What is a common cause of melena, or dark-colored stool?

What is a common cause of melena, or dark-colored stool?

• A. Gastroenteritis
• B. Peptic Ulcer Disease
• C. Hemorrhoids
• D. Gastric reflux

Answer: (B)

Melena is characterized by the passage of dark-colored, tarry stools, which is typically a result of bleeding in the upper gastrointestinal tract. Peptic ulcer disease is a significant and common cause of this condition. It involves ulceration in the stomach or the first part of the small intestine, which can lead to bleeding. When blood is digested in the gastrointestinal system, it transforms into a dark, tar-like substance that appears in the stool, indicating that the source of the bleeding is located higher up in the digestive tract. In contrast, gastroenteritis usually causes diarrhea that is more watery rather than dark-colored and is less often associated with upper GI bleeding. Hemorrhoids generally lead to bright red blood in the stool, indicative of lower gastrointestinal bleeding rather than melena. Gastric reflux does not lead to bleeding or dark stools, as it primarily involves the backflow of stomach acid into the esophagus rather than blood loss from the upper GI tract. Thus, peptic ulcer disease is the most relevant and direct cause of melena.

Melena is characterized by the passage of dark-colored, tarry stools, which is typically a result of bleeding in the upper gastrointestinal tract. Peptic ulcer disease is a significant and common cause of this condition. It involves ulceration in the stomach or the first part of the small intestine, which can lead to bleeding. When blood is digested in the gastrointestinal system, it transforms into a dark, tar-like substance that appears in the stool, indicating that the source of the bleeding is located higher up in the digestive tract.

In contrast, gastroenteritis usually causes diarrhea that is more watery rather than dark-colored and is less often associated with upper GI bleeding. Hemorrhoids generally lead to bright red blood in the stool, indicative of lower gastrointestinal bleeding rather than melena. Gastric reflux does not lead to bleeding or dark stools, as it primarily involves the backflow of stomach acid into the esophagus rather than blood loss from the upper GI tract. Thus, peptic ulcer disease is the most relevant and direct cause of melena.