Frozen shoulder, also known as adhesive capsulitis, is a condition characterized by stiffness and pain in the shoulder joint. It occurs when the connective tissue surrounding the shoulder becomes thickened and inflamed, limiting movement. This condition can develop gradually and may take several months to years to resolve. The exact cause of frozen shoulder is not always clear, but it is often associated with certain risk factors, such as previous shoulder injuries, surgery, or conditions like diabetes. Treatment typically involves physical therapy, pain management, and in some cases, corticosteroid injections to reduce inflammation and improve mobility.