Diarrhea is where you frequently pass watery or loose poo. Some people may also have other symptoms, depending on the cause.
It affects most people from time to time and is usually nothing to worry about. However, it can be distressing and unpleasant until it passes, which normally takes a few days to a week.
The excessive loss of water in your poo can also sometimes lead to symptoms of dehydration, which can be serious if it's not recognized and treated quickly.
Contact your doctor for advice if you're concerned about yourself or your child.
You should also contact your doctor in the situations outlined below, as they may mean an increased risk of a more serious problem.
You should contact your doctor urgently if your baby has had six or more episodes of diarrhea in the past 24 hours, or if they've vomited three times or more in the past 24 hours.
You should also seek advice if your baby has any symptoms of dehydration.
Contact your doctor if your child has:
You should also contact your doctor if your child has persistent diarrhea. Most cases will pass in five to seven days.
Contact your doctor if you have diarrhea and:
You should also contact your doctor if you have persistent diarrhea. Most cases in adults will pass in two to four days.
There are many different causes of diarrhea, but a bowel infection (gastroenteritis) is a common cause in both adults and children.
Gastroenteritis can be caused by:
These infections can sometimes be caught during travel abroad, particularly to areas with poor standards of public hygiene. This is known as traveler's diarrhea.
Diarrhea can also be the result of:
Most cases of diarrhea clear up after a few days without treatment, and you may not need to see your doctor.
However, diarrhea can lead to dehydration, so you should drink plenty of fluids until it passes.
It's very important that babies and small children don't become dehydrated. Your pharmacist may suggest you use an oral rehydration solution (ORS) if you or your child are particularly at risk of dehydration.
You should eat solid food as soon as you feel able to. If you're breastfeeding or bottle feeding your baby and they have diarrhea, you should try to feed them as normal.
Stay at home until at least 48 hours after the last episode of diarrhea to prevent spreading any infection to others.
Medications to reduce diarrhea, such as loperamide, are available. However, these aren't usually necessary, and most types shouldn't be given to children.
Diarrhea is often caused by an infection. You can reduce your risk by making sure you maintain high standards of hygiene.
For example, you should:
It's important to practise good food and water hygiene while travelling abroad, such as avoiding potentially unsafe tap water and undercooked food.
If you're planning a trip abroad, check health advice for the countries you'll be travelling to.
Read more about:
Rotavirus is a virus that commonly causes diarrhea in children. A vaccine that helps protect children against rotavirus is now part of the routine childhood vaccination schedule.
This vaccine is given as a liquid that's dropped into a baby's mouth. It's given in two doses, with the first given at two months and another at three months.
Diarrhea usually occurs when fluid can't be absorbed from the contents of your bowel, or when extra fluid is secreted into your bowel, causing watery poo.
Diarrhea is usually a symptom of a bowel infection (gastroenteritis), which can be caused by:
Other possible causes of short-term diarrhea include:
Diarrhea can also sometimes be a side effect of a medication, including:
The patient information leaflet that comes with your medicine should state whether diarrhea is a possible side effect.
Conditions that can cause persistent diarrhea include:
Persistent diarrhea can also sometimes occur after surgery on the stomach, such as a gastrectomy.
Most cases of diarrhea get better within a week, and you may not need to visit your doctor.
The information below explains what will happen if you need to see your doctor.
To identify what's causing your diarrhea, your doctor may ask you questions about:
Your doctor may ask you for a stool sample so it can be analyzed for signs of an infection if you have:
Your doctor may suggest you have some blood tests if they suspect your diarrhea is being caused by an underlying health condition.
For example, your blood can be tested for signs of inflammation, which may suggest inflammatory bowel disease.
Your doctor may recommend a digital rectal examination (DRE) if you have unexplained persistent diarrhea, particularly if you're over 50.
During a DRE, your doctor will insert a gloved finger into your bottom to feel for any abnormalities. It can be useful for diagnosing conditions that affect your rectum and bowel.
If you have persistent diarrhea and your doctor is unable to find the cause, they may refer you to your local hospital for further investigation.
You may have:
Diarrhea usually clears up without treatment after a few days, particularly if it's caused by an infection.
In children, diarrhea usually passes within five to seven days and rarely lasts longer than two weeks.
In adults, diarrhea usually improves within two to four days, although some infections can last a week or more.
While waiting for your diarrhea to pass, you can ease your symptoms by following the advice outlined below.
