The White House on Thursday said President Trump underwent medical testing due to “mild swelling” in his legs, unveiling a vein condition that is common in those older than 70.

In a press briefing, White House press secretary Karoline Leavitt shared a note from Trump’s physician that described the exam. The president went through ultrasounds and a “comprehensive exam,” which included a diagnostic vascular study.

The exam found that the president, who is 79, has chronic venous insufficiency. The condition occurs when someone’s leg veins have a difficult time pumping blood back to the heart, causing blood to pool, according to the Cleveland Clinic.

Here are five things to know about the president’s chronic venous insufficiency:

Chronic venous insufficiency is a common condition

According to Cleveland Clinic, about 5 percent of adults experience chronic venous insufficiency, with those 50 and older generally being impacted by it.

Johns Hopkins University also

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