Although there’s no sure reason why these conditions go hand-in-hand, researchers are looking for the links that bind them. The connection may be inflammation, says Eric Matteson, MD. He's the rheumatology chair at Mayo Clinic in Rochester, MN.
“Some treatments used to treat psoriatic arthritis, such as corticosteroids, potentially lead to weight gain as well as heart disease risk,” says Jasvinder Singh, MD. He's a rheumatologist and associate professor of medicine at the University of Alabama in Birmingham.
Severe pain and limited movements can also lead to a higher risk of obesity.
Diabetes, a long-term disease marked by high blood sugar, happens in nearly 20% of people with psoriatic arthritis. The two share obesity as a risk factor. On top of that, says Matteson, the drugs used to treat psoriatic arthritis make you more likely to get diabetes.