Condition 101 About Erythromelalgia

What is the definition of Erythromelalgia?

Erythromelalgia is a condition characterized by episodes of pain, redness, and swelling in various parts of the body, particularly the hands and feet. These episodes are usually triggered by increased body temperature, which may be caused by exercise or entering a warm room. Ingesting alcohol or spicy foods may also trigger an episode. Wearing warm socks, tight shoes, or gloves can cause a pain episode so debilitating that it can impede everyday activities such as wearing shoes and walking. Pain episodes can prevent an affected person from going to school or work regularly.

The signs and symptoms of erythromelalgia typically begin in childhood, although mildly affected individuals may have their first pain episode later in life. As individuals with erythromelalgia get older and the disease progresses, the hands and feet may be constantly red, and the affected areas can extend from the hands to the arms, shoulders, and face, and from the feet to the entire legs.

Erythromelalgia is often considered a form of peripheral neuropathy because it affects the peripheral nervous system, which connects the brain and spinal cord to muscles and to cells that detect sensations such as touch, smell, and pain.

What are the causes for Erythromelalgia?

Mutations in the SCN9A gene can cause erythromelalgia. The SCN9A gene provides instructions for making one part (the alpha subunit) of a sodium channel called NaV1.7. Sodium channels transport positively charged sodium atoms (sodium ions) into cells and play a key role in a cell's ability to generate and transmit electrical signals. NaV1.7 sodium channels are found in nerve cells called nociceptors that transmit pain signals to the spinal cord and brain.

The SCN9A gene mutations that cause erythromelalgia result in NaV1.7 sodium channels that open more easily than usual and stays open longer than normal, increasing the flow of sodium ions into nociceptors. This increase in sodium ions enhances transmission of pain signals, leading to the signs and symptoms of erythromelalgia. It is unknown why the pain episodes associated with erythromelalgia mainly occur in the hands and feet.

An estimated 15 percent of cases of erythromelalgia are caused by mutations in the SCN9A gene. Other cases are thought to have a nongenetic cause or may be caused by mutations in one or more as-yet unidentified genes.

How prevalent is Erythromelalgia?

The prevalence of erythromelalgia is unknown.

Is Erythromelalgia an inherited disorder?

Some cases of erythromelalgia occur in an autosomal dominant pattern, which means one copy of the altered gene in each cell is sufficient to cause the disorder. In some of these instances, an affected person inherits the mutation from one affected parent. Other cases result from new mutations in the gene and occur in people with no history of the disorder in their family.

Top Global Doctors For Erythromelalgia

Latest Advances On Erythromelalgia

  • Condition: Small Fiber Neuropathy associated with Autoinflammatory Syndrome
  • Journal: Muscle & nerve
  • Treatment Used: Anti-Interleukin-1 Agents, Intravenous Immunoglobulin, and Glucocorticoids
  • Number of Patients: 4
  • Published —
This case report describes 4 patients with small fiber neuropoathy that was associated with autoinflammatory syndrome.

Clinical Trials For Erythromelalgia

Clinical Trial
  • Status: Recruiting
  • Phase: N/A
  • Intervention Type: Procedure
  • Participants: 24
  • Start Date: August 26, 2019
Spinal Cord Stimulation for Refractory Pain in Erythromelalgia
Clinical Trial
  • Status: Recruiting
  • Intervention Type: Other
  • Participants: 100
  • Start Date: February 2012
Painful Channelopathies Study