Blood In Stool (Hemochezia): Causes & Treatment

Seeing blood in the toilet, on toilet paper or mixed with stool can be worrying. Bright red rectal bleeding may come from hemorrhoids or an anal fissure, but it can also signal inflammation, intestinal bleeding or colorectal disease. The appearance of blood can provide clues, but it cannot confirm the cause without appropriate assessment.

Written and Reviewed by Dr. Md Noman Islam Nirob, MBBS

Patient education guide • Evidence-informed medical information

Quick Summary

Hemochezia: The passage of visible blood through the rectum, often bright red or maroon.
Common causes: Hemorrhoids, anal fissures, diverticular bleeding, colitis and other intestinal conditions.
Important: Do not assume that every episode of rectal bleeding is caused by piles.
Diagnosis: May involve a clinical examination, blood tests, stool tests, anoscopy or colonoscopy, depending on the symptoms.
Emergency warning signs: Heavy or ongoing bleeding, large clots, faintness, severe abdominal pain or signs of circulatory instability.
Treatment: Depends on the source and severity of bleeding.

When is blood in stool an emergency?

Seek emergency medical care if bleeding is heavy or will not stop, the toilet water turns red, you pass large blood clots, or bleeding occurs with faintness, marked dizziness, weakness or severe abdominal pain. Do not drive yourself if you feel faint.

What Is Hemochezia?

Hemochezia refers to the passage of visible blood through the rectum, with or without stool. The blood is often bright red or maroon and commonly originates from the lower gastrointestinal tract, including the colon, rectum or anus.

However, severe bleeding from the upper gastrointestinal tract can occasionally pass rapidly through the intestines and appear as fresh red blood. Therefore, blood colour alone cannot reliably identify the source.

The term rectal bleeding is commonly used in patient information, while hematochezia is the medical term often used for visibly bloody rectal passage. Both describe a symptom, not a final diagnosis.

What Does Blood in Stool Look Like?

Bright red blood

May appear on toilet paper, on the surface of stool or in the toilet bowl. Possible causes include hemorrhoids and anal fissures, although other causes must be considered.

Blood mixed with stool

May suggest bleeding from higher in the rectum or colon, but appearance alone cannot establish the source. Inflammation, polyps and other bowel disorders are among the possibilities.

Dark red or maroon stool

Can occur with intestinal bleeding, including bleeding from the colon or small intestine. Prompt medical assessment is important, especially when bleeding is substantial.

Black, tarry stool

May indicate digested blood from bleeding in the upper gastrointestinal tract. Iron supplements and some foods can also darken stool, but black tarry stool needs urgent medical assessment.

Remember: Blood colour, amount and associated symptoms can help guide assessment, but they cannot safely replace a clinical evaluation.

Common Causes of Hemochezia

1. Hemorrhoids (piles)

Hemorrhoids are swollen vascular structures in or around the anus and lower rectum. They may cause bright red bleeding during or after a bowel movement. Internal hemorrhoids may bleed without significant pain, while external hemorrhoids can cause discomfort, itching or swelling.

Constipation and straining can aggravate symptoms. Nevertheless, rectal bleeding should not automatically be attributed to hemorrhoids, particularly when it is new, persistent or accompanied by other warning signs.

Read our guide: Hemorrhoids: Symptoms, Causes, Treatment and Prevention.

2. Anal fissure

An anal fissure is a small tear in the lining of the anal canal. It often causes sharp pain during bowel movements, burning afterward and a small amount of bright red blood on toilet paper or on the stool surface.

Hard stool and constipation are common triggers. Persistent or recurrent fissures may require medical treatment rather than dietary changes alone.

Related reading: Constipation: Causes and Treatment.

3. Diverticular bleeding

Diverticula are small pouches that can develop in the wall of the colon. A blood vessel associated with a diverticulum may bleed, sometimes producing a substantial amount of red or maroon blood. Significant bleeding requires urgent assessment.

4. Colitis and inflammatory bowel disease

Inflammation of the colon may cause blood in stool, diarrhoea, abdominal cramps, urgency or mucus. Causes include ulcerative colitis, Crohn’s disease, infection and reduced blood supply to the bowel.

Bloody diarrhoea, fever, dehydration or severe abdominal pain should be assessed promptly.

5. Colorectal polyps and colorectal cancer

Polyps are growths that develop in the lining of the colon or rectum. Some polyps can bleed, and some can develop into colorectal cancer over time. Colorectal cancer may present with blood in stool, a persistent change in bowel habits, unexplained weight loss, iron-deficiency anaemia or abdominal symptoms.

