“Most people who have psoriatic arthritis find it occurs after developing skin psoriasis,” said the charity.
“But some do develop the arthritis before they notice any psoriasis on their skin.”
Affected joints may become tender, swollen and stiff, with symptoms tending to be worse first thing in the morning and with rest.
Exercise, however, can help to ease symptoms of the condition, which is an important part of any arthritis treatment plan.