Adhesive capsulitis, commonly known as frozen shoulder, is a condition characterized by stiffness and pain in the shoulder joint. It occurs when the connective tissue surrounding the shoulder joint becomes thickened and inflamed, leading to restricted movement. This condition often develops gradually and can significantly impact daily activities. The exact cause of adhesive capsulitis is not fully understood, but it is more common in individuals aged 40 to 60 and can be associated with other conditions such as diabetes or thyroid disorders. Treatment typically involves physical therapy, pain management, and, in some cases, corticosteroid injections to reduce inflammation and improve mobility.