If you have diarrhea, changing your diet may improve your symptoms. Traditional advice is to consume bland, soft foods to manage brief episodes of diarrhea, although getting enough fluids and resuming a normal diet are most consistent with evidence-based guidelines.

Lactaid milk contains enzymes that break down lactose, the sugar in milk that breaks down into two other sugars, glucose and galactose. People with lactose intolerance don’t produce enough lactase enzymes, which break down lactose in simple sugars so it can be digested and used in the body.

Acid reflux can occur by itself or with a variety of other symptoms. Complaints of heartburn, coughing, bloating or nausea are possible in people who experience acid reflux. While any severe or frequent reflux-associated symptoms should be brought to your doctor’s attention, this is especially true for stomach pain.

Facial redness after you eat or when it’s hot is called facial flushing. Skin flushing causes your skin to turn bright red in various parts of your body, and the face is a common place to develop flushing.

The acid/base balance is expressed in terms of pH. An acidic environment has a pH of less than 7.4, whereas a basic or alkaline setting has a pH of greater than 7.4. Molecules that give off hydrogen maintain an acidic pH. In contrast, alkaline molecules attract hydrogen.

Gastroesophogeal Reflux Disease (GERD), also known as Acid Reflux or "heartburn," is a common problem affecting 10 to 20 percent of the population in the United States.

Nausea is a sensation of illness that causes vomiting, which is a forceful action that brings the stomach contents up through the esophagus and out of the mouth. Coughing is a forceful movement that removes substances from the airways.

With aging, the large intestine or colon may develop small pockets known as diverticulae -- or a single diverticulum, if you develop just one pocket. Doctors call this medical condition diverticulosis. Most people with diverticulosis never develop symptoms.

During pregnancy, women often notice a variety of digestive sensations and discomforts. Because pregnancy changes the rate at which your digestive tract processes food, you may experience symptoms that lead you to believe you've become lactose-intolerant.

Peptic ulcers are lesions in the lining of your stomach and duodenum, or the upper part of your small intestine, according to Dr. James Balch and Mark Stengler, authors of "Prescription for Natural Cures."

Described by Medline Plus, the large intestine is composed of five segments: the cecum, ascending colon, transverse colon, descending colon and the sigmoid colon. The primary function of the large intestine is to absorb the remaining water from the stool before elimination.

Lactose, commonly called milk sugar, is the primary sugar in dairy products such as milk, cheese and yogurt. It makes dairy products taste mildly sweet and is a significant source of calories. Lactose is readily metabolized into simpler sugars and absorbed in your intestines if you produce enough enzymes.