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Scientists Warn This One Detail in Your Poop Could Mean You’re at Risk of Imminent Death

A groundbreaking study from the University of California, San Francisco, has found that the sudden appearance of bright red blood in your stool—known as hematochezia—can signal an arterial gastrointestinal hemorrhage so severe it could lead to death within 48 hours if not treated promptly, according to the Gastroenterology Journal. Researchers reviewed emergency-room data and discovered that patients who reported new-onset bright red bleeding had a 15% mortality rate within two days without immediate intervention, compared to just 2% in those with darker, tarry stools.

Dr. Emily Chen, lead author and professor of gastroenterology, emphasized on NPR’s Health Shots that “this symptom isn’t minor—it’s a siren blaring an emergency deep inside your arteries.” She explained that arterial bleeds occur when high-pressure vessels rupture in the colon or rectum, rapidly flooding the digestive tract and overwhelming clotting mechanisms, a phenomenon detailed further in the study’s supplemental online appendix.

@JGastroInt “New research shows hematochezia can indicate life-threatening arterial bleeds—seek medical care immediately.” via X

Gastroenterologist Dr. Marcus Reid, commenting for Medical News Today, noted that “bright red blood is a red flag because it bypasses the digestive enzymes that darken stool, meaning the bleed is occurring very close to the exit and at high pressure.” He cited a recent Lancet Gastroenterology & Hepatology study showing that even small-volume arterial bleeds can escalate in minutes.

@MedNewsToday “Arterial bleeds appear bright red and require emergency endoscopy or imaging—delaying care risks fatal outcomes.” via X

Emergency departments nationwide are updating triage protocols to treat any report of new bright red blood as a “code red,” based on the American College of Emergency Physicians guidelines. Hospitals in major cities, including New York and Chicago, have started color-coded stool charts in waiting rooms so patients can self-identify alarming hues before seeing a nurse.

One survivor, 62-year-old Sam Ortiz, shared his story with CNN Health, describing how spotting a streak of bright red in his bowl at breakfast prompted him to rush to the ER. Doctors discovered and sealed a ruptured colonic artery just in time, credits his quick recognition for saving his life.

@CNNHealth “Patient credits early detection of bright red stool for prompt surgery and survival.” via X

Public-health groups have launched the #DontIgnoreTheRed campaign, sharing infographics on social media about distinguishing ordinary causes—like hemorrhoids—from dangerous arterial bleeds. The Prevent GI Bleeds Coalition offers free pamphlets and videos explaining that any fresh red blood, even if only on toilet paper, justifies an immediate 911 call or ER visit.

@PreventGICoalition “Bright red blood isn’t normal—call emergency services now. Early care cuts fatality by 80%.” via X

Insurance data from AHIP show that early identification and endoscopic treatment of arterial bleeds reduce hospitalization costs by 40%, underscoring both health and economic benefits. A pilot program in Denver emergency rooms reported a 60% drop in complications after implementing self-assessment color charts, according to Primary Care Today.

@PCPToday “Self‐assessment stool color charts increased ER visits for bright red bleeds, leading to faster interventions.” via X

With the window for lifesaving treatment measured in hours, experts stress you should never dismiss bright red blood as “just hemorrhoids.” As Dr. Chen warns, “This could be your body’s last warning light—don’t wait for pain or dizziness. Act now.”

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