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What is erythromelalgia?

Erythromelalgia is a condition characterised by intense burning pain, erythema (marked redness), and increased skin temperature, primarily of the feet and hands. The condition is classified into primary and secondary erythromelalgia. It has also been classified into early-onset and late-onset forms. Symptoms of the disease vary markedly between individuals; in some patients there is a continual burning pain while others experience “flare-ups” or bouts of the condition lasting from minutes to days.

Erythromelalgia is also known as ‘erythermalgia’. It may be considered a type of neuropathic pain syndrome (pain related to conditions affecting the nerves themselves), where there is dilation of the small blood vessels that become congested with blood.

What causes erythromelalgia and who gets it?

The actual cause of erythromelalgia is unknown in most cases. Primary erythromelalgia develops spontaneously without any associated underlying disease associated, and is sometimes called ‘idiopathic erythromelalgia’. Secondary erythromelalgia develops secondarily to medical conditions such as neurological diseases (e.g. multiple sclerosis, peripheral neuropathy), autoimmune diseases (e.g. lupus, diabetes mellitus), or more commonly the myeloproliferative disorders. In these disorders the bone marrow produces excessive numbers of cells, e.g. polycythaemia vera (increased red cells), and essential thrombocythaemia (increased platelets). Erythromelalgia presents before the appearance of the myeloproliferative disorder in 85% of cases.

People with early-onset erythromelalgia develop it before they are 25. Although the disease is of unknown origin in most cases, sometimes it can be traced back through generations of a family (Weir-Mitchell disease). This has recently been shown to be due to mutations in a gene called Na(v)1.7., which encodes a sodium channel within certain cells.

Late-onset erythromelalgia occurs most often around 40-60 years of age and is primary in about 60% of cases.

What are the signs and symptoms?

Lower extremities such as the soles of feet and toes are most commonly involved. Rarely does the pain extend up to include the knees. Upper extremity involvement includes the fingers and hands. Often both feet and hands are involved and both sides of the body (bilateral) are affected. It may affect one side of the body (unilateral), particularly in secondary cases. Less frequently, symptoms may also appear in the face, ears and other parts of the body.

The classic description of erythromelalgia is red, painful, warm hands or feet, brought on by warming or hanging the limb downward, and relieved with cooling and elevation.

Symptoms often become so bad that normal functioning and quality of life are greatly affected. Patients avoid warm weather and may even relocate to cooler climates. Many cannot wear socks or closed shoes even in winter. Some patients become virtually housebound by continuous flare-ups and pain.

How is the diagnosis made?

Investigation for underlying causes is essential in all new cases of the disease. Erythromelalgia may be an early sign of polycythaemia or thrombocythaemia, where symptoms may precede diagnosis of the myeloproliferative disorder by 2.5 years. Dramatic relief with aspirin is typical of this type and can be used as an aid to diagnosis.

Diagnosis is based fairly much on the clinical picture, hence is often difficult because of the intermittent nature of the disease. Provided the patient gives a good description of their symptoms, a tentative diagnosis may be made. If in doubt, immersing an affected area in hot water for 10-30 minutes may sometimes provoke an attack.

When no known underlying cause has been found, the erythromelalgia is considered primary.

What treatment is available?

The underlying cause must be treated where possible in secondary erythromelalgia. The treatment of symptoms of both primary and secondary erythromelalgia is through general non-medical measures, drug therapy and surgical intervention.

Patients respond quite variably to drug therapy and no single therapy has proved consistently effective. Spontaneous remissions have also been known to occur.

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Author: Vanessa Ngan, staff writer

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