📋 Colonoscopy Center · Apgujeong Hana Clinic

Blood in Stool Seoul

English-friendly evaluation for bright-red blood, maroon stool, black tarry stool or hidden digestive bleeding, with specialist assessment and targeted testing in Gangnam.

✓ Bleeding-source assessment ✓ Blood tests and endoscopy ✓ English results and follow-up

💬 Ask About Blood in Stool 📞 02) 3443-7550

Stool Colour & Bleeding Pattern What did the blood or stool look like?

🔎

Bright-Red Blood May appear on paper, on the stool, in the bowl or mixed with stool.

Lower source possible

Dark Red or Maroon May occur with bleeding from the colon or another digestive location.

Prompt assessment

Black, Sticky or Tarry Stool May represent digested blood from the upper digestive tract.

Urgent assessment

Hidden or Occult Blood May be identified through a stool test, anaemia or low iron.

Further testing

Colour can provide clues but cannot confirm the location or cause. Medicines, supplements and food may also alter stool colour.

🩸 Do Not Assume Haemorrhoids Haemorrhoids are common, but other conditions can cause similar bleeding.

🧪 Check For Anaemia Slow bleeding may cause low haemoglobin, fatigue or iron deficiency.

📹 Endoscopy When Needed Colonoscopy or gastroscopy may be selected according to the suspected source.

⚠️ Urgency Depends On Severity Heavy bleeding, black stool or weakness may require emergency care.

✓ Board-Certified Gastroenterologist ✓ Certified Endoscopy Sub-Specialist ✓ English Consultation & Results ✓ Apgujeong · Gangnam

Understanding Digestive Bleeding

Blood in stool is a symptom—not a final diagnosis.

Bleeding can begin anywhere in the digestive tract, including the esophagus, stomach, small intestine, colon, rectum or anus.

The appearance may range from a small bright-red streak to dark-maroon blood, black tarry stool or bleeding that is invisible without laboratory testing.

Some causes are minor and treatable. Others require prompt investigation, especially when bleeding is repeated, unexplained or accompanied by anaemia, pain, weight loss or bowel-habit changes.

🔴 Visible Bleeding Blood may be seen on toilet paper, coating the stool, mixed with stool or filling the bowl.

⬛ Black Tarry Stool Digested blood may produce black, sticky stool with a strong or unusual smell.

🧫 Occult Bleeding Small amounts may be detected only through stool testing or investigation of anaemia.

📋 Different Causes Possible sources range from haemorrhoids and fissures to inflammation, polyps or cancer.

What The Appearance May Suggest

Colour and pattern provide clues—but they do not locate the source reliably.

Bright-Red Blood

HEMATOCHEZIA

Often associated with the anus, rectum or lower colon. Possible causes include haemorrhoids, an anal fissure, proctitis, diverticular bleeding, colitis, polyps or colorectal cancer.

Maroon or Dark-Red Stool

FASTER OR HIGHER BLEEDING POSSIBLE

Dark-red blood may arise from the colon, small intestine or occasionally a rapidly bleeding upper-digestive source. The amount and associated symptoms affect urgency.

Black, Sticky or Tarry Stool

MELENA

This pattern commonly suggests digested blood from the esophagus, stomach or upper small intestine and should receive prompt medical assessment.

Hidden Blood

OCCULT BLEEDING

The stool may look normal while small amounts of blood are detected by laboratory testing or suspected because of iron-deficiency anaemia.

💊

Some medicines and foods can change stool colour

Iron, bismuth-containing medicines and selected foods can make stool appear dark. However, new black tarry stool should not automatically be attributed to medicine without clinical review.

Possible Causes

Digestive bleeding has many possible sources.

The cause cannot be confirmed from stool appearance alone. Evaluation considers age, symptoms, medicines, medical history and previous screening.

🔴 Haemorrhoids Internal haemorrhoids may cause painless bright-red blood on stool, toilet paper or in the toilet bowl.

⚡ Anal Fissure A small tear may cause bright-red bleeding with sharp pain during or after bowel movements.

🧱 Diverticular Bleeding Pouches in the colon wall can sometimes bleed suddenly and may produce red or maroon blood.

