Melena vs. Hematochezia: Know the Difference

By Shumaila Saeed || Updated on December 25, 2023

Melena is black, tarry stool due to digested blood, typically indicating upper GI bleeding. Hematochezia is bright red blood in stool, suggesting lower GI bleeding.

Melena vs. Hematochezia

Key Differences

Melena is characterized by black, tarry stools, which are a result of blood that has been digested, typically indicating bleeding in the upper gastrointestinal (GI) tract. Hematochezia, in contrast, presents as bright red or maroon blood in the stool, usually signifying bleeding in the lower GI tract, such as the colon or rectum.

Dec 07, 2023

The cause of melena often includes ulcers, cancers, or varices in the upper GI tract. Hematochezia's causes are more varied, including hemorrhoids, inflammatory bowel disease, or colorectal cancer, affecting the lower GI areas.

Dec 07, 2023

The appearance of melena, black and sticky, is due to the digestion of blood as it travels through the GI tract, a process that takes time. Hematochezia's bright red color is because the blood has not been digested and indicates a more rapid or recent bleeding closer to the rectum.

Dec 07, 2023

Melena is usually indicative of a more serious condition and often requires urgent medical attention. Hematochezia, while also needing medical evaluation, can result from conditions that are often less immediately severe.

Dec 07, 2023

In diagnosing melena, upper endoscopy is commonly employed. For hematochezia, colonoscopy is often the diagnostic tool of choice, aimed at visualizing the lower GI tract to identify the source of bleeding.

Dec 07, 2023

ADVERTISEMENT

Comparison Chart

Color of Stool

Black and tarry

Bright red or maroon

Dec 07, 2023

Typical Location

Upper GI tract (e.g., stomach, small intestine)

Lower GI tract (e.g., colon, rectum)

Dec 07, 2023

Common Causes

Ulcers, cancers, varices

Hemorrhoids, inflammatory bowel disease, cancer

Dec 07, 2023

Indication of Severity

Often indicates serious conditions

Can range from minor to serious conditions

Dec 07, 2023

Diagnostic Procedure

Upper endoscopy

Colonoscopy

Dec 07, 2023

ADVERTISEMENT

Melena and Hematochezia Definitions

Melena

Black Stool

The patient's melena was indicative of an upper GI bleed.

Dec 07, 2023

Hematochezia

Lower GI Bleeding

The doctor suspected a lower GI source for the hematochezia.

Dec 07, 2023

Melena

Tarry Consistency

The tarry consistency of her stool suggested melena.

Dec 07, 2023

Hematochezia

Colon Issue Indicator

The occurrence of hematochezia led to a colonoscopy.

Dec 07, 2023

Melena

Chronic Bleeding Sign

Melena can be a sign of chronic internal bleeding.

Dec 07, 2023

ADVERTISEMENT

Hematochezia

Bright Red Stool

Hematochezia was evident with the bright red blood in his stool.

Dec 07, 2023

Melena

Digestive Bleeding

Melena often results from bleeding in the stomach.

Dec 07, 2023

Hematochezia

Fresh Blood Sign

Hematochezia usually indicates fresh blood in the stool.

Dec 07, 2023

Melena

Upper GI Issue Indicator

The presence of melena prompted an upper endoscopy.

Dec 07, 2023

Hematochezia

Rectal Bleeding

Hematochezia can often result from rectal bleeding.

Dec 07, 2023

Melena

The passage of black, tarry stools composed largely of blood that has been acted on by gastric juices, indicative of bleeding in the upper digestive tract.

Oct 19, 2023

Hematochezia

(medicine) The presence of fresh (bright red) blood in stools, often due to lower gastrointestinal bleeding.

Oct 19, 2023

Melena

The passage of dark, tarry stools containing blood, a result of upper gastrointestinal bleeding.

Oct 19, 2023

Hematochezia

Passage of stools containing blood (as from diverticulosis or colon cancer or peptic ulcer)

Oct 19, 2023

Melena

See Melæna.

Oct 19, 2023

Melena

Abnormally dark tarry feces containing blood (usually from gastrointestinal bleeding)

Oct 19, 2023

Repeatedly Asked Queries

What color is melena?

