Blood in Stool and Rectal Bleeding in Children: When to Seek Care

An independent educational resource prepared by Mark M. Simonian, MD, FAAP

Sources checked: August 9, 2026     |     Medical review completed: August 9, 2026

This page is for general education only and does not replace individualized medical advice. This resource does not establish a doctor-patient relationship. For questions about your own child, contact your child's current healthcare professional.

Magnolia Pediatrics, Valley Children's Healthcare

2497 E. Herndon Avenue, Suite 101, Clovis, CA 93611     |     559-538-3070

A small bright-red streak on the outside of a hard stool is often from a tiny anal fissure caused by constipation. Blood mixed with diarrhea, black or tarry stool, larger bleeding, pain, fever, or an ill-appearing child needs prompt medical evaluation.

Urgent Warning Signs - Check This First

Blood in stool can look dramatic because a small amount spreads in toilet water. Still, do not assume it is harmless if the child has concerning symptoms or the bleeding is more than a small streak.

CALL 911 NOW

  • Fainting, collapse, confusion, severe weakness, or a child who is too weak to stand

  • Signs of shock: very pale or gray skin, cold clammy skin, rapid breathing, severe sleepiness, or unresponsiveness

  • A life-threatening emergency or a child who looks severely ill

GET EMERGENCY MEDICAL CARE NOW

  • A large amount of blood in stool, blood passed without stool, repeated significant bleeding, or vomiting blood or material that looks like coffee grounds

  • Black, tarry, sticky stool that is not explained by iron, bismuth-containing medicine, or a clearly known food or substance

  • Blood in stool with severe or constant abdominal pain, a swollen abdomen, repeated vomiting, or green vomit

  • Blood in stool with high fever, severe dehydration, or a child who is becoming worse or looks very ill

CONTACT YOUR CHILD'S HEALTHCARE PROFESSIONAL TODAY

  • Any blood with diarrhea, mucus, fever, abdominal cramps, rectal pain, or signs of dehydration

  • A baby younger than 12 weeks with blood in the stool, or a newborn with any concerning feeding, vomiting, or illness symptom

  • A small amount of bright-red blood that is not clearly a one-time streak from a hard stool, repeats, or persists

  • Blood in stool after travel, a possible foodborne exposure, recent antibiotic use, an anal or rectal injury, or in a child with an immune condition, inflammatory bowel disease, or bleeding disorder

  • Uncertainty about whether the color is blood, especially if red or dark stool continues after stopping suspected foods or medicines

What Families May See

  • Bright red streaks on the surface of a hard stool or on toilet paper can come from a small anal fissure. Constipation is a common cause.

  • Blood mixed into loose or watery stool may occur with an intestinal infection or another intestinal condition and should be evaluated promptly.

  • Black, tarry stool can suggest bleeding higher in the digestive tract, but dark green stool, iron, bismuth medicines, and some foods can also look dark.

  • Red or purple foods, drinks, candy, frosting, beets, tomatoes, some medicines, and swallowed blood from a nosebleed or a cracked breastfeeding nipple can change stool color without bleeding from the intestine.

What to Do at Home While Arranging Care

  • Observe the child's overall condition: alertness, belly pain, vomiting, fever, drinking, and urination.

  • If practical, take a clear photo of the stool in good light and note foods, medicines, illness symptoms, and the time it occurred. A clinician may also ask for a sample.

  • Do not give antidiarrheal medicine, laxatives, enemas, suppositories, or rectal treatments unless a clinician has advised them for this child and situation.

  • Offer usual fluids if the child can drink comfortably. Seek care promptly if there are signs of dehydration, such as markedly reduced urine, a very dry mouth, no tears, or unusual sleepiness.

  • If the child has a history of constipation and only a small bright-red streak with a hard stool, use the previously reviewed constipation plan and contact the child's healthcare professional for guidance.

Why an Examination May Be Needed

A clinician may ask about stool pattern, diet, medicines, recent illness, travel, exposures, and family history. Examination may identify a fissure or another source of bleeding. When needed, testing helps determine whether there is infection, inflammation, anemia, or another condition. This page cannot determine the cause from stool color alone.

Call Preparation

  • Color and amount of blood, whether it was on the stool, mixed in stool, on tissue, or passed alone, and whether the stool was hard, loose, black, or tarry

  • Belly pain, fever, vomiting, diarrhea, constipation, rectal pain, recent injury, and signs of dehydration

  • Recent foods, medicines, antibiotics, supplements, travel, sick contacts, or suspected food exposure

  • A photograph or sample if requested, and any history of bowel disease, bleeding disorder, or immune condition

Related Guides

  • Constipation and Stool Problems: When to Seek Care

  • Abdominal Pain: When to Seek Care

  • Vomiting, Diarrhea and Dehydration: When to Seek Care

  • Fever and Illness: When to Seek Care

Sources and Medical Review

  • HealthyChildren.org (AAP), Red Stools in Children: Common Causes https://www.healthychildren.org/English/health-issues/conditions/abdominal/Pages/red-stools-in-children-common-causes.aspx

  • HealthyChildren.org (AAP), Stools - Blood In Symptom Checker https://www.healthychildren.org/English/tips-tools/symptom-checker/Pages/symptomviewer.aspx?symptom=Stools%2B-%2BBlood%2BIn

  • National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), Symptoms and Causes of GI Bleeding https://www.niddk.nih.gov/health-information/digestive-diseases/gastrointestinal-bleeding/symptoms-causes

  • HealthyChildren.org (AAP), Shigella Infections https://www.healthychildren.org/English/health-issues/conditions/abdominal/Pages/Shigella-Infections.aspx