These symptoms do not automatically mean cancer, but they should not be ignored. Early assessment can help identify the cause and guide treatment.

Learn more: Colon Cancer: Symptoms, Diagnosis and Treatment.

6. Other causes

Intestinal infections that cause bloody diarrhoea.
Abnormal blood vessels in the gastrointestinal tract.
Bleeding after some bowel procedures or injuries.
Medicines that increase bleeding risk, including anticoagulants and certain antiplatelet medicines.
Less commonly, rapid and severe bleeding from an upper gastrointestinal source.

Clinical principle: The amount of blood, the patient’s vital signs, associated symptoms, medication history and underlying risk factors all influence how urgently the bleeding needs investigation.

Symptoms That May Accompany Rectal Bleeding

The associated symptoms can provide clues about the possible cause:

Symptom pattern	Possible explanation	What to do
Bright red blood with pain during defecation	Anal fissure or another anal condition	Arrange assessment if persistent, recurrent or painful.
Bright red bleeding with itching or a lump	Hemorrhoids may be responsible	Do not assume the diagnosis without appropriate assessment.
Bloody diarrhoea with cramps or fever	Infection or inflammatory bowel disease, among other causes	Seek prompt medical care.
Blood with a persistent change in bowel habits	Several bowel disorders, including polyps or colorectal cancer	Arrange medical assessment.
Heavy bleeding with dizziness, faintness or weakness	Potentially significant blood loss	Seek emergency medical care.

How Is Hemochezia Diagnosed?

The aim of evaluation is to determine the source of bleeding, assess its severity and identify the underlying cause. Not everyone needs the same tests.

1. Medical history

A clinician may ask about the amount and colour of blood, whether it is mixed with stool, pain during defecation, diarrhoea, constipation, changes in bowel habits, weight loss, previous episodes and family history of colorectal disease.

It is also important to report medicines, particularly anticoagulants, antiplatelet drugs, aspirin and non-steroidal anti-inflammatory drugs (NSAIDs).

2. Physical examination

Depending on the situation, examination may include checking vital signs, assessing the abdomen and examining the anal area. A digital rectal examination or anoscopy may be appropriate in selected patients.

3. Blood tests

A complete blood count may help assess anaemia and the impact of blood loss. Other tests depend on the clinical findings and may include kidney function, clotting studies or tests for inflammation.

4. Stool tests

Stool testing may be useful when infection or another specific cause is suspected. The appropriate test depends on the symptoms and clinical context.

5. Colonoscopy or other investigations

Colonoscopy allows a clinician to examine the colon and rectum and, when appropriate, take tissue samples or treat some sources of bleeding. It may be recommended for persistent or unexplained bleeding, concerning symptoms or relevant colorectal screening needs.

Depending on the severity and suspected source, clinicians may use flexible sigmoidoscopy, upper endoscopy, CT angiography or other investigations. Significant active bleeding may require hospital-based evaluation.

Read our guide: Colonoscopy: Preparation, Procedure and What to Expect.

Treatment of Hemochezia

Treatment depends on the underlying cause and the severity of bleeding. There is no single medicine or home remedy that safely treats every case of blood in stool.

Hemorrhoids or fissure

Management may include stool-softening strategies, fibre, appropriate fluid intake, avoiding straining and condition-specific treatment recommended by a clinician.

Infection or colitis

Treatment depends on the diagnosis. Some infections require specific treatment, while inflammatory bowel disease may need specialist-directed medication.

Polyps or colorectal disease

Depending on the findings, management may involve endoscopic removal, biopsy, surgery or specialist care.

Significant gastrointestinal bleeding

Hospital treatment may include intravenous fluids, blood transfusion when indicated, endoscopic therapy, radiological procedures or surgery.

Do not start antibiotics, rectal medicines or other treatments solely because you have noticed blood in stool. Treatment should be guided by the suspected or confirmed cause.

What Should You Do at Home?

If the bleeding is small and has stopped, you still need to consider the circumstances and seek medical advice when appropriate. Home care is not a substitute for assessing unexplained or recurrent bleeding.

Observe and report: Note the colour, approximate amount, frequency and any associated pain or bowel changes.
Avoid straining: If constipation is present and there are no obstruction symptoms, improve bowel habits and discuss suitable treatment with a clinician or pharmacist.
Eat fibre-rich foods: Vegetables, fruit, pulses and whole grains may help maintain softer stool.
Use fibre supplements carefully: Ispaghula husk may help constipation when appropriate, but it does not diagnose or treat every cause of rectal bleeding.
Review your medicines: Tell your clinician about blood thinners and other medicines that may increase bleeding risk. Do not stop prescribed anticoagulants or antiplatelet medicines without medical advice.
Do not delay assessment: Seek medical care for persistent, recurrent or unexplained bleeding.

