Updated 15 February 2016

Sleep apnoea tied to gout flares

Sleep apnea may increase the risk of developing gout and experiencing flare-ups, according to a new study.


The intense pain and swelling of a joint, often a big toe, that marks gout is caused by the deposition of uric acid crystals in joints and tissues. Sleep apnea the study team notes, causes periods of oxygen deprivation during the night when people stop breathing, which triggers overproduction of uric acid in the bloodstream.

But little was known about the relationship Sleep apnea and gout, the study team writes in Arthritis and Rheumatology.

Read: Cherries may ward off gout

In 2007-2008, almost six percent of men and two percent of women in the U.S. experienced gout, according to the Centers for Disease Control and Prevention.

Sleep apnea, which is much more common, can increase the risk of high blood pressure, heart attack, stroke and heart failure, among other conditions, if untreated.

Obesity plays an important role in both sleep apnea and gout, but sleep apnea still increased the risk for gout even when weight was accounted for, said lead author Yuqing Zhang of Boston University Clinical Epidemiology Research and Training Unit.

The researchers used data on almost 10,000 people with a new diagnosis of sleep apnea from a U.K. database and compared them to more than 40,000 people of similar sex, age, birth year and body composition but without sleep apnea.

Read: Treatment for gout

Over a one-year period, there were 270 cases of gout, 76 in the sleep apnea group and 194 in the larger comparison group. Gout was diagnosed at an average age of 60.

Gout was almost twice as common in the sleep apnea group as in the comparison group, according to the analysis.

"When people have a gout attack it's so painful, they have limited mobility, they cannot put even one piece of paper on the toe," Zhang told Reuters Health.

Although obesity increases the risk for sleep apnea, some thin people have sleep apnea, too, and even in these people the risk of gout was increased by 80 percent, he said.

The next step is to test whether treating sleep apnea also reduces the risk for gout, which seems likely, he said.

"Some studies show that if you get treatment, your uric acid may go down," Zhang said.

Read: gout and your diet

Sleep apnea can be treated with lifestyle changes, such as losing weight or wearing mouthpieces or breathing devices at night, or with surgery.

It takes years for uric acid crystals to accumulate in the joints and lead to an eventual gout flare, so sleep apnea may not "cause" the gout, but may create a more ideal environment for a flare up, said Dr. Robert Thomas Keenan of Duke University School of Medicine in Durham, North Carolina, who was not part of the new study.

"Gout is the most common inflammatory arthritis in the western world," he told Reuters Health by email.

"Sleep apnea and gout risks can be reduced in many people by losing weight if they are overweight, eating healthy and indulging in alcohol and red meats in moderation," he said.

SOURCE: Arthritis and Rheumatology, online October 19, 2015.

Read more:

Coffee may fight gout

Sleep Apnea May Cause Night time Urination 

14 foods that cause gout


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Professor Asgar Ali Kalla completed his MBChB (Bachelor of Medicine and Bachelor of Surgery) degree in 1975 at the University of Cape Town and his FRCP in 2003 in London. Professor Ali Kalla is the Isaac Albow Chair of Rheumatology at the University of Cape Town and also the Head of Division of Rheumatology at Groote Schuur Hospital. He has participated in a number of clinical trials for rheumatology and is active in community outreach. Prof Ali Kalla is an expert in Arthritis for Health24.

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