What is the chronic venous insufficiency diagnosed in Trump?

This Thursday, the White House reported that the President of the United States, Donald Trump, He was diagnosed with chronic venous insufficiency after undergoing a medical examination for swelling in his legs.
In some images on social media, swelling in the Republican president's legs can be seen, so it is now known that he has this condition.

According to the Cleveland Clinic, a nonprofit multi-specialty academic medical center with locations across the United States, Chronic venous insufficiency (CVI) occurs when the veins in the legs become damaged and cannot function properly.
Normally, the valves in the leg veins maintain blood flow back to the heart . However, CVI damages these valves, causing blood to pool in the legs. This increases pressure in the leg veins and causes symptoms such as swelling and ulcers.
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