Erythromelalgia is a distressing and difficult to manage condition that affects the hands and feet and is characterized by intermittent attacks with the triad of symptoms of redness, warmth and burning pain that can last from minutes to days. It needs to be differentiated from chilblains and burning feet syndrome. It has a significant impact on quality of life and the ability to carry out the activities of daily living.

Erythromelalgia is a rare and often debilitating vascular peripheral pain disorder characterized by episodes of redness, intense burning pain, warmth, and swelling, usually affecting the extremities—most commonly the feet and hands. The condition can be primary (idiopathic or genetic) or secondary to other diseases such as myeloproliferative disorders (like polycythemia vera), autoimmune diseases, or neuropathies. Symptoms are typically triggered or worsened by heat, exercise, stress, or wearing warm footwear, and are often relieved by cooling the affected areas. However, excessive cooling can lead to tissue damage, making symptom management a delicate balance.

The pathophysiology of erythromelalgia is not completely understood, but in primary forms, mutations in the SCN9A gene, which encodes the Nav1.7 sodium channel in sensory and sympathetic neurons, are known culprits. These mutations result in hyperexcitability of pain pathways, which likely explains the severe burning sensations patients report. In secondary erythromelalgia, the symptoms may result from increased blood flow due to microvascular dysfunction or from inflammatory processes. Diagnosis is clinical, supported by patient history, physical exam, and exclusion of mimicking conditions like cellulitis, Raynaud’s phenomenon, or peripheral neuropathy.

Management is challenging and varies greatly between individuals. Treatment typically focuses on symptom control and addressing underlying conditions if present. Common strategies include topical agents (lidocaine, capsaicin), oral medications (gabapentin, antidepressants, sodium channel blockers), and lifestyle modifications like avoiding heat exposure and elevating limbs. In severe refractory cases, more aggressive treatments like intravenous infusions, nerve blocks, or even sympathectomy may be considered. Because of the condition’s complexity and variability, a multidisciplinary approach—often involving neurologists, dermatologists, and pain specialists—is usually the most effective route for patient care.

Useful Resources:
https://podiatryarena.com/index.php?threads/erythromelalgia.110532/
https://podiapaedia.org/wiki/peripheral-vascular-disease/erythromelalgia/
https://themedicaldispatch.com/understanding-and-diagnosing-an-inherited-pain-syndrome/
https://articles.abilogic.com/539981/what-erythromelalgia.html
http://www.podiatryabc.com/e-is-for-erythromelalgia/
https://podiatryfaq.com/knowledge-base/what-is-erythromelalgia/
http://foot-health-forum.com/index.php?threads/erythromelalgia.125437/
https://footproblemsandthekitchensink.com/erythromelalgia-affecting-the-foot-throw-the-kitchen-sink-at-erythromelalgia/