Frozen shoulder is staged according to the clinical manifestations, and the specific stages are as follows: 1. Pre-adhesion stage: the main manifestation is severe pain around the shoulder joint, mainly at night, which can last 1-3 months; 2. Adhesion stage: the main manifestation is limited function of internal rotation, dorsiflexion and abduction of the shoulder joint, and the pain around the shoulder is relieved, but the pain worsens when moving, which can last more than 1 year; 3. Remission stage: after about 15 months, the pain symptoms around the shoulder are gradually relieved until they disappear completely, and the function of the shoulder joint is gradually restored.