And birth control pills tip the balance towards clotting because they increase the levels of clotting factors and decrease the levels of some anticoagulation factors like protein C and antithrombin.

而避孕药使得凝血功能亢进，因为避孕药增强了凝血因子的功能，降低了蛋白C及抗凝血酶等抗凝因子的功能。