Hemorrhage refers to the escape of blood from the circulatory system, which can occur either internally or externally. It is a critical medical condition that can result from various factors, including injury, disease, or complications from medical procedures. Understanding hemorrhage is essential when discussing anticoagulants, antiplatelet agents, and thrombolytics, as these medications can either increase the risk of bleeding or be used to manage thrombotic events that lead to clot formation and subsequent complications.