Related DoctorsGang Guides

When Should You Seek Urgent Medical Care?

Go to an emergency department if:

Bleeding is heavy, continues or repeatedly fills the toilet bowl with blood.
You pass large blood clots.
You feel faint, severely dizzy, confused or unusually weak.
You develop severe or worsening abdominal pain.
You have black, tarry stool or substantial dark-red bleeding.
You have bloody diarrhoea with severe symptoms or signs of dehydration.

Heavy gastrointestinal bleeding can be life-threatening. Do not wait for a routine appointment if you have signs of significant blood loss.

Even without emergency symptoms, arrange a medical assessment for unexplained bleeding, recurrent episodes, persistent changes in bowel habits, unexplained weight loss or unusual tiredness that may indicate anaemia.

Frequently Asked Questions About Hemochezia

1. What does hemochezia mean?

Hemochezia means passing visible blood through the rectum, often bright red or maroon. It is a symptom, not a diagnosis, and the source must be assessed when appropriate.

2. Is bright red blood in stool always caused by hemorrhoids?

No. Hemorrhoids and anal fissures are common causes, but inflammation, intestinal bleeding, polyps and colorectal cancer are also possible. Do not assume the cause based on colour alone.

3. What is the difference between hematochezia and melena?

Hematochezia generally describes visible red or maroon blood passed through the rectum. Melena refers to black, tarry stool that commonly results from digested blood. Severe upper gastrointestinal bleeding can occasionally cause hematochezia.

4. Can constipation cause blood in stool?

Hard stool and straining can contribute to an anal fissure or aggravate hemorrhoids, both of which may bleed. However, persistent or unexplained bleeding should not be attributed to constipation without assessment.

5. Can an anal fissure cause bright red blood?

Yes. An anal fissure can cause a small amount of bright red blood, often with sharp pain during or after a bowel movement. A clinician can help confirm the cause and recommend suitable treatment.

6. Is painless rectal bleeding serious?

It can have a relatively minor cause, but painless bleeding may also occur with conditions that need treatment. The amount, recurrence, medical history and associated symptoms determine how urgently it should be assessed.

7. Can colorectal cancer cause blood in stool?

Yes. Colorectal cancer may cause visible bleeding, changes in bowel habits, unexplained weight loss or anaemia. Many other conditions can cause similar symptoms, so assessment is necessary rather than trying to diagnose cancer from symptoms alone.

8. Which tests are used to investigate blood in stool?

Depending on the clinical situation, evaluation may include physical examination, blood tests, stool tests, anoscopy, colonoscopy or imaging. Not every patient requires every test.

9. Should I take antibiotics for bloody stool?

Not without medical advice. Antibiotics are useful for certain infections but are unnecessary or inappropriate for many other causes. The correct treatment depends on the diagnosis and severity.

10. When is rectal bleeding an emergency?

Seek emergency care for heavy or ongoing bleeding, large clots, faintness, severe dizziness, marked weakness, severe abdominal pain or other signs of significant blood loss.

11. Can ispaghula husk stop rectal bleeding?

Ispaghula husk can help soften stool and reduce straining in some people with constipation. It does not directly treat every cause of bleeding and must not delay medical assessment of unexplained or recurrent blood in stool.

12. Should blood in stool be checked if it happens only once?

A single small episode may have a minor cause, but it is not possible to confirm that from appearance alone. Seek medical advice, particularly if the cause is unclear, the bleeding recurs or you have other symptoms or risk factors.

Conclusion

Hemochezia, or visible rectal bleeding, can arise from conditions ranging from hemorrhoids and anal fissures to inflammatory bowel disease, diverticular bleeding and colorectal cancer. The colour and amount of blood may offer clues, but they cannot establish the diagnosis on their own.

Prompt assessment is important for persistent or unexplained bleeding, and emergency care is necessary when bleeding is heavy or accompanied by faintness, severe weakness or severe abdominal pain. Appropriate treatment depends on identifying the underlying cause.

Medical References

Medical disclaimer: This article is for general educational purposes and does not replace individual medical assessment, diagnosis or treatment. Rectal bleeding may have serious causes; seek appropriate care based on the amount of bleeding and associated symptoms.