Doctors discuss how common the condition is, why it happens — and whether Trump's symptoms align with his diagnosis.

The White House said on Thursday that U.S. President Donald Trump is experiencing swelling in his lower legs and bruising on his right hand, after photographs emerged of Trump with swollen ankles and makeup covering the afflicted part of his hand.

Leavitt said Trump noted "mild swelling in his lower legs," which prompted the White House medical team to evaluate him. They concluded that Trump has chronic venous insufficiency -- a condition in which there isn't adequate blood flow in the veins in the legs. This can cause the blood to pool, causing swelling in the lower legs.