<unk>  <unk>  is a chronic progressive disease characterized by severe<unk> , swelling, and changes in the skin.<unk>  <unk>  is a chronic<unk>  condition that can affect any area of the body, but it often affects an arm or a leg.
It is important to understand that not all<unk> s are the same. It is quite possible to have a post-phlebitic syndrome involving the leg that may present with skin color changes, excess<unk> , and swelling, but has nothing to do with RSD.
The cause of<unk>  is currently unknown. Precipitating factors include underlying illnesses (especially vascular disease, an underlying rheumatic condition, a hidden infection or a coagulopathy in RSD cases), orthopedic injury, and surgery.  Although there are documented cases that have no identifiable injury to the original site in almost all cases of RSD, there was an underlying event or injury.
Complex regional pain syndrome
Myofascial pain syndrome
Eosinophilia myalgia syndrome
Polymyalgia rheumatica
Sciatica
Legius syndrome
Carpal tunnel syndrome
Fibromyalgia