Frozen shoulder typically causes persistent pain and a gradual loss of shoulder movement. The pain can be aching, dull, or sharp, usually felt deep inside the shoulder and sometimes radiating down the outer upper arm. Pain intensity may fluctuate daily depending on arm use, often interfering with daily activities and sleep. The loss of movement happens because scarring within the joint capsule restricts motion, progressively reducing the shoulder’s range. While gentle stretching of these adhesions is safe, it may temporarily increase pain. Other symptoms can include weakness, numbness, muscle spasms, and occasional joint clicking.