Is Erythromelalgia hereditary?

Erythromelalgia can be hereditary when caused by specific genetic mutations, but many cases are sporadic and occur without a family history.

In the context of Erythromelalgia, it is important to distinguish between "genetic" (caused by an alteration in DNA) and "hereditary" (passed from parent to child). Primary Erythromelalgia is often associated with mutations in the SCN9A gene, which encodes a sodium channel protein. When these mutations are present, the condition typically follows an autosomal dominant inheritance pattern, meaning a child of an affected parent has a 50% chance of inheriting the pathogenic variant.

Genetic Testing and Patterns of Inheritance

While autosomal dominant inheritance is well-documented in familial cases, de novo (spontaneous) mutations are also frequently identified in patients with Erythromelalgia. This means the mutation occurred for the first time in the affected individual, even if neither parent carries the gene. Because the clinical presentation of Erythromelalgia can vary significantly even among family members with the same mutation, genetic counseling is highly recommended to interpret test results and discuss reproductive risks.

Clinical Guidance for Families

Genetic testing for SCN9A is available through specialized laboratories and is often recommended for individuals with early-onset or familial Erythromelalgia to confirm the diagnosis and guide management strategies. For families planning pregnancies, genetic counseling provides a space to discuss the implications of hereditary transmission. While prenatal diagnosis is technically possible if a specific familial mutation is known, it is rarely pursued; instead, many families focus on preimplantation genetic testing (PGT) during IVF to screen embryos. It is essential to note that not all cases of Erythromelalgia are genetic, as some forms are secondary to underlying conditions like myeloproliferative disorders or autoimmune diseases.

Medical Disclaimer: This information is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions regarding a medical condition.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Erythromelalgia


• Orphanet: Primary Erythromelalgia


• OMIM (Online Mendelian Inheritance in Man): Erythromelalgia; EM