Blood clots are clumps that occur when blood hardens from a liquid to a solid.
A thrombus or embolus can partly or completely block the flow of blood in a blood vessel.
Clot; Emboli; Thrombi; Thromboembolus; Hypercoagulable state
Situations in which a blood clot is more likely to form in veins include:
Blood clots are also more likely to form after an injury. People with cancer, obesity, and liver or kidney disease are also prone to blood clots.
Smoking also increases the risk of forming blood clots.
Conditions that are passed down through families (inherited) may make you more likely to form abnormal blood clots. Inherited conditions that affect clotting are:
Other rare conditions, such as protein C, protein S, and antithrombin III deficiencies.
A blood clot may block an artery or vein in the heart, affecting the:
Anderson JA, Hogg KE, Weitz JI. Hypercoagulable states. In: Hoffman R, Benz EJ, Silberstein LE, et al, eds. Hematology: Basic Principles and Practice. 7th ed. Philadelphia, PA: Elsevier; 2018:chap 140.
Schafer AI. Thrombotic disorders: hypercoagulable states. In: Goldman L, Schafer AI, eds. Goldman-Cecil Medicine. 25th ed. Philadelphia, PA: Elsevier Saunders; 2016:chap 176.