Diarrhoea persistent causes in teenagers

Overview

Persistent diarrhoea is when loose, watery bowel movements last for more than two weeks. It can be a sign of a long-term digestive issue or an infection that hasn't cleared up.

Yes, persistent diarrhoea is fairly common in teenagers, though it often gets better on its own or with simple changes.

Teenagers of any gender can get it. It's more likely if they have a family history of digestive disorders, travel to areas with poor sanitation, or experience high stress.

Symptoms

Common symptoms

• Frequent, watery or loose stools
• Urgency to use the toilet
• Abdominal cramps or bloating
• Feeling tired or weak

Symptoms in children

• In younger children (including teenagers) symptoms may also include weight loss, poor appetite, and irritability.

Symptoms in older adults

• In older adults, persistent diarrhoea can lead to more severe dehydration and electrolyte imbalances, so they should seek medical help quickly.

Causes

Main causes

• Infections: bacteria, viruses, or parasites – often from contaminated food or water
• Food intolerances: trouble digesting lactose, gluten, or certain sugars
• Irritable bowel syndrome (IBS): a common condition affecting bowel habits
• Inflammatory bowel disease (IBD): like Crohn's disease or ulcerative colitis
• Medications: antibiotics or other drugs can upset the gut
• Stress or anxiety: can affect digestion

Risk factors

• Poor handwashing or hygiene
• Travel to countries with less clean water
• Family history of IBS or IBD
• High-stress lifestyle or anxiety
• Recent use of antibiotics

When to see a doctor

See a doctor urgently if:

• If you have bloody stools or severe pain, see a doctor or go to urgent care right away.
• If you can't keep fluids down or feel very dehydrated, seek medical help urgently.

Book a routine appointment if:

• Make a routine appointment if diarrhoea lasts more than 2 to 3 weeks.
• See your GP if you have unintended weight loss, fevers that come and go, or pain at night.

Diagnosis

Your doctor will ask about your symptoms, diet, travel history, and any medications. They may also do a physical exam.

Tests that may be done

• Stool sample: to check for infections or blood
• Blood tests: to look for signs of inflammation, anaemia, or celiac disease
• Breath test: for lactose intolerance or bacterial overgrowth
• Endoscopy or colonoscopy: a tube with a camera to see inside the bowel, if needed

What to expect at your appointment

If initial tests don't show a cause, you may be referred to a gastroenterologist (a stomach and bowel specialist). They will work with you to find the right treatment.

Treatment

Treatment depends on the cause. Most cases get better with simple changes, but some require medicines or management of a long-term condition.

Self-care at home

• Drink plenty of clear fluids like water or diluted fruit juice to prevent dehydration
• Use oral rehydration salts (available at pharmacies) if you're losing a lot of fluid
• Eat small, bland meals – like rice, bananas, toast, or plain chicken
• Avoid dairy, caffeine, fatty foods, and sugary drinks for a while
• Rest and manage stress

Medical treatments

A doctor may recommend over-the-counter or prescription treatments that slow down bowel movements or stop an infection. For conditions like IBS or IBD, long-term management plans are used – your doctor will explain the options.

When is surgery considered?

Surgery is rarely needed for persistent diarrhoea in teenagers, but it may be considered for severe inflammatory bowel disease or complications like an intestinal blockage. Your specialist will discuss this if it applies.

Living with this condition

Living with persistent diarrhoea can be challenging, but many people manage well with the right routine. Plan bathroom breaks, carry wipes and a change of clothes, and talk to your doctor about what helps.

Lifestyle tips

• Keep a food and symptom diary to spot triggers
• Get enough sleep and try relaxation techniques like deep breathing
• Stay active – gentle exercise can help digestion and reduce stress

Diet and exercise

Eat smaller, more frequent meals. Avoid foods that trigger your symptoms. Exercise lightly – even a walk helps. If you have a specific intolerance, a dietitian can help plan meals.

Mental health and emotional wellbeing

Ongoing diarrhoea can make you feel embarrassed, anxious, or frustrated. It's normal to feel this way. Talk to a trusted adult or a counsellor – you don't have to deal with it alone.

Prevention

Some causes can't be prevented, but you can lower your risk. Wash your hands often, especially before eating and after using the toilet. Drink clean water and eat well-cooked food, especially when travelling.

Vaccines

Vaccinations for rotavirus are given in infancy and protect against one cause of diarrhoea. For teenagers, no routine vaccine is recommended for persistent diarrhoea.

Screening programmes

There is no routine screening for persistent diarrhoea in teenagers. Your doctor may suggest tests if you have symptoms or risk factors.

Complications

If left untreated

• Dehydration – can cause dizziness, confusion, and low blood pressure
• Malnutrition – not absorbing enough nutrients, leading to weight loss and tiredness
• Electrolyte imbalances – can affect heart and muscle function
• Damage to the bowel lining (with long-term conditions like IBD)

Long-term outlook

With the right care, most teenagers recover fully or manage their condition well. Even chronic conditions like IBD can be treated so you can live a full, active life. Your healthcare team will guide you.

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