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Burning sensation in stomach may be because of infection in stomach.
Gastritis may cause abdominal burning sensation.
Gastric ulcer may rule out.
Infection of H. pylori is most common in stomach.
More amount of taking NSAIDS may cause abdominal problems.
Too fatty food, spicy foods, oily foods may cause burning sensation in stomach.
Stressful condition may cause abdominal burning sensation.
Alcohol drinking and
smoking may affect stomach.
Celiac disease,crohn's disease like intestine infection may cause burning sensation.
Stool examination test is helpful for diagnose.
Endoscopy is helpful for further diagnosis.
I hope my guidance is helpful to you.
Thank you very much.