🔥 Inflammation or Colitis Ulcerative colitis, Crohn’s disease, proctitis, infection or reduced blood flow may cause bloody stool.

🔬 Colon Polyps Some polyps may bleed slowly or intermittently and can be detected during colonoscopy.

🎗️ Colorectal Cancer Cancer may cause visible or hidden bleeding, anaemia and changes in bowel habits.

🥣 Upper-Digestive Bleeding Ulcers, gastritis and other upper-digestive conditions may cause black tarry stool.

💊 Medication-Related Bleeding Blood thinners, anti-inflammatory pain relievers and other medicines may increase bleeding risk.

⚠️

Do not assume repeated bleeding is only from haemorrhoids

Haemorrhoids are common, but another condition may coexist. Persistent or unexplained bleeding should be assessed according to age, colorectal risk and associated symptoms.

Blood in Stool vs Rectal Bleeding

These terms overlap but are not always identical.

🩸

Blood in Stool

This is a broad symptom that includes red blood mixed with stool, maroon stool, black tarry stool and blood that is detected only through laboratory testing.

🔴

Rectal Bleeding

This commonly describes blood passing from the rectum or anus, such as bright-red blood on toilet paper, on the stool or in the toilet bowl.

View the Rectal Bleeding page →

Medical Evaluation

Testing is selected according to the bleeding pattern and overall risk.

🩺

The first step is understanding what happened.

The gastroenterologist reviews the appearance, amount, duration, frequency, associated symptoms, medicines and previous digestive or colorectal history.

🎨 Blood Appearance Bright red, dark red, maroon, black, mixed with stool or visible only on paper.

⏱️ Timing & Frequency One isolated episode differs from repeated, increasing or continuous bleeding.

🚽 Bowel Symptoms Constipation, diarrhea, urgency, pain, mucus and a persistent change in stool pattern are reviewed.

📉 General Symptoms Weight loss, tiredness, dizziness, fever, reduced appetite and abdominal pain may influence urgency.

💊 Medicine Review Blood thinners, aspirin, anti-inflammatory pain medicines, iron and bismuth are discussed.

🧬 Personal & Family Risk Previous polyps, colorectal cancer screening and family history help determine the investigation.

Possible Tests

Not every patient needs the same examination.

Blood Count

May identify anaemia or a reduction in haemoglobin associated with acute or ongoing blood loss.

Blood Test

Iron Studies

May assess iron deficiency when bleeding has been slow, intermittent or hidden.

Chronic Blood Loss

Stool Testing

May detect hidden blood, infection or intestinal inflammation, depending on the symptoms.

Selected Cases

Rectal Examination

May help identify haemorrhoids, fissures, masses or another local source when appropriate.

Physical Examination

Colonoscopy

Examines the colon for polyps, cancer, inflammation, diverticular disease and other potential bleeding sources.

Lower GI Evaluation

Gastroscopy

May be selected for black tarry stool, vomiting blood or another suspected upper-digestive source.

Upper GI Evaluation

Imaging

CT-based or vascular imaging may be needed in selected patients with significant or active bleeding.

Urgent or Complex Cases

🧫

A positive stool-blood test does not identify the exact cause

Hidden blood may occur with haemorrhoids, inflammation, polyps, colorectal cancer or another condition. Additional evaluation is usually required to locate the source.

When Colonoscopy May Be Recommended

Colonoscopy can directly examine the colon and rectum.

🩸 Unexplained Bleeding Recurrent or unexplained red or maroon blood may require direct colon evaluation.

🧪 Iron-Deficiency Anaemia Hidden digestive blood loss may need investigation even when stool appears normal.

📄 Positive Stool Test An abnormal colorectal screening stool test generally requires diagnostic colonoscopy.

🚽 Bowel-Habit Change Bleeding combined with persistent constipation, diarrhea or another new bowel change may require investigation.

🔬 Previous Polyps Previous colon polyps or overdue surveillance may affect the decision and timing.

🧬 Family History Colorectal cancer or advanced polyps in a close relative may increase concern.

🎂 Age & Screening Status Age and whether colorectal screening is current are considered during evaluation.

