diarrhea when to seek care

Overview

Diarrhea is when you pass loose, watery stools more often than normal. It happens when your digestive system moves food and fluids through your body too quickly, so your body does not absorb enough water. Most cases are short-lived and get better on their own, but sometimes diarrhea can lead to dehydration or signal a more serious problem.

Yes, diarrhea is very common. Most people have it several times a year. It is one of the most frequent reasons people visit a doctor or pharmacist.

Diarrhea can affect anyone of any age. It is more likely to be serious in babies, young children, older adults, pregnant people, and people with weak immune systems.

Symptoms

Common symptoms

• Loose, watery stools three or more times a day
• Stomach cramps or pain
• Feeling bloated or nauseous
• An urgent need to use the bathroom
• Feeling tired or weak

Symptoms in children

• More fussy or irritable than usual
• Crying with fewer tears
• Dry mouth or tongue
• Fewer wet nappies than normal
• Sunken eyes or soft spot on the head
• A fever

Symptoms in older adults

• Feeling dizzy or lightheaded
• Dry mouth or sticky saliva
• Little or no urination
• Dark yellow urine
• Confusion or being unusually sleepy
• Weakness or trouble standing

Causes

Main causes

• Viruses, such as norovirus or rotavirus
• Bacteria from contaminated food or water
• Parasites, which are tiny living things that can enter the body through food or water
• Food intolerance, like trouble digesting lactose
• Medicines, especially antibiotics
• Digestive conditions, such as irritable bowel syndrome (IBS) or inflammatory bowel disease (IBD)

Risk factors

• Traveling to areas with poor water or food safety
• Eating undercooked or improperly stored food
• Drinking untreated water
• Being in close contact with someone who has diarrhea
• Having a weakened immune system
• Taking antibiotics or other medicines that affect digestion

When to see a doctor

See a doctor urgently if:

• Diarrhea that lasts more than 3 days for adults, or more than 24 hours in a child under 1
• Signs of dehydration (dry mouth, dark urine, dizziness, less urination)
• Severe stomach pain that does not ease
• Blood in your stool or black stools
• Diarrhea with a high fever (over 38°C or 100.4°F in adults; over 38°C in children under 3 months)
• Diarrhea that starts after returning from a country with poor sanitation

Book a routine appointment if:

• Diarrhea that keeps coming back or lasts more than 2 weeks
• Diarrhea that wakes you up from sleep at night
• Unexplained weight loss alongside diarrhea
• Ongoing bloating, gas, or cramping that affects daily life
• Diarrhea that happens after starting a new medicine

Diagnosis

A doctor will ask about your symptoms, how long they have lasted, and any recent travel, food, or medicines. They will likely do a physical exam and check for signs of dehydration. In many cases, this is enough to know what is going on.

Tests that may be done

• Stool sample test, to look for bacteria, parasites, or other signs of infection
• Blood test, to check for dehydration, infection, or digestive problems
• Breath test, if a food intolerance such as lactose intolerance is suspected
• A look inside the bowel (colonoscopy) – this is only needed if diarrhea is long-term and the cause is not clear

What to expect at your appointment

Your doctor may ask you to describe the frequency, color, and consistency of your stools. This is normal. They may check your pulse and blood pressure, and press on your belly to see if it is tender. You do not need to do anything special to prepare, but it may help to bring a list of all medicines, supplements, and recent foods you have had.

Treatment

For most short-term diarrhea, the main treatment is to replace lost fluids and rest. Your body usually clears the infection on its own. If an underlying problem like a food intolerance or a digestive condition is causing the diarrhea, treating that condition will help. Medicines exist to help with symptoms, but they are not always advised, and you should ask a healthcare professional before using them.

Self-care at home

• Drink plenty of fluids, such as water, clear soups, or oral rehydration solutions (they have the right balance of salt and sugar)
• Take small sips often, rather than big gulps at once
• Rest as much as possible
• Eat bland, easy-to-digest foods like plain rice, toast, bananas, or crackers
• Avoid dairy, greasy foods, or heavy spices until you feel better
• Wash your hands well with soap and water after using the bathroom

Medical treatments

If you are dehydrated, a healthcare professional may recommend an oral rehydration solution or, in severe cases, fluids through a drip. For bacterial infections, antibiotics may be prescribed. Some anti-diarrheal medicines can slow the gut down, but they are not safe for everyone, especially if there is blood in the stool or a high fever. Never give these medicines to a child without a doctor’s advice.

When is surgery considered?

Surgery is almost never needed for diarrhea. In rare cases, if diarrhea is caused by a serious digestive condition like inflammatory bowel disease with complications, surgery may be considered, but only after other treatments have been tried.

Living with this condition

Most people recover from a short bout of diarrhea within a week. While you are sick, it helps to stay near a bathroom, keep fluids close by, and rest. If you have a long-term condition that causes diarrhea, you may need to plan ahead when going out, and keep a small emergency kit with you.

Lifestyle tips

• Drink enough fluids every day to stay hydrated
• Eat regular, balanced meals with fruits and vegetables
• Manage stress with relaxation techniques or hobbies
• Get enough sleep to support your immune system
• Exercise regularly, but start gently if you have been unwell

Diet and exercise

For short-term diarrhea, a quiet diet of bland foods helps. As you recover, slowly add back nutritious foods. For long-term diarrhea, some people benefit from keeping a food diary to spot triggers. Gentle exercise like walking can help you feel better, but avoid intense workouts until you are hydrated and strong again.

Mental health and emotional wellbeing

Living with frequent diarrhea can be stressful and embarrassing. It can affect your work, social life, and self-esteem. It is normal to feel frustrated or anxious. Talk to your doctor if the emotional side is heavy. You are not alone, and getting the right treatment can greatly improve your quality of life.

Prevention

Many cases of diarrhea can be prevented by good hygiene and safe food handling. Wash your hands with soap and water after using the toilet, before eating, and before preparing food. Drink clean, safe water and eat well-cooked food. If you travel, follow safe food and water guidelines. Good handwashing is the best single step.

Vaccines

There is a vaccine for rotavirus, which is a common cause of severe diarrhea in babies and young children. It is given as part of routine childhood immunization in many countries, including the UK. Ask your doctor or nurse if you have questions about this or any other travel-related vaccines.

Screening programmes

There is no routine screening for diarrhea in generally healthy people. If you have long-term diarrhea or other digestive symptoms, your doctor may recommend tests to look for an underlying condition like inflammatory bowel disease or coeliac disease.

Complications

If left untreated

• Dehydration, which can be serious or life-threatening if severe
• Electrolyte imbalance (loss of important minerals your body needs)
• Kidney problems from low fluids
• Malnutrition if diarrhea lasts a long time and the body cannot absorb nutrients
• Severe infection spreading beyond the gut in rare cases

Long-term outlook

The outlook for diarrhea is generally very good. Most cases are mild and clear up within a few days. Even when diarrhea is more serious, modern treatments can help you recover. With proper hydration, rest, and the right care, most people feel better within a week. If diarrhea is a sign of a long-term condition, know that there are ways to manage it so you can live a full and active life.

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