A rotator cuff injury can cause a dull ache in the shoulder, which often increases when you try to sleep on the involved side.

Rotator cuff injuries occur most often in people who repeatedly perform overhead motions.

Impingement occurs when there is a pinching of tendons or bursa in the shoulder. With impingement syndrome, pain is persistent and affects everyday activities, especially when trying to raise the arm. 

Tendinitis and burstis are the common cause of shoulder pain and stiffness. This indicates swelling of a particular area within the shoulder joint. Inflammation is a common cause of this pain.

A sprain is a stretching or tearing the of ligaments that connect two bones together in your joints. A strain is a stretching or tearing of muscle or a tendon. A tendon is a tissue that connects muscles to bones. Both of these conditions are resolved quickly and efficiently with chiropractic care.

A "pinched nerve" usually causes pain in one shoulder only. It’s also typically a sharp pain, as opposed to a dull ache or a strain that you might feel in muscle tissue. Turning your head may worsen the pain. Neck pain and headaches in the back of your head are also signs that the cause of all this discomfort is a "pinched nerve". Masotherapy and manipulation are simple, effective ways to treat this condition.