Abdominal Bleeding
Abdominal bleeding—which occurs in the stomach, esophagus, colon, and small bowel—can be incredibly hard to diagnose because some of the primary symptoms are being weak and light-headed from a drop-in blood pressure and rise in heart rate, says AARP. Plenty of people head into the emergency room with those same symptoms, and if the right testing isn’t done to detect the internal bleeding, things could end badly.