It's important to drink plenty of fluids to avoid dehydration , particularly if you're also vomiting. Take frequent small sips of water.
Ideally, adults should drink a lot of liquids that contain water, salt and sugar. Examples are soup broth or water mixed with juice.
If you're drinking enough fluid, your urine will be light yellow or almost clear.
It's also very important for babies and small children not to become dehydrated. Give your child frequent sips of water, even if they're vomiting. A small amount is better than nothing.
Fruit juice or fizzy drinks should be avoided as they can make diarrhea worse in children.
If you're breastfeeding or bottle-feeding your baby and they have diarrhea, you should continue to feed them as normal.
Contact your doctor immediately if you or your child develop any symptoms of dehydration.
Your doctor or pharmacist may suggest using an oral rehydration solution (ORS) to prevent dehydration if you're at risk – for example, if you're frail or elderly. ORS can also be used to treat dehydration that has already occurred.
Rehydration solutions usually come in sachets. They are dissolved in water, and replace salt, glucose and other important minerals that are lost if you're dehydrated.
Your doctor or pharmacist may recommend giving your child an ORS if they're dehydrated or at risk of becoming dehydrated.
The usual recommendation is for your child to drink an ORS each time they have an episode of diarrhea. The amount they should drink will depend on their size and weight.
Your pharmacist can advise you about this. The manufacturer's instructions should also give information about the recommended dose.
You may be able to give your baby an ORS if they become dehydrated, but check with a doctor or pharmacist first.
Opinion is divided over when and what you should eat if you have diarrhea. However, most experts agree you should eat solid food as soon as you feel able to. Eat small, light meals and avoid fatty or spicy foods.
Good examples are potatoes, rice, bananas, soup and boiled vegetables. Salty foods help the most.
You don't need to eat if you've lost your appetite, but you should continue to drink fluids and eat as soon as you feel able to.
If your child is dehydrated, don't give them any solid food until they have drunk enough fluids. Once they stop showing signs of dehydration, they can start eating their normal diet.
If your child isn't dehydrated, offer them their normal diet. If they refuse to eat, continue to give them fluids and wait until their appetite returns.
Antidiarrheal medicines may help reduce your diarrhea and slightly shorten how long it lasts. However, they're not usually necessary.
Loperamide is the main antidiarrheal medicine used, as it has been shown to be effective and causes few side effects.
Loperamide slows down the muscle movements in your gut so more water is absorbed from your stools. This makes your stools firmer and they're passed less frequently.
An alternative to loperamide is a different type of antidiarrheal medicine called racecadotril, which works by reducing the amount of water produced by the small intestine.
Evidence suggests this medication may be as effective as loperamide for treating diarrhea.
Some antidiarrheal medicines can be bought from a pharmacy.
Check the patient information leaflet that comes with the medicine to find out whether it's suitable for you and what dose you should take. Ask your pharmacist for advice if you're unsure.
Don't take antidiarrheal medicines if there's blood or mucus in your stools or you have a high temperature (fever). Instead, you should contact a doctor for advice.
Most antidiarrheal medicines shouldn't be given to children. Racecadotril can be used in children over three months old if it's combined with oral rehydration and the other measures mentioned above, although not all doctors recommend it.
Painkillers won't treat diarrhea, but ibuprofen can help relieve a fever and a headache. If necessary, you can give your child liquid ibuprofen.
Always read the patient information leaflet that comes with the medication to check if it's suitable and find out the correct dose. Children under 16 years of age shouldn't be given aspirin.
Treatment with antibiotics isn't recommended for diarrhea if the cause is unknown. This is because antibiotics:
Antibiotics may be recommended if you have severe diarrhea and a specific type of bacteria has been identified as the cause.
They may also be used if you have an underlying health problem, such as a weakened immune system.
Occasionally, hospital treatment may be needed to treat serious dehydration. Treatment involves administering fluids and nutrients directly into a vein (intravenously).
If you've been diagnosed with a specific condition that's causing your diarrhea, treating this may help improve your symptoms.
Probiotics are live bacteria and yeasts found in some yoghurts and food supplements.
There's some evidence that certain probiotics can slightly shorten a period of diarrhea, although the evidence isn't yet strong enough to recommend taking them.
There's also evidence to suggest some probiotics may reduce your chances of developing diarrhea after taking antibiotics.
Important: Our website provides useful information but is not a substitute for medical advice. You should always seek the advice of your doctor when making decisions about your health.