Diarrhea is frequent, soft or loose bowel movements (poop). Most people get diarrhea
from time to time. It usually doesn't last long and often gets better on its own.
What Causes Diarrhea?
Diarrhea is usually caused by an infection in the intestines. The germs
that cause the infection are:
viruses (most common)
Viral gastroenteritis (the "stomach flu") is a common illness. It causes diarrhea
and, often, nausea and vomiting. The symptoms usually last a few days. The viruses
that cause viral gastroenteritis can pass through a household (or a college dorm or
other place where lots of people live together) quickly because they're highly infectious.
Luckily, the diarrhea usually goes away on its own in a few days. For healthy teens
and adults, viral gastroenteritis is a common but minor inconvenience. But for little
kids and people with chronic illnesses, it can lead to dehydration that needs medical
In developed countries like the United States, outbreaks of diarrhea are most often
due to what we call food
poisoning. Food poisoning happens when toxins are made by bacteria in food that
isn't handled, stored, or cooked safely.
The Giardia parasite spreads easily through contaminated water and human
contact. This parasite can spread in water parks and pools because it is resistant
to chlorine treatment. Bathing in and drinking water from contaminated streams or
lakes can lead to an infection and chronic diarrhea. Infants in childcare settings
can become infected with Giardia and bring the parasite home, causing diarrhea in
Another parasite, Cryptosporidium, is a common culprit behind diarrhea
epidemics in childcare centers and other public places. Cryptosporidium often causes
watery diarrhea that can last for 2 weeks or more.
People often get crampy belly pain first, followed by diarrhea that can last 3–5
days. Other symptoms may include:
loss of appetite
nausea (uncomfortable feeling before vomiting)
How Is Diarrhea Treated?
Most infections that cause diarrhea, especially viral infections, will go away
without treatment. Taking it easy at home and drinking plenty of fluids to avoid dehydration are the best ways
to ride out the illness. If you do become dehydrated, you might need to go to the
hospital for intravenous (IV) fluids to replace those lost to diarrhea, vomiting,
If you go to your doctor, you may give a stool sample so he or she can find out
what type of infection you have. Whether you need medicine will depend on which germ
is causing the illness. A parasitic infection will be treated with anti-parasitic
medicine. Sometimes, diarrhea caused by bacteria is treated with antibiotics to prevent
the infection from spreading throughout the body.
How Can Diarrhea Be Prevented?
It's almost impossible to prevent all cases diarrhea. But there are some ways to
make it less likely:
Wash your hands well
and often, especially after using the toilet and before eating. Hand washing is the
best way to prevent diarrheal infections that pass from person to person.
Keep bathroom surfaces like sinks and toilets clean.
Wash fruits and vegetables well before eating.
Clean kitchen counters and cooking utensils well after they've been in contact
with raw meat, especially poultry.
Refrigerate meats as
soon as possible after bringing them home from the store. Cook them until they're
no longer pink. Refrigerate all leftovers as soon as possible.
Never drink from streams, springs, or lakes unless local health authorities have
checked that the water is safe for drinking.
Avoid washing pet cages or bowls in the same sink that you use to prepare food.
And try to keep pet feeding areas separate from family eating areas.
When Should I Call My Doctor?
Tell an adult if you have diarrhea, fever, vomiting, or severe belly pain. That
person can help you decide whether to call your doctor.
If you feel listless and your mouth and skin feel dry, or if your bowel movements
contain blood or mucus, you should contact or see a doctor right away. Also go to
the doctor if you are vomiting so much that you can't keep down fluids or if your
symptoms last more than 3 days.
What Can I Do to Feel Better?
You'll feel better if you stay well hydrated, so drink lots of water. Electrolytes
(sodium and potassium) are also lost and need to be replaced because the body cannot
function properly without them. Try sipping broth or soup, which contain sodium, and
diluted fruit juice (with no added sugar), which contains potassium.
When you feel ready to eat something more substantial, try soft fruits or vegetables,
which also contain potassium. Avoid milk products and fatty, high-fiber, or very sweet
foods until the diarrhea eases. And don't drink sports drinks or soft drinks —
they contain electrolytes, but their high sugar content can make diarrhea worse.
As uncomfortable as diarrhea may be, it is usually short-lived. Drink enough fluids
and follow your doctor's instructions, and you feel better in no time.