[jayswin]

Yeah, google is pretty much saying it could be bad.

uh oh

Bleeding esophageal varices occur when swollen veins (varices) in your lower esophagus, the muscular tube that connects your mouth with your stomach, rupture and bleed due to excess pressure. This condition is a medical emergency and must be dealt with promptly

uh oh

Gastritis is inflammation in the protective lining of the stomach. Acute gastritis involves sudden, severe inflammation, while chronic gastritis involves long-term inflammation that can last for years, if left untreated. A less common form of the condition, erosive gastritis, typically doesn’t cause much inflammation but can lead to bleeding and ulcers in the lining of the stomach

uh oh

Intussusception occurs when a one part of the intestine folds into another part. This causes a blockage in the intestine. The blockage prevents food and waste from properly moving through. Intussusception can occur any place in the intestinal tract, but it is most common where the small and large intestines meet.
Intussusception, also called bowel obstruction, is a potentially life-threatening condition.

Haha, it's a little unnerving when almost every possible cause of "throwing up blood" has a big header that says "This is potentially life threatening".