Frozen shoulder, also called adhesive capsulitis, involves stiffness and pain in the shoulder joint. Signs and symptoms typically begin slowly, then get worse. Over time, symptoms get better, usually within 1 to 3 years.

Having to keep a shoulder still for a long period increases the risk of developing frozen shoulder. This might happen after having surgery or breaking an arm.

Treatment for frozen shoulder involves range-of-motion exercises. Sometimes treatment involves corticosteroids and numbing medications injected into the joint. Rarely, arthroscopic surgery is needed to loosen the joint capsule so that it can move more freely.

It's unusual for frozen shoulder to recur in the same shoulder. But some people can develop it in the other shoulder, usually within five years.

Symptoms

Frozen shoulder typically develops slowly in three stages.

• Freezing stage. Any movement of the shoulder causes pain, and the shoulder's ability to move becomes limited. This stage lasts from 2 to 9 months.
• Frozen stage. Pain might lessen during this stage. However, the shoulder becomes stiffer. Using it becomes more difficult. This stage lasts from 4 to 12 months.
• Thawing stage. The shoulder's ability to move begins to improve. This stage lasts from 5 to 24 months.

For some people, the pain worsens at night, sometimes disrupting sleep.
 

Causes

The shoulder joint is enclosed in a capsule of connective tissue. Frozen shoulder occurs when this capsule thickens and tightens around the shoulder joint, restricting its movement.

It's unclear why this happens to some people. But it's more likely to happen after keeping a shoulder still for a long period, such as after surgery or an arm fracture.
https://www.mayoclinic.org/diseases-conditions/frozen-shoulder/symptoms-causes/syc-20372684

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