has frozen shoulder. The most common reason is that the patient has frozen shoulder. Due to injury to the shoulder muscles and surrounding soft tissues, the shoulder muscles become adherent, so when the patient moves the shoulder joint, it can cause pain by pulling on the injured muscles and also affect the patient’s shoulder joint movement. In addition, if the patient has rotator cuff injury, due to the muscle damage, the patient may also experience pain when moving the shoulder joint, while the active movement of the shoulder joint is limited, while the passive movement of the shoulder joint can be normal. In addition, if a patient has cervical spondylosis, the spinal cord is compressed and the nerve roots are stimulated, resulting in pain, numbness, and muscle weakness in the shoulder or upper extremity, which can also affect the functional activities of the shoulder joint. An MRI of the cervical spine can be taken to make a clear diagnosis and the degree of cervical spondylosis.