06/05/2026
Blood clots help stop bleeding when you're injured, but when they form inside a blood vessel, they can become a serious medical emergency. Some blood clots can travel to the lungs, heart or brain and block blood flow.
Learn common risk factors for blood clots, warning signs to watch for and when symptoms require immediate medical attention.
A blood clot is a mass of blood that can clump in veins, the heart and the lungs. Blood clots can be dangerous. Know the signs and get treatment right away.