Because lettuce is such a bland food, it may seem unlikely that it would cause stomach pain. However, lettuce is considered a gas-forming food. Eating lettuce increases your chances of developing bloating, gas pain and belching.

No matter what the cause, when you're feeling sick to your stomach, eating may be the furthest thing from your mind. If your doctor says it's alright to try to eat despite your difficulty holding down foods, there are some steps you can take to help increase your intake while decreasing your risk of dehydration.

Peptic ulcers are erosions of the tissues lining the upper digestive tract, particularly the stomach and first portion of the small intestine, the duodenum. They are often caused by a bacterial infection that compromises your defense against the acid produced in the stomach.

If you’ve been diagnosed with lactose intolerance, you can still enjoy pizza, although it contains lactose from the cheese. Cheeses tend to have less lactose than other dairy products because of the enzymes used to create cheese.

Pineapple is a tropical fruit grown in warm climates and has a flavor that is both sweet and tart. Enjoying a serving of pineapple helps improve digestion by providing fiber and a certain type of digestive enzyme.

Laxatives are substances typically used to relieve constipation in people unable to achieve regular bowel movements. According to the Mayo Clinic, normal bowel movements vary among individuals but generally range from one to three per day.

Any food can trigger symptoms in those who suffer from irritable bowel syndrome, but peanuts will not cause IBS or diarrhea, unless you’re allergic or have a food intolerance. Any time you develop gastrointestinal symptoms, such as diarrhea after eating peanuts, you need to call your doctor.

Catfish makes regular appearances in many Americans' diets, and serves as a good source of omega-3 fatty acids, an important fatty acid for the body.

A hernia is characterized by the protrusion of an internal organ or a body part through an opening into an area where the organ or body part is not normally present. The opening results from weakness in the tissue, muscle or membrane that normally holds the organ or body part in place.

Stomach gas is the cause of pain in your baby's belly, which can sometimes result in discomfort, flatulence and colic symptoms. While gas, specifically gas after eating, is common in babies, it can still be the sign of a more serious condition. To properly deal with baby gas, you must first understand the causes.

Sometimes what you eat just doesn't agree with you, leading to uncomfortable fullness, bloating or a burning sensation behind your breastbone. Overfilling your stomach, eating quickly or feeling anxious frequently provokes these symptoms.

The average person may not experience heartburn as often as pregnant women and older adults, but it’s still one of the most common digestive complaints. A random bout of heartburn can usually be linked to something specific, such as a large meal, a spicy dish or too much caffeine.