Parent guide

Blood in a Child's Stool

Blood in stool can result from a small anal fissure caused by hard stool, infection, food-protein reactions in infants, inflammation or other digestive conditions. Colour, amount, pain, stool consistency and the child's overall condition help determine urgency.

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Common signs

What parents may notice

  • Bright red streaks on hard stool
  • Blood mixed through loose stool
  • Dark or black stool
  • Pain during bowel movement
  • Abdominal pain or diarrhoea
  • Mucus in stool
  • Pallor, tiredness or weight loss
Possible reasons

What can cause it?

Constipation and anal fissures are common causes of bright red blood. Infection, polyps, inflammatory bowel disease, food-protein reactions and upper digestive bleeding are among other possibilities. Iron and some foods can darken stool without bleeding.

When to book

When should your child be assessed?

  • Bleeding recurs
  • Blood is mixed with diarrhoea
  • There is pain, fever or weight loss
  • The child is pale or tired
  • The cause is not clearly a small fissure
Urgent warning signs

When to seek immediate care

  • Large or ongoing bleeding
  • Black tar-like stool with weakness
  • Severe abdominal pain or swelling
  • Collapse, dizziness or marked pallor
  • A very unwell infant
At the specialist visit

How the concern may be evaluated

  • Stool and constipation history
  • Abdominal and anal examination where appropriate
  • Blood or stool tests when indicated
  • Growth and nutrition review
  • Endoscopy only when clinically necessary
Prepare

What to do before the visit

  • Photograph the stool if safe and useful
  • Note stool consistency and pain
  • Bring medicine and diet history
  • Bring prior blood or stool reports
Clinical owner
Relevant Lavender Lane paediatric speciality
Location
Sector 90, Noida
Last updated
August 2026
Questions parents ask

The real questions, answered.

Not what we wish you'd ask. What you're actually thinking when you find this page.

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Can constipation cause blood in stool?

Yes. Hard stool can cause a small fissure that leaves bright red blood on the surface or tissue.

What does black stool mean?

Black tar-like stool can indicate digested blood, although iron and certain foods can also darken stool. Seek medical advice.

Is blood with diarrhoea urgent?

It needs prompt assessment, especially with fever, pain, dehydration or a child who looks unwell.

Will my child need a colonoscopy?

Most children do not. Endoscopy is considered only when the history, examination or tests indicate it.

Should I bring a stool sample?

Ask the clinic first because the type and collection method depend on the suspected cause.

Persistent symptoms deserve a clear next step.

Speak with Paediatric Gastroenterology or contact our team to organise the right starting point.

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