1. Obesity has long been regarded as a risk factor for venous thrombosis . 2. While he was in hospital, he suffered from a venous thrombosis . 3. Factor V Leiden increases the risk of venous thrombosis by two known mechanisms. 4. Pregnancy in itself causes approximately a five-fold increased risk of deep venous thrombosis . 5. This mutation is also the most common hereditary risk for venous thrombosis among Caucasians. 6. Other mutations of factor V are associated with venous thrombosis . 7. This may arise from a deep venous thrombosis , especially after a period of immobility. 8. Ovarian vein dilatation might also follow venous thrombosis ( clotting inside the vein ). 9. Cerebral venous thrombosis , an uncommon form of stroke, is more common in those with PNH. 10. It is unclear whether these individuals are at increased risk for " recurrent " venous thrombosis .
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