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Thrombosis

vascular disease caused by the formation of a blood clot inside a blood vessel, obstructing the flow of blood through the circulatory system

Thrombosis (Greek: θρόμβωσις) is the formation of a blood clot (thrombus; Greek: θρόμβος) inside a blood vessel, blocking the flow of blood through the circulatory system. When a blood vessel is injured, the body uses platelets (thrombocytes) and fibrin to form a blood clot to prevent blood loss.