Acid indigestion is an excess acid cognition in the stomach. It's excess acid backing up from the stomach area (due to acid-forming foods, i.e. meat, dairy products, refined grains, starches, etc.). To prevent this condition, neutralize the acidity with alkalinity in the form of green foods (green vegetables, green seaweeds) and alkaline substances (i.e. herbs, fruit, vegetables, alkaline water drops, etc.). Eat mostly green foods, fruits and vegetables and the condition will naturally subside. Please read "Alkaline vs. Acidity. Why Your Body’s pH Balance Matters.".