Black and tarry.

Dec 07, 2023

Is hematochezia bright red?

Yes, it's bright red or maroon.

Dec 07, 2023

How serious is melena?

It's often a sign of a serious condition.

Dec 07, 2023

Can hematochezia be caused by hemorrhoids?

Yes, among other lower GI issues.

Dec 07, 2023

Does melena require urgent medical attention?

Yes, it usually does.

Dec 07, 2023

Is melena a sign of chronic bleeding?

It can indicate chronic internal bleeding.

Dec 07, 2023

How fast does hematochezia indicate bleeding?

It suggests rapid or recent bleeding.

Dec 07, 2023

Can hematochezia appear as maroon in color?

Yes, it can be bright red or maroon.

Dec 07, 2023

Where does hematochezia typically originate?

From the lower GI tract.

Dec 07, 2023

Is hematochezia always serious?

It can range from minor to severe conditions.

Dec 07, 2023

What causes melena?

Commonly caused by upper GI bleeding, like ulcers.

Dec 07, 2023

Does hematochezia indicate a need for medical evaluation?

Yes, medical assessment is necessary.

Dec 07, 2023

What is a diagnostic tool for hematochezia?

Colonoscopy is commonly used.

Dec 07, 2023

What does melena indicate about the location of bleeding?

Bleeding in the upper GI tract.

Dec 07, 2023

Can diet affect the appearance of hematochezia?

Certain foods can affect color, but true hematochezia is due to bleeding.

Dec 07, 2023

What lower GI conditions cause hematochezia?

Conditions like inflammatory bowel disease or colorectal cancer.

Dec 07, 2023

Is the appearance of melena due to digested blood?

Yes, it's black due to digestion.

Dec 07, 2023

What is the consistency of melena?

Sticky and tar-like.

Dec 07, 2023

Can melena be caused by stomach cancer?

Yes, among other conditions.

Dec 07, 2023

Are ulcers a common cause of melena?

They are one of the common causes.

Dec 07, 2023

Share this page

Link for your blog / website

HTML

Link to share via messenger

Moderate vs. Mild

Melena vs. Hematochezia

Beauty vs. Beautiful

Melena vs. Hematochezia

About Author

Written by

Shumaila Saeed, an expert content creator with 6 years of experience, specializes in distilling complex topics into easily digestible comparisons, shining a light on the nuances that both inform and educate readers with clarity and accuracy.

Trending Comparisons

Virtual vs. Digital

Virtual vs. Digital

September 26, 2025

Virtual refers to something simulated by computer technology, while digital denotes data represented in binary form.

Smarter vs. More Smart

Smarter vs. More Smart

September 25, 2025

"Smarter" is the comparative form of "smart," commonly used in English; "more smart" is a less standard comparative form used for emphasis or stylistic reasons.

Samoan vs. Polynesian

Samoan vs. Polynesian

November 5, 2025

Samoan refers to the people, culture, and language of Samoa, a distinct nation within Polynesia, while Polynesian encompasses a broader group of cultures across the Pacific.

Central Standard Time vs. Eastern Standard Time

Central Standard Time vs. Eastern Standard Time

June 12, 2026

Central Standard Time (CST) is one hour behind Eastern Standard Time (EST), with CST aligning with UTC-6 and EST with UTC-5 during standard time.

Contemporary Art vs. Traditional Art

Contemporary Art vs. Traditional Art

July 30, 2025

Contemporary art, made from the late 20th century on, focuses on modern themes and techniques. Traditional art, pre-dating this, follows historical and cultural norms.

RMS vs. PMPO

August 9, 2025

RMS (Root Mean Square) measures continuous power handling in audio equipment, indicating sound quality and clarity. PMPO (Peak Music Power Output) represents peak power, often exaggerated for marketing.

Company vs. Factory

Company vs. Factory

May 8, 2026

A company is a business entity engaged in commercial, industrial, or professional activities, while a factory focuses on manufacturing goods through mass production.

