Complex regional pain syndrome (CRPS), formerly known as reflex sympathetic dystrophy syndrome (RSD), is a chronic pain condition that typically affects an arm or leg. It often follows an injury or trauma to the affected limb. The pain caused by CRPS is ongoing and severe and can spread to other areas of the body.

Symptoms

The main symptom of Complex Regional Pain Syndrome is ongoing, severe pain that is disproportionate to the inciting event. The affected area may appear swollen, have changes in skin coloring or texture, or feel cooler or warmer than the surrounding skin. Other common symptoms include:

- Intense burning pain, sharp stabbing sensations or throbbing pain. The pain seems out of proportion to the inciting trauma and persists long after the injury has healed.

- Sensitivity to touch - even light clothing or a breeze can cause severe pain.

- Changes in skin temperature, texture or color compared to the unaffected side. The skin may be blotchy, flaky or shiny. It may alternate between feeling hot and cold.

- Sweaty skin or excess sweating in the affected area.

- Stiffness, swelling or skin which feels tight. Joints may become stiff.

- Tremors or shaking in the affected limb.

- Changes in nail and hair growth on the affected side compared to the other side. Nails may grow more slowly or hair may be less dense.

- Motor symptoms like weakness, paralysis or involuntary movements in the affected limb.

- Problems with coordination and balance on the affected side of the body.

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