Anterolateral shoulder pain may be caused by frozen shoulder, rotator cuff injury, acromioclavicular impingement syndrome and other reasons. 1. Frozen shoulder: a disease characterized by limitation of both active and passive activities of the shoulder joint, due to the stimulation of inflammation, patients may experience pain in the anterior side of the shoulder. 2. Rotator cuff injury: the rotator cuff is strained, torn or chronically injured due to direct or indirect impact, pulling or degenerative changes of the shoulder joint, which may cause pain in the front side of the shoulder. 3. Acromioclavicular impingement syndrome: it refers to a series of syndromes caused by repeated wear and tear of the rotator cuff on the acromion, including tendon degeneration, osteophytes, shoulder pain, etc. The main manifestations are shoulder pain, movement, and shoulder pain. The main manifestations are shoulder pain, activity limitation and so on. There are many causes of this symptom, and it is recommended that patients with anterolateral shoulder pain go to the hospital in a timely manner and follow the doctor’s instructions for treatment to avoid delaying their condition.