The rationale of thromboprophylaxis stems from the high incidence of venous thromboembolism (VTE) in hospitalized patients, the clinically silent nature of this entity in a vast majority of patients, and the morbidity and potential mortality that can often be associated with it. There are few specific symptoms associated with deep vein thrombosis (DVT) and VTE, thus making clinical diagnosis unreliable. Making appropriate diagnosis and implementing treatment of DVT prior to a potentially fatal embolic event or the potential sequelae and long-term morbidity of the postphlebitic syndrome is a difficult task in any hospitalized patient. In the setting of trauma, however, diagnosis, prevention, and treatment of DVT and VTE become much more difficult.Objectives: Upon completion of this article, the reader will understand the pathophysiology, diagnosis, and treatment options concerning venous thromboembolic disease. Accreditation: Tufts University School of Medicine (TUSM) is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. TUSM takes responsibility for the content, quality, and scientific integrity of this CME activity. Credit: TUSM designates this educational activity for a maximum of 1 Category 1 credit toward the AMA Physicians Recognition Award. Each physician should claim only those credits that he/she actually spent in the activity.