My father used to get a burning sensation in stomach. Initially, we ignored this as we thought that this must be because of the too spicy food...but the situation got worsened with chronic abdominal pain. After few tests, he realized that he had Gastritis. I think it was because of the habit of pain-relievers and smoking. After few months of medication and a proper diet, he was recovered from that. Gastritis causes inflammation of the stomach lining and one should know the cause of this inflammation. Because, if it is chronic then it may develop a stomach cancer.