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This information is provided by an independent source. Merck & Co., Inc. is not responsible for this content. Please discuss any and all treatment options with your healthcare professional. The manufacturer of a product generally has the most complete information about that product.

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thrombosis (throm-bo´sis) formation, development, or presence of a thrombus; it can happen whenever the flow of blood in arteries or veins is interfered with. Many factors can cause this; heart failure or physical inactivity may retard circulation generally; a change in the shape or inner surface of a vessel wall may impede blood flow (as in atherosclerosis); a mass may grow inside the body and exert pressure on a vessel; the vessel wall may be injured and roughened by an accident, surgery, a burn, cold, inflammation, or infection; or the blood may thicken in reaction to the presence of a foreign serum or snake venom. Sometimes a thrombus detaches itself from the wall and is carried along by the bloodstream; then it is known as an embolus, and the condition is known as embolism. adj., thrombot´ic., adj.

cerebral thrombosis thrombosis in a cerebral artery, which may cause stroke syndrome.

coronary thrombosis thrombosis in a coronary artery, which may cause myocardial infarction.

deep vein thrombosis(DVT) , deep venous thrombosis thrombosis of one or more deep veins, usually of the lower limb, with swelling, warmth, and erythema, frequently a precursor of pulmonary embolism.

venous thrombosis phlebothrombosis.

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