Chronic venous insufficiency, or CVI, happens when veins in the legs can’t properly carry blood back to the heart. That can lead to blood pooling in the lower legs.

President Donald Trump was examined for swelling in his legs and has been diagnosed with chronic venous insufficiency, the White House announced Thursday.

President Donald Trump has been diagnosed with chronic venous insufficiency, the White House announced on Thursday. Here's what to know about the condition.