Complex Regional Pain Syndrome (CRPS) is a chronic pain condition that often occurs following trauma, surgery, or nerve injury. However, sometimes there is no identifiable triggering event.

CRPS is characterized by severe pain, swelling, changes in skin color, alterations in temperature, and restricted movement in the affected region. Additional symptoms may include regional osteoporosis, trophic changes (skin, hair, nails), and muscle weakness.

Its exact cause is not fully understood, and treatment can be challenging. Diagnosis involves evaluating symptoms and the patient's medical history, with physical examination and imaging tests such as X-rays.

Treatment aims to reduce pain, improve mobility, and enhance quality of life. Options include medications, physical therapy, nerve blocks, psychotherapy, and rehabilitation programs. Sympathetic nerve blocks, especially for the arm from the neck or for the leg from the lower back, can be effective methods. In cases where these prove insufficient, a Spinal Cord Stimulator (SCS), or spinal cord implant, may be considered.