In just the last two months, both Damian Lillard of the Milwaukee Bucks and the San Antonio Spurs' Victor Wembanyama were diagnosed with deep vein thrombosis. Wembanyama's clot was discovered in ...

It's called deep vein thrombosis, or DVT. All our veins have small valves powered by the muscles around them. They keep blood moving toward the heart, instead of flowing backward inside veins.

When a blood clot forms in a vein deep inside your body, it causes what doctors call deep vein thrombosis (DVT).