Common Causes of Shoulder Pain

The shoulder is comprised of three main bones: the humerus, or your upper arm bone, the scapula, or shoulder blade, and the clavicle, or collarbone. There are many conditions that can impact how these structures function, such as: 

• Bursitis. The bursae are fluid-filled sacs in the joints that act as lubrication to reduce friction. These sacs may become swollen after injury or overuse, causing bursitis. Pain makes it hard to do activities that involve lifting your arms, such as getting dressed or styling your hair. 

• Tendinitis. Tendons are the tissues that connect bones and muscles. When the tendon becomes inflamed, it results in tendinitis, which may be acute or chronic depending on the cause. This condition may affect the rotator cuff, a group of tendons and muscles surrounding the shoulder joint. 

• Dislocation. A dislocation occurs when the ball of the shoulder joint is partially or completely dislodged. Since the shoulder is the most mobile joint, it is especially susceptible to dislocation. 

• Tendon Tears. Degenerative diseases due to age can cause tendons to tear and split, separating them from the bone. 

• Arthritis. Arthritis impacts joints throughout the body, including those that make up the shoulder. An osteoarthritic shoulder produces symptoms including stiffness and pain. It develops slowly and often worsens due to age.