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

U.S. President Donald Trump has been diagnosed with a "common" vein condition after being evaluated by his doctor over swelling in his lower legs, the White House said on Thursday.

Leavitt said Trump's bruised hand was consistent with "tissue damage from frequent handshaking" while taking aspirin, which she said is "part of a standard cardio-vascular prevention regimen".