Melena (black stool) is a symptom of internal bleeding, usually in your upper gastrointestinal (GI) tract. The blood turns black as it travels through your digestive system before coming out in your poop. What is melena (black stool)?

2025年3月4日 · Melena refers to black stools that occur as a result of gastrointestinal bleeding. This bleeding typically originates from the upper gastrointestinal (GI) tract, which includes the mouth, esophagus, stomach, and the first part of the small intestine.

Melena is a form of blood in stool which refers to the dark black, tarry feces that are commonly associated with upper gastrointestinal bleeding. [1] The black color and characteristic strong odor are caused by hemoglobin in the blood being altered by digestive enzymes and intestinal bacteria. [2]

2024年4月1日 · Melena is when blood causes stools to appear black, tarry, and foul-smelling. The blood is dark because it is coming from somewhere in the upper digestive system, including the esophagus (food tube), stomach, and small intestine.

2025年2月7日 · Hematochezia and melena are two terms that describe different ways blood can appear in your stool. Hematochezia is bright red blood that generally starts lower in the digestive tract. Melena generally starts much higher up in the digestive tract and results in …

2018年3月27日 · Gastrointestinal (GI) bleeding is usually categorized as either melena or hematochezia. Melena refers to black stools, while hematochezia refers to fresh, red blood in your stool. This blood...

2025年3月10日 · Melena is blood in your bowel movements. This is caused by bleeding in your upper gastrointestinal (GI) system or large bowel. Your bowel movements may be black or tarry, and have a foul odor. They may also be shiny or sticky. What causes melena? How is the cause of melena diagnosed? Your healthcare provider will ask about your symptoms.

Melena is the passage of black, tarry stools. Hematochezia is the passage of fresh blood per anus, usually in or with stools. Hematemesis is the vomiting of blood, which may be obviously red or have an appearance similar to coffee grounds.

2024年11月14日 · Melena, a clinical term derived from the Greek word "melas" meaning black, refers to the passage of dark, tarry stools resulting from the presence of upper gastrointestinal (GI) blood. This condition is a critical indicator of underlying pathology, often signaling hemorrhage in the upper GI tract.

2022年11月30日 · Melaena refers to a black tarry stool, which occurs as a result of upper gastrointestinal bleeding. Only 50mL of blood is needed to turn the stool black (a by-product of digested haemoglobin).