Frozen shoulder, also called adhesive capsulitis, causes pain and stiffness in the shoulder. Over time, the shoulder becomes very hard to move. After a period of worsening symptoms, frozen shoulder tends to get better, although full recovery may take up to 3 years. Physical therapy, with a focus on shoulder flexibility, is the primary treatment …
https://orthoinfo.aaos.org/en/diseases–conditions/frozen-shoulder/