Pulmonary embolism: risk factors

 7 H's:
Hereditary (eg factor V Leyden, protein C or S deficiency)
History (previous DVT or PE)
Hypomobility (fracture, CVA, severe illness, obesity, long trip)
Hypovolaemia (nephrotic syndrome, dehydration)
Hypercoagulability (smoking, malignancy)
Hormones (oestrogens [esp. in OCP], puerperium)
Hyperhomocysteinaemia