A 37-year-old obese woman (BMI=44.3) presented with disturbed consciousness, severe diarrhea and tachypnea. Physical examination revealed clear breathing sounds and a soft abdomen. She was initially treated as AGE and later a case of pulmonary embolism was suspected due to a high level of D-dimer. However the clinical presentation and the blood gas readings did not support a diagnosis of pulmonary embolism. Unstable hemodynamics developed within one hour. Emergency abdominal and pelvic computed tomography showed that this was a case of internal bleeding of unknown origin. Subsequently, the patient was subjected to laparotomy and a ruptured intratubal pregnancy was evacuated. She was discharged 5 days after admission as well and the recovery was still favorable at the 2 months follow-up.