Tendon sheath inflammation refers to the exudation and adhesion between the tendon and tendon sheath caused by excessive flexion and extension activities, resulting in a sterile inflammatory response with symptoms of localized pain and limited mobility. In the early stages of adhesive inflammation, there is severe pain in the affected area along with limited flexion and mobility. As the condition progresses and with increasing age, severe proliferation of the tendon sheath may cause compression on the tendon, leading to symptoms of constrictive tendon sheath inflammation, particularly in the extensor tendons of the index and thumb fingers, commonly known as trigger finger.