Minor shoulder problems, such as sore muscles and aches and pains, are common. Shoulder problems develop from everyday wear and tear, overuse, or an injury. They can also be caused by the natural process of ageing.Your shoulder joints move every time you move your arms. To better understand shoulder problems and injuries, you may want to review the anatomy and function of the shoulder. The shoulder is a ball-and-socket joint with three main bones: the upper arm bone (humerus), collarbone (clavicle), and shoulder blade (scapula). These bones are held together by muscles, tendons, and ligaments. The shoulder joint has the greatest range of motion of any joint in the body. Because of this mobility, the shoulder is more likely to be injured or cause problems. The acromioclavicular (AC) joint, which lays over the top of the shoulder, is also easily injured.Shoulder problems can be minor or serious. Symptoms may include pain, swelling, numbness, tingling, weakness, changes in temperature or colour, or changes in your range of motion. Shoulder injuries most commonly occur during sports activities, work-related tasks, projects around the home, or falls. Home treatment often can help relieve minor aches and pains.The rotator cuff is a group of strong, rope like fibres (tendons) and muscles in the shoulder. Rotator cuff disorders occur when tissues in the shoulder get irritated or damaged. Rotator cuff disorders include:•Inflammation of the tendons (tendonitis) or of a bursa (bursitis). In the shoulder, a bursa is a small, fluid filled sac that serves as a cushion between the tendons and the bones. •Impingement, in which a tendon is squeezed and rubs against bone. •Calcium build-up in the tendons, which causes a painful condition called calcific tendonitis. •Partial or complete tears of the rotator cuff tendons.Symptoms of a rotator cuff disorder include pain and weakness in the shoulder. Most often, the pain is on the side and front of the upper arm and shoulder. It may hurt or be impossible to do everyday things, such as comb your hair, tuck in your shirt, or reach for something. You may have pain during the night and trouble sleeping.