People experiencing problems in their upper gastrointestinal (GI) tract may need an endoscopy, or an examination of those organs, including the esophagus, duodenum and stomach.

Carbonation may cause increased gas in your digestive system that may result in pain, bloating and cramping. If you’re sensitive to gas-forming foods, such as broccoli, onions and beans, you should avoid consuming soda beverages.

Drinking alcohol will not cause lactose intolerance symptoms unless the alcoholic beverage contains dairy. Some alcoholic beverages, such as pina coladas, white Russians and cream liquors contain dairy, which means they also contain lactose.

Ulcers are crater-like lesions on the skin or the mucous membrane that may affect any part of the body including mouth, stomach, skin and intestinal tract. Along with a burning pain, ulcers can also lead to nausea, vomiting, loss of appetite and blood in vomit of stool.

Abdominal pain can be caused by a variety of triggers, and often you only need to look to your last meal to figure out what is causing your cramps. According to the website Ask Dr. Sears, consuming fish is a common cause of stomach cramps, particularly in children.

Large meals and certain foods can make you feel lethargic, gassy and bloated. Bloating is when your stomach looks and feels full and tight. According to nutrition educator Roseanna Lee, this condition typically occurs when you have too much water and gas in your body.

Hemorrhoids affect over 1 million people in the Western world each year. They are much less common in underdeveloped countries, which is likely due to the high-fat, low-fiber diet that is more popular in Westernized countries.

Mineral oil is a petroleum-based liquid used as an ingredient in some medications and diaper rash creams. According to a 2001 article published in the journal "Paedriatrics & Child Health," mineral oil is also considered an effective treatment for constipation.

Nausea , or the feeling of stomach sickness including an urge to vomit, can often be accompanied by other gastrointestinal symptoms such as diarrhea. These two symptoms are a relatively common experience for most people and are usually minor annoyances that go away on their own within one to three days.

Abdominal cramps are common, as most people will experience them at one time or another. Abdominal cramps are sharp pains in the stomach and lower abdominal area. If the pain is severe enough to prompt a visit to the doctor, most people describe it as a stomach ache--or, for children, a tummy ache.

If you suffer from gastritis, your stomach lining is inflamed and you make less acid, enzymes and mucus. Acid and enzymes help you break down food and mucus protects your stomach from acid. Gastritis can be acute or chronic and may result in stomach bleeding, erosion and ulcers.

While probiotics are generally well tolerated, including probiotic-rich foods or adding probiotic supplements might infrequently cause side effects. Although diarrhea is not a typical side effect, probiotics can sometimes cause related symptoms such as abdominal discomfort, bloating or gas.