Complex Regional Pain Syndrome-type 1 (CRPS-I) is a chronic pain condition that usually affects one limb, typically after an injury or surgery. The pain is often described as burning, stabbing, or throbbing and can be accompanied by swelling, changes in skin color and temperature, and sensitivity to touch. The exact cause of CRPS-I is not fully understood, but it is believed to involve malfunctioning of the nervous system.