Abstract
The epidemiology of venous thromboembolism was reviewed including estimates of incidence and prevalence of venous thrombosis and its sequelae, a discussion of geographical, annual and seasonal variations, and data concerning possible risk factors. Selection of patients at increased risk for development of deep venous thrombosis or pulmonary embolism, for specific diagnostic screening or prophylactic therapy with low-dose heparin, may be a more effective approach to lowering morbidity and mortality from this disease.