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Causes of Thrombosis血栓形成的原因

In general, thrombosis seldom occurs in a healthy artery, because the smooth inner lining prevents the clot from forming.在一般，血栓形成，很少发生在一个健康的动脉，因为顺利内衬，防止血栓的形成。 Injury to a blood vessel, or any disease process affecting the smoothness of the inner lining, can start the process of thrombosis.损伤的血管，或任何疾病的过程中影响的光滑内衬，可以启动的过程中血栓形成。

The commonest cause of thrombosis in arteries is atherosclerosis (see article on Atherosclerosis).最常见的原因，在动脉血栓形成是动脉粥样硬化（见文章对动脉粥样硬化） 。 Atherosclerosis causes strokes and heart attacks and is now the number one killer of the Western world.动脉粥样硬化的原因，中风和心脏病发作和现在是头号杀手，对西方世界。 Atherosclerosis causes rough, raised plaques (which contain cholesterol) on the inner lining of arteries.动脉粥样硬化的原因粗糙，所提出的斑块（其中包含胆固醇）对内衬的动脉。 These eventually tear, and the thrombosis starts to build up where the plaques are torn.这些最终撕裂，血栓开始建立的地方斑块被拆除。

Even when arteries are normal, a clotting tendency can result from hormonal or biochemical changes in the blood.甚至当动脉是正常的，一血块倾向的结果，可以从荷尔蒙或生化变化在血液中。 The tendency to thrombosis in arteries may be greater during pregnancy, in women using oral contraceptives, in people with cancer that has affected blood vessels, and in people whose blood is thicker than normal (those with polycythaemia, which means there are too many cells in the blood).倾向在动脉血栓的可能更大在怀孕期间，妇女在使用口服避孕药，在人与癌症有受影响的血管，并在人的血液是较厚，较正常（那些与polycythaemia ，这意味着有太多的细胞在血） 。

Thrombosis in veins is encouraged by local pressure, inflammation (thrombophlebitis) and stagnation of blood flow through inactivity.在静脉血栓是鼓励本地的压力，炎症（血栓）和停滞的血流量通过闲置。