Frozen shoulder (adhesive capsulitis) is a common source of shoulder pain. It causes your shoulder joint capsule to shrink and significantly thicken, which leads to pain and a stiff shoulder joint capsule. This results in a reduced range of shoulder movement. It occurs in about 2% to 5% of the population and commonly presents in 40 to 60-year-olds. It is more prevalent in women (70%) over the age of 50 who are largely inactive. Your shoulder capsule is the deepest layer of so