How is periarthritis of shoulder diagnosed? Periarthritis of shoulder is a self-limiting disease that mainly affects middle-aged and elderly women. The primary symptoms are pain in the shoulder accompanied by limited mobility of the shoulder joint. So how is periarthritis of shoulder diagnosed? Firstly, medical history is very important. Diagnosis is determined based on the medical history. Additionally, an MRI of the shoulder joint can be performed to clarify whether there is adhesion of the muscles and tendons within the joint, which causes limited mobility of the shoulder joint, in order to further confirm the diagnosis. Thus, the diagnosis of periarthritis of shoulder is based first on the medical history and the characteristics of the onset of the disease, and also on the MRI of the shoulder joint to confirm the diagnosis.