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//40%// of patients diagnosed with PE have no major risk factors.
Common predisposing factors include //malignancy, pregnancy and post-op//
comprehensive list 2010 SIGN 

''General''
|increased risk with advancing age|immobility|
|obesity|hospitalisation|
|family history of VTE|anaesthesia|
|pregnancy (especially puerperium)|central venous catheter: femoral >> subclavian|

''Underlying conditions''
|malignancy|heart failure|nephrotic syndrome|
|thrombophilia: e.g. Activated protein C resistance, protein C and S deficiency|antiphospholipid syndrome|hyperviscosity syndrome|
|Behcet's|polycythaemia|sickle cell disease|
|paroxysmal nocturnal haemoglobinuria|homocystinuria||

''Medication''
COCP 3rd>2nd
HRT esp if OandP (not just O) 
raloxifene and tamoxifen
antipsychotics (especially olanzapine)