1.Causes
Doctors don’t know exactly what causes it, though some things make you more likely to have it. For example, it can happen if you can’t move your shoulder very well because of an injury or surgery, or if you have diabetes, which can worsen symptoms and make them last longer. Thyroid problems, Parkinson’s disease, heart disease, and certain HIV medications also seem to raise your odds of getting frozen shoulder.
2.Stage 1: Freezing
Over a period of 2 to 9 months, the shoulder capsule gets more and more inflamed. This ramps up pain and stiffness, and starts to limit your range of motion (how well you can use the joint). And these symptoms often get worse at night.
