Often times bleeding in organs may be difficult to recognize as it may manifest as nausea, irritability, malaise and hopefully pain to alert the patient. In the brain, bleeding typically leads to "the worst headache of their lives" associated with vomiting without diarrhea. Bleeding in the kidneys usually causes significant back or side pain and may lead to trouble urinating or dark or bloody urine. Bleeding in the stomach may lead to nausea and vomiting with "coffee ground" appearing vomit or vomit containing blood.