Blood in stool in children

Overview

Blood in stool means you see red or dark blood in your child's poo or on the toilet paper. It can come from a small tear in the bottom (anal fissure), constipation, an infection, or other conditions. Most causes are not serious, but it's important to check with a doctor.

Yes, blood in stool is fairly common in children, especially during constipation or after a stomach bug. Most cases are mild and get better on their own, but it's always wise to have it checked.

It can affect children of any age, from babies to teenagers. It is more common in toddlers who have constipation or during potty training, and in infants with cow's milk protein allergy.

Symptoms

Common symptoms

• Bright red blood on the surface of the poo or on toilet paper
• Streaks or drops of blood in the toilet bowl
• Dark, black, or tarry poo (which can mean bleeding from higher up in the gut)
• Constipation or hard, painful poo
• Stomach aches or cramps

Symptoms in children

• Crying or straining when passing stool
• Itchy or sore bottom (from a fissure or infection)
• Not wanting to eat or drink
• Fever (if caused by infection)
• Mucus in the stool along with blood (can be from an allergy or infection)

Symptoms in older adults

• This article focuses on children; in older adults causes and seriousness may differ. Please see the adult blood in stool section.

Causes

Main causes

• Anal fissure – a small tear in the skin around the anus, often from passing hard or large stools
• Constipation – hard stools can cause small tears or irritate the lining
• Infections – like bacterial or viral gastroenteritis (stomach bug) that inflames the bowel
• Allergies – especially cow's milk protein allergy in infants, causing inflammation
• Bowel inflammation – such as from inflammatory bowel disease (Crohn's disease or ulcerative colitis)
• Polyps – small, non-cancerous growths in the bowel that can bleed
• Intussusception – a part of the bowel folds into itself (more common in infants, requires urgent care)
• Meckel's diverticulum – a small pouch in the bowel that can cause bleeding (rare)

Risk factors

• Chronic constipation or difficulty passing stool
• Family history of inflammatory bowel disease or polyps
• Infant diet – especially cow's milk formula without allergy management
• Stomach infections or recent diarrheal illness
• Age – certain causes like intussusception are more common in babies under 2

When to see a doctor

See a doctor urgently if:

• If your child has a large amount of blood in stool, dark or black stools, or signs of shock (pale, weak, fast breathing)
• If your child has severe belly pain or a swollen, hard belly
• If your child is vomiting blood or looks very unwell

Book a routine appointment if:

• If you see a small streak of blood once or twice and your child seems well
• If your child has ongoing mild bleeding, even without pain
• If your child has blood in stool along with constipation or diarrhoea that lasts more than a few days

Diagnosis

Your doctor will ask about your child's symptoms, pooing habits, and diet. They will do a gentle physical examination, which may include looking at the bottom for tears or swelling. Usually no special tests are needed, but if bleeding is ongoing or heavy, the doctor may recommend some tests.

Tests that may be done

• Stool sample – to check for infections or blood that is not visible
• Blood tests – to look for anaemia (low iron) or signs of inflammation
• Ultrasound – if a blockage or intussusception is suspected
• Endoscopy or colonoscopy – a thin tube with a camera to look inside the bowel (rarely needed in children unless other tests are unclear)

What to expect at your appointment

Most diagnoses are made without invasive procedures. Your doctor will explain what they find and why. If a serious cause is found, your child will be referred to a paediatric gastroenterologist (a specialist). Many children need only simple lifestyle changes or treatment for constipation.

Treatment

Treatment depends on the cause. For common causes like anal fissure or constipation, the focus is on softening stools and healing the tear. For infections, it's often supportive care. For allergies or inflammatory conditions, specific medical management is needed. Your doctor will create a plan tailored to your child.

Self-care at home

• Give your child plenty of water and fibre-rich foods (fruits, vegetables, whole grains) to keep stools soft.
• Warm baths can help relax the bottom and soothe a fissure.
• Avoid straining during pooing – encourage your child to sit comfortably and not rush.
• For constipation, you can try gentle tummy massage or bicycle legs for babies (ask your health visitor).

Medical treatments

If constipation is severe, a doctor may recommend a short course of stool-softening medicine (laxatives) for children. For infections, oral rehydration solutions may be advised. If an allergy is suspected, your doctor might suggest eliminating certain foods (like cow's milk) from the diet. For inflammatory bowel disease, medicines that reduce inflammation in the bowel are used – your specialist will discuss options. All treatments should be supervised by a healthcare professional.

When is surgery considered?

Surgery is rarely needed for blood in stool in children. It may be required if a large polyp (growth) needs removal, or to correct intussusception (when the bowel folds inside itself). Your doctor will explain if surgery is needed.

Living with this condition

If your child has a chronic condition like inflammatory bowel disease, they may need regular check-ups and medicines. Keep a diary of symptoms and poo patterns to share with the doctor. Most children with short-term causes return to normal quickly.

Lifestyle tips

• Encourage regular, gentle physical activity to help bowel movement.
• Establish a calm toilet routine – don't force your child to sit too long.
• Teach your child to wipe gently and not too hard after pooing.

Diet and exercise

A balanced diet with enough fibre (e.g., oats, apples, carrots) and fluids helps keep stools soft. Avoid too many processed snacks. Exercise like running and playing helps digestion.

Mental health and emotional wellbeing

Seeing blood can be scary for both you and your child. They may feel anxious about pooing if it hurts. Reassure them, and talk to your doctor if your child seems stressed or avoids the toilet. For chronic conditions, seeking support from a child psychologist can help.

Prevention

You can prevent many cases of blood in stool by preventing constipation. Make sure your child drinks enough water, eats fibre-rich foods, and stays active. For infants, if cow's milk allergy is diagnosed, following an elimination diet under medical supervision can prevent flare-ups.

Vaccines

There are no vaccines that directly prevent blood in stool. However, rotavirus vaccine (given to babies) can prevent severe diarrhoea from this virus, which sometimes causes bloody stools.

Screening programmes

There is no routine screening for blood in stool in children. If there is a family history of bowel cancer or polyps, your doctor may discuss future screening options when your child is older.

Complications

If left untreated

• Anaemia (low red blood cells) if bleeding continues for a long time
• Dehydration from diarrhoea or refusal to drink
• Severe infection spreading from the bowel
• In intussusception, bowel damage if not treated quickly

Long-term outlook

The outlook for most children with blood in stool is very good. The cause is usually simple and resolves with time or minor treatment. Even for more serious conditions like inflammatory bowel disease, modern treatments help children lead active, normal lives. Early medical review is the best way to ensure a positive outcome.

Find support

External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.