Why do l experience indegestion?

Many reasons: You may be eating too fast, have an infection, hiatal hernia, on Aspirin or other drug, stress, spicy foods, etc. More info is needed. When did it start? When does it happen? After meals or middle of night? If the problem persists, you can try omeprazole, an over the counter drug for a few weeks. If it doesn't get better, see a doctor for complete evaluation.