Depending on what's causing your indigestion, you may experience abdominal pain, bloating (full feeling), belching and gas, nausea, vomiting, and acidic taste in your mouth, 'growling' stomach, and even diarrhea. Symptoms usually get worse when you're stressed but normally go away in a few hours. Indigestion can be linked to more serious chronic conditions, including ulcers, pancreas abnormalities, or acid reflux disease. Speak to your doctor if your symptoms are severe or last for more than two weeks.