The following causes of Internal bleeding are ones for which we do not have any prevalence information. 1  Anticoagulant use. 2  Bleeding peptic ulcer. 3  Concealed abruption-in pregnancy. 4  DIC. 5  Drug overdose-internal bleeding. 6  Drug poisoning-internal bleeding. 7  Hepatoma-internal bleeding. 8  Intestinal venous malformatiuon.