hi there, the various causes of right shoulder pain are bursitis, biceps tendon rupture, labrum tear, rotator cuff tendonitis, muscle spasm, pinched nerve and shoulder
dislocation. Other possibilities are gall bladder disease, or gallstones, liver abscesses, disorders of esophagus; penetrating ulcer in stomach, pancreas, and frozen shoulder is a common cause for stiffness and pain in shoulder. This could also be a sign of osteoarthritis and rheumatoid arthritis.