Acute frozen shoulder is commonly characterized by sudden pain in the shoulder joint, as well as limited movement of the joint. Acute frozen shoulder refers to the inflammation of the shoulder joint and the soft tissues around the joint. Usually, the pain will appear earlier, and the limitation of activity will appear later. 1. Sudden pain in the shoulder joint: it causes sudden pain in the shoulder joint during movement and at night, and as the disease progresses, the pain can last all day long. 2. Restriction of joint movement: Due to pain, the joint cavity will become stiff, thus restricting the movement of the shoulder joint and narrowing the range of motion. If you have the above symptoms or are diagnosed with frozen shoulder, it is recommended that you go to the hospital in time for a complete examination and standardized treatment under the guidance of the doctor.