Could a zap to the nerves ease stubborn arm pain?

This study tests whether adding nerve stimulation (neuromodulation) to standard exercise and stretching can improve pain, movement, and quality of life in people with upper limb musculoskeletal problems. About 120 working-age adults who haven't had physical therapy will be split into four groups: two get nerve stimulation plus exercise, and two get exercise alone, with either two or three sessions per week for six months. The goal is to see if the nerve stimulation provides extra relief beyond exercise and stretching alone.