Frozen shoulder, also called adhesive capsulitis, causes pain and stiffness in the shoulder. Over time, the shoulder becomes very hard to move.

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The condition occurs more commonly in people with diabetes and in people who've kept their arm immobilized for a long period of time.

Symptoms may start gradually and resolve within one or two years.

Treatment involves stretching and sometimes injecting corticosteroids and numbing medications into the joint capsule. In some cases, surgery is used to loosen the joint capsule.