Shoulder pain when shooting basketball is considered to be related to tendonitis, rotator cuff injury, trauma and so on. 1. Tendonitis: long-term use of the shoulder joint can lead to shoulder muscle strain and thus tendonitis, commonly seen in the biceps long head tendonitis, which may induce pain when shooting. 2. Rotator cuff injury: when playing basketball, the activity of the shoulder becomes bigger, which can easily cause rotator cuff injury and tear, and it can cause obvious pain when doing uplifting action of the arm such as shooting. 3. Trauma: If you are in the process of playing basketball, strenuous activities or impact, it may cause shoulder joint dislocation, fracture and other traumatic injuries, and shoulder pain will also occur when you are shooting. Basketball shoulder pain may also be related to other reasons, you should consult a doctor in time to clarify the cause and standardize the treatment under the guidance of the doctor.