✂️ Polyp Removal Many suitable polyps found during colonoscopy can be removed during the same procedure.

Emergency Warning Signs

Heavy or unstable bleeding may require emergency medical care.

🩸 Large Amounts Of Blood Heavy bleeding, repeated clots or a toilet bowl filling with blood requires urgent assessment.

⬛ Black Tarry Stool New black, sticky or tar-like stool may indicate upper-digestive bleeding.

😵 Fainting Or Dizziness Lightheadedness, fainting, confusion or severe weakness may indicate significant blood loss.

❤️ Rapid Heartbeat A fast heartbeat, chest discomfort or shortness of breath with bleeding requires urgent care.

🤕 Severe Abdominal Pain Intense or worsening pain with bleeding may indicate a serious intestinal condition.

🤮 Vomiting Blood Red blood or coffee-ground-like vomit requires immediate medical assessment.

Before Your Appointment

A few details can help identify the likely source.

🎨 Describe The Colour Note whether the blood was bright red, dark red, maroon, black or detected only through testing.

📍 Describe Where It Appeared Was it on paper, coating the stool, mixed through the stool, dripping or filling the toilet?

📅 Record The Timing Note when it began, how often it occurs and whether the amount is increasing.

🚽 Record Bowel Changes Include constipation, diarrhea, urgency, mucus, pain or a change in stool form.

💊 Bring A Medicine List Include blood thinners, aspirin, pain relievers, iron, bismuth and supplements.

📄 Bring Previous Reports Previous colonoscopy, gastroscopy, pathology, stool-test and blood-test results are helpful.

Your Clinic Visit

How blood-in-stool evaluation works.

Assess Urgency The amount of bleeding and any dizziness, weakness, pain or black stool are reviewed first.

Identify The Pattern We review blood colour, location, bowel symptoms, medicines and colorectal risk.

Select The Evaluation Blood tests, examination, stool tests, colonoscopy or gastroscopy may be selected.

Treat & Follow Up Results are explained in English with treatment, pathology or surveillance guidance.

FAQ

Blood-in-stool questions, answered.

Visible blood should not be ignored, especially when it is repeated, increasing or associated with other symptoms.

💬 WhatsApp The Clinic 📞 02) 3443-7550

Is bright-red blood always caused by haemorrhoids? +

No. Haemorrhoids are a common cause, but fissures, inflammation, diverticular disease, polyps, colorectal cancer and other conditions can produce similar bleeding.

What does black tarry stool mean? +

Black, sticky or tar-like stool may represent digested blood from the esophagus, stomach or upper small intestine. New black tarry stool requires prompt medical assessment.

Can iron medicine make stool black? +

Iron and some bismuth-containing medicines can darken stool. However, black sticky stool, weakness, dizziness or another bleeding symptom should not automatically be attributed to medicine.

Do I always need colonoscopy? +

No. Testing depends on the appearance, amount, age, medicines, symptoms and suspected source. Colonoscopy may be recommended for unexplained bleeding, anaemia, abnormal stool testing, bowel changes or colorectal risk.

Can a stool test diagnose the cause? +

A stool test can detect hidden blood but cannot identify the exact source. A positive result usually requires additional evaluation.

Is a small amount of blood serious? +

A small amount may come from a minor cause, but repeated or unexplained bleeding still needs assessment. Urgency increases with heavy bleeding, black stool, anaemia, pain, weight loss or weakness.

When should I go to an emergency department? +

Seek emergency care for heavy bleeding, clots, black tarry stool with weakness, fainting, rapid heartbeat, breathing difficulty, vomiting blood or severe abdominal pain.

How do I book an English consultation? +

Message WhatsApp +82 10-2950-7551, call 02) 3443-7550 or use Naver Booking. Describe the blood colour, amount, timing and any associated symptoms.

Related Colonoscopy Services

Explore related bleeding, screening and colonoscopy pages.

Noticed blood in your stool or a positive stool test?

Book an English-friendly gastroenterology consultation at Apgujeong Hana Clinic in Gangnam for individual assessment and appropriate testing.

💬 WhatsApp To Book 🗓 Naver Booking 📞 02) 3443-7550