RSD, now formally called complex regional pain syndrome (CRPS), is not inherited in a straightforward way like eye color or cystic fibrosis. No single gene causes it, and no clear inheritance pattern has been identified. However, the condition does run in families more often than chance would explain, with estimates suggesting up to 25% of people with CRPS have an affected family member. The current understanding points to a genetic predisposition that makes some people more vulnerable to developing CRPS after an injury, rather than a direct genetic cause.
How Often CRPS Runs in Families
Several studies have tried to pin down how frequently CRPS clusters within families, and the numbers vary. In one study of 60 people with CRPS who developed the condition after an injury, 20% also had affected family members. A clinical review of 69 additional cases found that 13 to 15% came from families where more than two members had the condition. A larger investigation identified 31 families with two or more affected relatives, including two families where five members had CRPS and four families with four affected members each.
These numbers are higher than you’d expect if the condition were purely random, but they still represent a minority of all cases. The best estimate from a systematic review in the Canadian Journal of Pain is that a familial form of CRPS accounts for less than 25% of people with the condition. The remaining 75% or more develop it without any family history at all.
Why It’s Not Simple Inheritance
None of the studies examining familial CRPS have found a pattern that follows classic genetic inheritance rules. If CRPS were caused by a single dominant or recessive gene, researchers would see predictable ratios of affected family members across generations. That pattern doesn’t exist. Instead, the most likely explanation is what geneticists call a multifactorial model, where multiple genes interact with each other and with environmental triggers like physical trauma.
Think of it less like inheriting a disease and more like inheriting a susceptibility. Some people carry genetic variations that affect how their immune system responds to injury, how their nerves process pain signals, or how their blood vessels regulate temperature. Individually, none of these variations cause CRPS. But stacked together, and combined with the right trigger (usually a fracture, surgery, or other tissue injury), they may tip the scales toward developing the condition. Research published in the Journal of Medical Genetics found that a genetic predisposition may play a role in up to a third of cases, with this effect being most prominent in males.
What Genes Have Been Studied
Researchers have investigated several candidate genes without finding a definitive “CRPS gene.” Variations in genes related to the immune system’s inflammatory response, particularly those controlling proteins involved in inflammation, have been linked to earlier onset and greater severity. These are the kinds of genes that influence how aggressively your body responds to tissue damage.
One promising lead involved a gene called SCN9A, which encodes a sodium channel important for pain signaling. Mutations in this gene cause two other painful conditions that share clinical features with CRPS. However, when researchers sequenced the gene in multiple CRPS families, they found no causal mutations. The gene doesn’t appear to play a major role in familial CRPS, though a minor contribution in individual cases hasn’t been ruled out.
Researchers have also identified four specific genetic variations (single nucleotide polymorphisms) that each appear to independently increase the risk of developing CRPS after an injury. These aren’t rare mutations. They’re common variations that, by themselves, do very little. Their significance lies in how they interact with each other and with physical trauma.
The Role of Mitochondrial Inheritance
One small but notable finding involves mitochondrial disease, which is passed from mother to child through mitochondrial DNA. In a study from a pediatric genetics practice, eight children with CRPS also had maternally inherited mitochondrial disease. Six of the seven families in the study showed probable maternal inheritance. These children also had other conditions related to the autonomic nervous system, including digestive problems, migraines, cyclic vomiting, and chronic fatigue.
This doesn’t mean mitochondrial disease causes CRPS in most people. But it suggests that in some children, particularly those who also have unexplained fatigue, gut issues, or migraines, an inherited mitochondrial condition may create the biological groundwork that makes CRPS more likely to develop.
Genetic Predisposition vs. the Trigger
The core question with CRPS has always been: why do some people develop this condition after a routine fracture or surgery while most people heal normally? The emerging answer is that genetic background loads the gun, but physical trauma pulls the trigger. These “predisposition genes” sit quietly until an injury activates them, at which point the body’s pain and immune responses spiral out of proportion to the original damage.
Among people who’ve had surgery or significant injuries, about 3% develop CRPS within a year, and around 6.5% within two years. That’s a meaningful rate for a high-risk population, but it still means the vast majority of people with the same injuries recover without CRPS. The difference likely comes down to a combination of genetic vulnerability, the type and location of injury, and potentially other factors like psychological stress and prior pain experiences.
What This Means if CRPS Runs in Your Family
Having a family member with CRPS does not mean you will develop it. Even in families with multiple affected members, not everyone who experiences an injury goes on to develop the condition. There is no genetic test that can predict CRPS, and no preventive treatment based on family history currently exists.
What a family history does suggest is that your body may have a heightened inflammatory or pain response to certain types of injuries. If you’re facing elective surgery and CRPS runs in your family, that’s worth mentioning to your surgical team. Some clinicians factor family history into their approach to pain management during and after procedures, which may help reduce risk even if the connection isn’t fully understood yet.