When performing any type of surgery, the surgeon must be cognizant of hidden bleeding. In the case presented, Le Fort I osteotomy is perfgormed to correct a disharmonious maxilomandibular relationship of a 19-year-old man with diabetes insipidus. Postoperatively, excessive bleeding is seen at the surgical site, IV catheter insertion area, and rectum. It was later determined that the blood originated from the oral structure and traveled through the stomach and rectu. Examination of the blood revealed disseminated intravascular coagulation.