Red-colored stool is usually caused by something you ate, not by bleeding. Foods like beets, tomatoes, red gelatin, and red-dyed snacks or drinks can turn your stool noticeably red. But when the color comes from actual blood, the shade of red and where it appears can tell you a lot about what’s going on and whether it needs attention.
Foods That Turn Your Stool Red
Beets are the most common culprit. They contain a pigment your body doesn’t fully break down, so it passes through and colors your stool (and sometimes your urine) a deep red that can look alarming. Tomatoes, especially in large amounts like tomato soup or marinara sauce, can do the same thing. Red popsicles, fruit punch, red velvet cake, and anything with heavy red food dye will also show up in your stool a day or two later.
If you ate any of these foods in the past 24 to 72 hours, that’s likely your answer. The color should go away once the food works through your system. One way to check: think back over your last few meals. If you can trace the timing to a red-colored food, give it a day or two and see if the color returns to normal.
How to Tell Food From Blood
Food-related color changes tend to be mixed evenly throughout the stool, giving it an overall reddish or purplish tint. Blood, on the other hand, often looks different. It may appear as streaks on the surface, drips in the toilet water, or red smears on toilet paper. Blood also has a distinct look that’s harder to mistake once you’ve seen it: it’s usually brighter and more liquid than food dye residue, which tends to blend into the stool itself.
If you’re not sure, stop eating red-colored foods for two to three days. If the red disappears, food was the cause. If it persists, you’re likely seeing blood.
Bright Red Blood: Lower GI Sources
Bright red blood in your stool typically means the bleeding is coming from somewhere low in the digestive tract, usually the colon, rectum, or anus. The two most common causes are hemorrhoids and anal fissures, both of which are generally not dangerous.
Hemorrhoids are swollen blood vessels around the anus. They produce bright red blood that you’ll notice on toilet paper or dripping into the toilet bowl after a bowel movement. They often come with itching or a feeling of fullness near the anus, and they’re more common if you strain during bowel movements, sit for long periods, or are pregnant.
Anal fissures are small tears in the lining of the anus, usually caused by passing hard or large stools. The blood looks similar to hemorrhoid bleeding: bright red, on the surface of the stool or on toilet paper. The key difference is pain. Fissures typically cause a sharp, stinging sensation during and after a bowel movement, while hemorrhoids are more likely to itch or feel like pressure.
Both conditions usually improve on their own with more fiber, more water, and softer stools. They account for the majority of cases where people notice red blood after wiping.
Dark Red or Maroon Stool
The shade of red matters. Dark red or maroon-colored stool can mean the bleeding is coming from higher up in the colon or the small intestine. Blood that travels farther through the digestive tract gets partially broken down, which darkens its color. If your stool is black and tarry, that often points to bleeding even higher, such as in the stomach.
Diverticular bleeding is one cause of dark red stool. About 10% of people with diverticulosis (small pouches that form in the colon wall) experience some bleeding when hard stool scrapes against a blood vessel inside one of those pouches. This bleeding is usually painless and temporary, but it can produce a noticeable amount of fresh or dark red blood. Only about 3% of people with diverticulosis need treatment to stop persistent bleeding.
Inflammatory bowel conditions like ulcerative colitis can also cause blood in stool, often mixed with mucus and accompanied by cramping, diarrhea, and urgency. Colon polyps, which are small growths on the colon wall, sometimes bleed as well, though many people with polyps never notice symptoms.
Colorectal Cancer and Screening
Blood in stool can be a symptom of colorectal cancer, though this is far less common than the benign causes listed above. Colorectal cancer often produces no symptoms at all in its early stages, which is why screening matters even if you feel fine. The U.S. Preventive Services Task Force recommends screening for all adults starting at age 45 and continuing through age 75. If you have a family history of colorectal cancer or certain genetic conditions, screening may start earlier.
Persistent blood in your stool, especially if it’s dark red, accompanied by unexplained weight loss, or comes with a change in your bowel habits that lasts more than a few weeks, is worth getting checked out regardless of your age.
Signs That Need Immediate Attention
Most cases of red stool are harmless, but certain symptoms alongside it signal something more serious. Heavy bleeding that doesn’t stop, abdominal cramps or pain, feeling lightheaded or dizzy, shortness of breath, or unusual fatigue can all indicate significant blood loss from somewhere in the digestive tract.
Severe gastrointestinal bleeding can lead to shock, which is a medical emergency. Signs of shock include confusion, a rapid heart rate, pale skin, cold hands and feet, and heavy sweating. If you’re experiencing any of these alongside bloody stool, that warrants emergency care immediately.
For most people, though, red stool turns out to be last night’s beet salad or a minor hemorrhoid flare. If the color goes away after a couple of days and you have no other symptoms, there’s usually nothing to worry about. If it keeps coming back, a simple office visit can sort out what’s going on.