Burning or gnawing pain in the upper abdomen
Pain that may improve or worsen after eating
Feeling full quickly
Bloating
Frequent burping
Nausea
Vomiting
Loss of appetite
Unexplained weight loss
Dark, tarry stools
Vomit that looks like blood or coffee grounds
Fatigue or weakness
Severe sudden abdominal pain
Symptoms that persist or keep coming back