Persistent burning or gnawing stomach pain
Pain that improves or worsens with eating
Bloating or frequent burping
Nausea or vomiting
Loss of appetite
Unexplained weight loss
Black, tarry stools
Vomiting blood or material that looks like coffee grounds
Feeling weak, dizzy, or faint
Symptoms that keep returning over time
Endoscopy
H. pylori testing
Stool test for hidden blood
Blood tests for anemia or infection
Imaging tests if complications are suspected