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Complex regional pain syndrome is uncommon, and its cause is not clearly understood. CRPS typically develops after an injury, surgery, heart attack, or stroke. [8] [12] Investigators estimate that 2–5% of those with peripheral nerve injury, [13] and 13–70% of those with hemiplegia (paralysis of one side of the body) [14] will develop
This form, similarly to other forms of AMPS, is known to be able to spread from one limb to a new limb. 35% of people effected with CRPS report full-body impacts from the condition. Common symptoms of CRPS include musculoskeletal pain; swelling; changes to the skin texture, color, or temperature; and limited range of motion. [11]
Allodynia is a clinical feature of many painful conditions, such as neuropathies, [4] complex regional pain syndrome, postherpetic neuralgia, fibromyalgia, and migraine. Allodynia may also be caused by some populations of stem cells used to treat nerve damage including spinal cord injury .
The process known as "molecular mimicry" occurs when an infectious organism that shares epitopes from its host's afflicted tissue triggers an immune response in the host. However, only a small number of convincingly identified specific targets for such a response have been found in chronic inflammatory demyelinating polyneuropathy.
Complex regional pain syndrome (CRPS), for instance, presents with severe burning pain and redness except these symptoms are often unilateral (versus symmetric) and may be proximal instead of purely or primarily distal. Furthermore, attacks triggered by heat and resolved by cooling are less common with CRPS.
An infectious organism can escape the confines of the immediate tissue via the circulatory system or lymphatic system, where it may spread to other parts of the body. If an organism is not contained by the actions of acute inflammation, it may gain access to the lymphatic system via nearby lymph vessels .
The International Association for the Study of Pain (IASP) defines chronic pain as a general pain without biological value that sometimes continues even after the healing of the affected area; [8] [9] a type of pain that cannot be classified as acute pain [b] and lasts longer than expected to heal, or typically, pain that has been experienced on most days or daily for the past six months, is ...
It states, "Complex regional pain syndrome (CRPS), formerly reflex sympathetic dystrophy (RSD) or "causalgia",…" Thie "or" part is misleading in the extreme--it implies that RSD and causalgia are two names for the same thing.