It’s not yet clear how Trump will be treated for the condition, which was revealed on Thursday — but here’s what you need to know about the ailment.

President Donald Trump underwent vascular testing after he had swelling in his legs, with all results within normal limits, White House press secretary Karoline Leavitt said Thursday. Leavitt said Trump noted "mild swelling in his lower legs," which prompted the White House medical team to evaluate him.

Press secretary Karoline Leavitt said Trump noticed “mild swelling” in his lower legs and was evaluated by the White House medical unit.

President Trump underwent medical testing for “mild swelling” in his legs and bruising on his hand, which revealed a vein condition that is common in people over the age of 70, the White House said Thursday.