The RSD medical abbreviation stands for reflex sympathetic dystrophy, an outdated label for the condition now known as complex regional pain syndrome type 1, or CRPS I. It describes long lasting, severe pain in an arm or leg, usually after an injury, surgery or immobilization, that is far stronger than the original injury would explain.
You will still find RSD in older charts, disability paperwork and some patient groups, while newer notes generally say CRPS. The letters also have an informal use outside medical diagnosis: rejection sensitive dysphoria, a term some people use to describe intense emotional pain from perceived rejection. That meaning is explained near the end.
At a glance
Stands for
Reflex sympathetic dystrophyCurrent name
Complex regional pain syndrome type 1 (CRPS I)Related form
CRPS II, formerly causalgia, with a known nerve injuryCommon triggers
Fracture, sprain, surgery, a cast or splintSpecialty
Pain medicine, neurology, orthopedics, rehabilitationInformal meaning
Rejection sensitive dysphoria (not a formal diagnosis)
What reflex sympathetic dystrophy means
The old name came from an early theory that an overactive sympathetic nervous system, the part that controls sweating, blood flow and skin temperature, drove the condition. That is now known to be only part of the story. Changes in the nerves, the immune response, blood flow and how the brain processes pain all seem to play a role, which is why the broader name complex regional pain syndrome replaced it.
The condition usually affects one hand, wrist, foot or ankle. It can begin days to weeks after a fracture or surgery, sometimes after a minor injury. Many people improve over months, especially with early treatment, but some have symptoms for much longer.
Signs clinicians look for
Doctors diagnose CRPS mostly from the history and exam, using a set of standard criteria. They look for continuing pain that is much worse than the injury itself would suggest, along with changes in several areas.
| Area | Examples |
|---|---|
| Sensation | Burning pain, pain from light touch, extra sensitivity |
| Blood flow and skin | Color changes, one limb warmer or cooler than the other |
| Swelling and sweating | Puffiness, more or less sweating on the affected side |
| Movement and growth | Stiffness, weakness, tremor, changes in hair, nail or skin growth |
No single test proves the diagnosis, though X-rays, bone scans or nerve studies such as EMG may help rule out other causes.
Reading the RSD medical abbreviation in a chart
Orthopedic follow up: "Dx: RSD L wrist following distal radius fx, refer to pain clinic and OT." The diagnosis is reflex sympathetic dystrophy of the left wrist after a break of the forearm bone near the wrist, and the patient is being sent to pain specialists and occupational therapy.
A newer version of the same note would likely read "CRPS type I, left wrist." Medical coders map either wording to complex regional pain syndrome codes based on the limb affected.
Common parts of a treatment plan
Treatment usually combines several approaches and aims to keep the limb moving. Physical and occupational therapy are central, often including graded movement and desensitization. Medicines may include anti inflammatory drugs, nerve pain medicines such as gabapentin or amitriptyline, short courses of steroids, or bisphosphonates in some cases. Some people receive nerve blocks or a spinal cord stimulator. Psychological support helps with the stress of long term pain. The mix differs from person to person, and a treatment plan is set by the pain or rehabilitation team.
Rejection sensitive dysphoria: the informal RSD
Outside medical diagnosis, RSD is also used for rejection sensitive dysphoria, a phrase describing very strong emotional pain in response to real or perceived rejection or criticism. It is often discussed in connection with ADHD. It is not a formal diagnosis in the main psychiatric manuals, so it rarely appears as a diagnosis code, but a therapy or psychiatry note may mention it in the patient's own words. If RSD shows up in a mental health note rather than an orthopedic or pain note, this meaning is the more likely one.
Frequently asked questions
What does RSD stand for in medicine?
RSD stands for reflex sympathetic dystrophy. It is the older name for complex regional pain syndrome type 1, a persistent pain disorder of an arm or leg that typically begins after an injury.
Is RSD the same as CRPS?
RSD is the older term for CRPS type 1. CRPS type 2, once called causalgia, is the form that follows a confirmed nerve injury. Most current notes use CRPS.
Why did doctors stop using the name RSD?
The name suggested the sympathetic nervous system was the whole cause, which research showed was not accurate. Complex regional pain syndrome describes the condition without assuming one mechanism.
What does RSD mean in mental health notes?
In therapy or psychiatry settings, RSD may mean rejection sensitive dysphoria, intense emotional pain from perceived rejection. It is a descriptive term rather than a formal diagnosis.