Diarrhea is loose, watery, and frequent stools. Diarrhea is considered chronic (ongoing or prolonged) when you have had loose or frequent stools longer than 4 weeks.

Diarrhea in adults is usually mild and resolves quickly without complication.
In infants and children (especially under age 3), diarrhea is more concerning. Children can become dehydrated fairly quickly.

The most common cause of diarrhea is a mild viral infection that resolves on its own within a few days. This is called viral gastroenteritis or "stomach flu." Viral gastroenteritis often appears in mini-epidemics in schools, neighborhoods, or families.

Food poisoning and traveler's diarrhea are two other common causes. They occur from eating food or drinking water contaminated with bacteria or parasites.

Certain medical conditions can lead to diarrhea.
Medications can also cause diarrhea, especially antibiotics, laxatives containing magnesium, and chemotherapy.

Home Care
Drink plenty of fluid to avoid becoming dehydrated. Start with sips of any fluid other than caffeinated beverages. Milk may prolong loose stools, but also provides needed fluids and nourishment. Drinking milk may be fine for mild diarrhea. For moderate and severe diarrhea, electrolyte solutions available in drugstores are usually best.
Active cultures of beneficial bacteria (probiotics) make diarrhea less severe and shorten its duration. Probiotics can be found in yogurt with active or live cultures and in supplements.
Foods like rice, dry toast, and bananas may help some.
Avoid over-the-counter diarrheal medications unless specifically instructed to use one by your doctor. Certain infections can be made worse by these drugs. When you have diarrhea, your body is trying to get rid of whatever food, virus, or other bug is causing it.
Rest.

If you have a chronic form of diarrhea, like irritable bowel syndrome, try adding bulk to your diet to thicken the stool and regulate bowel movements. Such foods include rice, bananas, and fiber from whole-wheat grains and bran.

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