In daily life, patients often experience pain in the left arm and are unable to lift it upward. There are many reasons for this phenomenon, such as damage to the muscles and muscle groups in the left arm area due to overexertion, strain or acute trauma. When lifting the arm, the injured muscles and muscle groups are pulled and cause pain, which affects the patient’s movement. If the patient has rotator cuff injury or frozen shoulder, there will also be painful pulling on the left arm when moving the shoulder joint, which will affect functional activities. The patient can be treated with non-surgical treatment, such as applying heat to the painful area, applying ointment to activate blood circulation and remove blood stasis, or fumigating with Chinese medicine.