Sciatica refers to back pain caused by a problem with the sciatic nerve. This is a large nerve that runs from the lower back down the back of each leg. When something injures or puts pressure on the sciatic nerve, it can cause pain in the lower back that spreads to the hip, buttocks, and leg.
Osteoarthritis of the shoulder is a gradual wearing of the articular cartilage that leads to pain and stiffness. As the joint surface degenerates, the subchondral bone remodels, losing its sphericity and congruity. The joint capsule also becomes thickened, leading to further loss of shoulder rotation.
Subscribe to our Pain Management Advisor e-newsletter for tips to manage pain. Shoulder pain causes include: 1  Avascular necrosis. 2  Brachial plexus injury. 3  Broken arm. 4  Bursitis. 5  Cervical radiculopathy. 6  Dislocated shoulder. 7  Frozen shoulder. 8  Heart attack. 9  Impingement.