Deep-vein thrombosis (DVT, also known as “economy-class syndrome”) is when blood clots form in a deep vein, such as in the legs or pelvis. This creates a risk that a clot will break off and travel to the lungs, blocking one of the blood vessels there. In short, it can kill you.
It is believed to be commonly caused by a combination of dehydration and sitting still for prolonged periods of time. Unfortunately, these are conditions frequently experienced by many gamers, and has resulted in at least one death, in a syndrome dubbed “e-thrombosis”. As the article over at PC Games N explains, it’s important for gamers to be aware of the risks, and to take some (very minor) precautions such as drinking regularly, and taking breaks every 90 minutes or so.