Left arm pain, and can not lift, common causes are left upper limb fracture, left shoulder periarthritis, etc., as follows: First, left upper limb fracture: including shoulder fracture, clavicle fracture and upper limb fracture, can lead to left arm pain, swelling, and can be accompanied by limited activity, can not lift, take X-ray will find bone cortical fracture, and even fracture end misalignment, sometimes need surgery to cut and reset plate screw internal Sometimes, surgery is needed to reposition the fracture and fix it internally. Secondly, left shoulder periarthritis: it causes adhesion zone around the left shoulder capsule, which can cause pain in the left shoulder joint and disperse to the left upper limb, affecting left upper limb activities, especially affecting forward flexion, abduction and other directional activities, and even passive activities cannot be lifted. Therefore, after the appearance of left arm pain and the inability to lift it, early diagnosis and early treatment are necessary, and the best treatment method should be selected according to different etiologies in order to make the patient improve rapidly.