Saudi Arabia vs. UAE

Saudi Arabia vs. UAE

September 19, 2025

Saudi Arabia is largest country in the Middle East, known for its oil wealth and conservative Islamic culture, whereas UAE, federation of seven emirates, is renowned for its progressive cities like Dubai and Abu Dhabi, blending modernity with tradition.

Maguey vs. Agave

Maguey vs. Agave

October 13, 2025

Maguey refers to specific Agave species used traditionally in Mexico for beverages and fibers, while Agave includes a broader genus of succulents, important in landscaping and tequila production.

Child vs. Kid

August 16, 2025

"Child" is a formal term referring to a young human being, often implying innocence and dependency, while "kid" is informal, suggesting familiarity and casualness.

Jewel vs. Jewelry

Jewel vs. Jewelry

June 24, 2026

Jewel is a precious stone or gem. Jewelry are ornaments like rings, necklaces, made often with jewels.

Cliff vs. Bluff

Cliff vs. Bluff

November 1, 2025

A cliff is a steep, high rock face, often along coastlines or mountains, while a bluff is a broad, rounded cliff often overlooking a river, valley, or other flat areas, with a steep face and a relatively flat top.

Strive vs. Thrive

Strive vs. Thrive

October 25, 2025

Strive involves making efforts towards a goal, while thrive denotes flourishing or prospering, often naturally.

Rite vs. Right

June 10, 2026

Rite refers to a ceremonial act or procedure, while right denotes correctness, entitlement, or direction. Both terms play distinct roles in language and culture.

Villainize vs. Vilify

Villainize vs. Vilify

October 8, 2025

Villainize involves portraying someone as a villain, emphasizing their negative traits. Vilify means to speak or write about in an abusively disparaging manner.

Firework vs. Firecracker

Firework vs. Firecracker

August 26, 2025

Fireworks are large-scale pyrotechnics used for public displays, while firecrackers are smaller, noise-focused explosives for personal use.

Shiva vs. Vishnu

Shiva vs. Vishnu

June 22, 2026

Shiva is a major Hindu deity symbolizing destruction and regeneration, while Vishnu represents preservation and the upkeep of the universe, both central figures in Hinduism with distinct roles in cosmic balance.

Falcon vs. Eagle

Falcon vs. Eagle

December 14, 2025

Falcons are smaller, faster birds known for their pointed wings and high-speed dives, while eagles are larger, possess broad wings, and showcase immense strength, especially in their talons.

Metro vs. Train

Metro vs. Train

October 11, 2025

Metro refers to an urban railway system for cities, typically underground; a train is a set of rail vehicles on railways, used for long or short distances.

Coach vs. Teacher

Coach vs. Teacher

November 11, 2025

A coach focuses on developing specific skills or achieving goals in sports or personal development, using hands-on methods. A teacher imparts academic knowledge, fostering understanding and critical thinking in a classroom setting.

Border vs. Boundary

Border vs. Boundary

December 11, 2025

A border is a line that marks the edges between countries, while a boundary delineates limits within countries, properties, or concepts.

Jazz Drum Kit vs. Rock Drum Kit

Jazz Drum Kit vs. Rock Drum Kit

June 21, 2026

Jazz Drum Kits are typically smaller, with lighter tones for subtlety and nuance; Rock Drum Kits are larger and louder, designed for powerful, driving rhythms.

Closet vs. Dresser

Closet vs. Dresser

December 5, 2025

A closet is a tall, enclosed storage space usually built into a room's walls for hanging or storing clothes, while a dresser is a piece of furniture with drawers for keeping clothes and often has a flat top for items.

Rectangular vs. Oblong

Rectangular vs. Oblong

June 11, 2026

Rectangular shapes have four right angles; oblong shapes are elongated rectangles, often perceived as longer in one direction.

Featured Comparisons

Helicopter vs. Chopper

Helicopter vs. Chopper

Coyote vs. Jackal

Coyote vs. Jackal

Cuddle vs. Snuggle

Cuddle vs. Snuggle

Hard Copy vs. Soft Copy

Hard Copy vs. Soft Copy

Fate vs. Destiny

Fate vs. Destiny