What is diarrhea?
Diarrhea is when your stools are loose and watery. You may also need to go to the
bathroom more often.
Diarrhea is a common problem. It may last 1 or 2 days and goes away on its own.
If diarrhea lasts more than 2 days it may mean you have a more serious problem.
Diarrhea may be either:
- Short-term (acute). Diarrhea that lasts 1 or 2 days and goes away. This may be caused by having food or
water that was made unsafe by a bacterial infection. Or it may happen if you get sick
from a virus.
- Long-term (chronic). Diarrhea that lasts several weeks. This may be caused by another health problem such
as irritable bowel syndrome. It can also be caused by an intestinal disease such as
Crohn’s disease or celiac disease. Some infections such as parasites can cause chronic
What causes diarrhea?
Diarrhea may be caused by many things, including:
- A bacterial infection
- A virus
- Trouble digesting certain things (food intolerance)
- Food allergy (such as celiac disease, gluten allergy)
- Parasites that enter the body through food or water
- A reaction to medicines
- An intestinal disease, such as inflammatory bowel disease
- A problem with how your stomach and bowels work (functional bowel disorder), such
as irritable bowel syndrome
- A result of surgery on the stomach or gall bladder
- Recent antibiotic use
- Metabolic conditions such as thyroid problems
- Other less common reasons such as damage from radiation treatments or tumors that
make too many hormones
Many people get traveler's diarrhea. This happens when you have food or water that
is not safe because of bacteria, parasites, and even food poisoning.
Severe diarrhea may mean you have a serious disease. See your healthcare provider
if your symptoms don’t go away or if they keep you from doing your daily activities.
It may be hard to find out what is causing your diarrhea.
What are the symptoms of diarrhea?
Each person’s symptoms may vary. Symptoms of diarrhea may include:
- Belly (abdominal) cramps
- Stomach pain
- Swelling (bloating)
- Upset stomach (nausea)
- Urgent need to go to the bathroom
- Bloody stools
- Loss of body fluids (dehydration)
- Leaking stool and not being able to control your bowels (incontinence)
Dehydration is a serious side effect of diarrhea. Symptoms include:
- Feeling thirsty
- Not urinating as often
- Having dry skin as well as a dry mouth and nostrils (mucous membranes)
- Feeling very tired
- Feeling that you may pass out or faint (lightheaded)
- Fast heart rate
- Sunken fontanelle (soft spot) on baby's head
Diarrhea symptoms may look like other health problems. Bloody diarrhea is always
a concern. Always see your doctor to be sure. Be sure to tell the doctor about any
bleeding, fever, or vomiting.
How is diarrhea diagnosed?
To see if you have diarrhea, your healthcare provider will give you a physical exam
and ask about your past health. You may also have lab tests to check your blood and
Other tests may include:
- Stool studies including culture and other tests. This test checks for any abnormal bacteria in your digestive tract that may cause
diarrhea and other problems. To do this, a small stool sample is taken and sent to
- Sigmoidoscopy. This test lets your healthcare provider check the inside of part of your large intestine.
It helps to tell what is causing diarrhea. A short, flexible, lighted tube (sigmoidoscope)
is put into your intestine through the rectum. This tube blows air into your intestine
to make it swell. This makes it easier to see inside. A biopsy can be taken if needed.
- Colonoscopy. This test looks at the full length of your large intestine. It can help check for
any abnormal growths, tissue that is red or swollen, sores (ulcers), or bleeding.
A long, flexible, lighted tube (colonoscope) is put into your rectum up into the colon.
This tube lets your healthcare provider see the lining of your colon and take out
a tissue sample (biopsy) to test it. He or she can also treat some problems that may
- Imaging tests. These tests can see if there are any problems with the way your organs are formed
- Fasting tests. These tests show if you are unable to digest certain foods (food intolerance). They
can also tell if certain foods bring on an immune system reaction (food allergy).
- Blood tests. These can look for metabolic problems like thyroid disease, anemia (low blood count),
evidence of low vitamin levels suggesting poor absorption, and celiac disease, among
How is diarrhea treated?
Your healthcare provider will make a care plan for you based on:
- Your age, overall health, and past health
- How serious your case is
- How well you handle certain medicines, treatments, or therapies
- If your condition is expected to get worse
- What you would like to do
In most cases you will need to replace the fluids you have lost.
You may also need a medicine that fights infection (antibiotic) if a bacterial infection
is causing your diarrhea.
Complications of diarrhea
If your diarrhea is not treated you are at risk for dehydration. Severe dehydration
can lead to organ damage, shock, and fainting (loss of consciousness) or coma.
Can diarrhea be prevented?
Having good personal habits can keep you from getting diarrhea caused by bacteria
or a virus. It is important to:
- Wash your hands often
- Use alcohol based sanitizers
- Eat foods that have been cleaned and cooked in a safe way
- Not take any foods or liquids that may have been infected with a bacteria or virus
When you are traveling, make sure anything you eat and drink is safe. This is even
more important if you travel to developing countries.
Travel safety tips for water and other liquids include:
- Not drinking tap water or using it to brush your teeth
- Not using ice made from tap water
- Not drinking milk or milk items that have not gone through a process to kill certain
Travel safety tips for food include:
- Not eating any fresh or raw fruits and vegetables unless you wash and peel them yourself
- Making sure all meat and fish have been cooked to at least medium doneness
- Not eating raw or rare-cooked meat or fish
- Making sure meat and shellfish such as shrimp, crab, and scallops, are hot when served
- Not eating food from street vendors or food trucks
Living with diarrhea
In most cases diarrhea is a short-term problem. Often it only lasts for a few days.
Be sure to take plenty of liquids when you’re having a bout of diarrhea.
Some health problems can make diarrhea last longer or keep coming back. These include
inflammatory bowel disease and irritable bowel syndrome. If another health problem
is causing your diarrhea, follow your healthcare provider’s advice for treating that
When should I call my healthcare provider?
Call your healthcare provider if:
- You have diarrhea more often
- You have a greater amount of diarrhea
- You have symptoms of dehydration. You may feel thirsty, tired, or dizzy. You may also
have less urine, or a dry mouth.
- You have diarrhea with rectal bleeding or black and tarry stools, a fever, or are
Key points about diarrhea
- Diarrhea is when your stools are loose and watery.
- You may also need to go to the bathroom more often.
- Short-term (acute) diarrhea lasts 1 or 2 days.
- Long-term (chronic) diarrhea lasts several weeks.
- Diarrhea symptoms may include belly cramps and an urgent need to go to the bathroom.
- Loss of fluids (dehydration) is one of the more serious side effects.
- Treatment usually involves replacing lost fluids.
- You may need an infection-fighting medicine (antibiotic) if a bacterial infection
is the cause.
Tips to help you get the most from a visit to your health care provider:
- Before your visit, write down questions you want answered.
- Bring someone with you to help you ask questions and remember what your provider tells
- At the visit, write down the names of new medicines, treatments, or tests, and any
new instructions your provider gives you.
- If you have a follow-up appointment, write down the date, time, and purpose for that
- Know how you can contact your provider if you have questions.