We report on a 43-year-old female patient with multiple thrombotic risk factors who, in a few months, developed acute myocardial infarction, an ischemic cerebrovascular event and variceal bleeding due to portal vein thrombosis. The factor V Leiden mutation was carried in heterozygous form, homocysteine was elevated at 19.6 micromol/l, and methylenetetrahydrofolate reductase C677T mutation was carried in homozygous form. Moderately increased plasma homocysteine level and a reduced protein S activity were evident. Anticardiolipin IgG antibodies were mildly positive. We conclude that the presence of multiple genetic and environmental risk factors greatly amplifies the risk of clinical thrombotic events.