There are a variety of non-prescription pain relievers that are available in the marketplace. However, certain of them may cause problems for your digestive tract. For instance, aspirin may alter the lining of the stomach, which can cause uncomfortable belly discomfort. Ibuprofen and naproxen may also create problems in the digestive system, which is why it is important to select the best tablets for stomach pain with care. It is also possible to consume the medication in conjunction with food.