Virchow's triad

Virchow's triad refers to three factors that Rudolf Virchow suggested predisposed a patient to developing venous thrombosis

1. local trauma to the vessel wall
2. stasis (of blood flow)
3. hypercoagulability (of the blood)

Stated another way, they are: i) trouble with the vessel ii) trouble with the flow iii) trouble with the blood itself.