Complex Regional Pain Syndrome or CRPS for short is according to the NHS website a poorly understood condition in which a person experiences persistent severe and debilitating pain.
Although most cases of CRPS are triggered by an injury, the resulting pain is much more severe and long-lasting than normal.
The pain is usually confined to one limb, but it can sometimes spread to other parts of the body.
The skin of the affected body part can become so sensitive that just a slight touch, bump or even a change in temperature can provoke intense pain.
Affected areas can also become swollen, stiff or undergo fluctuating changes in colour or temperature.
Many cases of CRPS gradually improve to some degree over time, or get completely better. However, some cases of CRPS never go away, and the affected person will experience pain for many years.
Many people ask if it the same as Fibromyalgia but while Fibromyalgia can be quite painful there still exists no other chronic pain syndrome that touches CRPS in its intensity; Fibromyalgia can come and go into remission for weeks or months at a time while it is much more rare for that to happen for CRPS.
The other problem that occurs is that many CRPS patients develop Fibromyalgia and end up with both to some degree.
A good website in the UK which explains CRPS in great detail is CRPS-UK.Org