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Erythromelalgia is a rare disorder that causes episodes of burning pain and redness in the hands and feet, and sometimes the arms, legs, ears and face.
Cooling the skin or raising the affected hands or feet may reduce the pain.
Symptoms can begin at any age. Some people with erythromelalgia may have had it from early childhood, while some are just affected in adult life.
People with erythromelalgia typically suffer episodes or flare-ups of severe pain lasting from a few minutes to days.
Flare-ups usually start as an itching sensation, which worsens to a severe burning pain and tender, mottled red skin.
The hands and feet are most commonly affected, usually on both sides of the body, but erythromelalgia can also affect the arms, legs, ears and face.
The pain can be severe enough to make walking, standing, socialising, exercising and sleeping difficult. It can have a significant impact on work or school life.
Symptoms are usually triggered by an increase in body temperature.
They can start after exercising, wearing warm socks, gloves or tight shoes, entering a warm room, being dehydrated, or even consuming alcohol or spicy food.
For most people with erythromelalgia, the cause is unknown.
However, in some cases, an underlying cause may be found – usually a medical condition or a faulty gene.
Erythromelalgia sometimes results from an underlying disease, such as:
It may also result from certain medications, such as verapamil or nifedipine.
In some people with erythromelalgia, the disease is caused by a change (mutation) in a gene. This may have occurred spontaneously or been inherited from a parent, meaning that erythromelalgia can run in the family.
Genes contain the genetic information, or the "instructions", to make a particular protein in the body. Genetic mutations occur when DNA changes, altering the genetic instructions.
Erythromelalgia can be caused by changes in the SCN9A gene that provides the instructions for a sodium channel in pain nerves.
Changes in sodium channels can lead to them opening more easily and staying open longer than usual. This increases or amplifies pain signals.
It is not currently understood why the hands and feet are affected the most.
Cooling the skin with a fan or cold water, or raising the affected hands or feet may relieve the pain.
However, using ice or soaking the hands or feet for long amounts of time isn't recommended, as this can lead to hypothermia or damage to the skin, causing ulcers.
There's also a risk that the change in temperature will trigger a reactive flare-up when the hands or feet are removed.
Even though a cool environment is helpful in reducing pain during attacks, the use of cold baths or showers is generally discouraged because of potential skin damage.
A number of different medications have shown potential in relieving symptoms, although no single drug helps everyone. Different treatments often need to be tried under the supervision of experienced clinicians, and combinations of different medicines are sometimes needed.
Your doctor will discuss treatment options with you, as this will also depend on the type or erythromelalgia you have. Many treatments require referral to a specialist centre so that benefits and potential side effects can be closely monitored.
Drugs used for other types of nerve pain may reduce symptoms. This includes anti-epilepsy drugs such as gabapentin, or low doses of tricyclic antidepressants such as amitriptyline, which can be effective in treating pain caused by increased sensitivity or damage to the nervous system.
Drugs used for high blood pressure or Raynaud's disease can encourage the blood vessels to widen, and may be beneficial in some types of erythromelalgia.
In adults, aspirin may relieve symptoms if the cause is an abnormally high number of blood cells (aspirin is not recommended for children).
In some cases, when pain has not been controlled by medication taken by mouth (orally), an intravenous infusion (when medicine is given directly into your bloodstream via a drip) may be used.
Lidocaine – a local anaesthetic that blocks sodium channels and can help nerve-related pain – may be given this way, but how long it works for varies. Your doctor will explain the procedure to you and how you should prepare for it.
Great Ormond Street Hospital for Children Pain Control Service Clinical Lead for Pain Management Department of Anaesthesia and Pain Medicine Level 4, Paul O’Gorman Building London, WC1N 3JH Email: email@example.com Fax: 020 7242 4901
Pain Management Centre National Hospital for Neurology and Neurosurgery Internal Mailbox 145 Queen Square London, WC1N 3BG Fax: 020 3448 3511 (internal: 83511) Online referrals are preferred for adult cases – see the website for a referral form.
Important: Our website provides useful information but is not a substitute for medical advice. You should always seek the advice of your doctor when making decisions about your health.