Seeing blood in stool can be unsettling. It may appear as bright red blood on toilet paper, red streaks on the stool, blood mixed into the stool, maroon-colored stool, or black, tarry stool. Sometimes the cause is less serious, such as hemorrhoids or a small anal fissure. Other times, blood in stool can point to inflammation, infection, ulcers, diverticular bleeding, inflammatory bowel disease, or another condition that needs medical care.
The important thing is not to panic, but also not to ignore it. Blood in stool is a symptom that deserves attention, especially if it is new, repeated, heavy, unexplained, or linked with pain, dizziness, weakness, fever, diarrhea, weight loss, or black stool.
What Does Blood in Stool Mean?
Blood in stool means there is bleeding somewhere in the digestive tract. The source may be near the anus, such as hemorrhoids or a tear in the skin, or it may come from higher up in the colon, small intestine, stomach, or upper digestive tract.
The color and appearance of the blood may give clues, but it cannot confirm the cause by itself. Bright red blood often suggests bleeding closer to the rectum or anus, while darker red, maroon, or black stool may suggest bleeding from higher up in the digestive tract. However, there are exceptions, so it is safest to use stool appearance as a clue, not a diagnosis.
If your stool is black and tar-like rather than red, you may also want to read this guide on black stool and when it may be a red flag.
What Blood in Stool Can Look Like
Blood in stool does not always look the same. Paying attention to the pattern can help you explain it more clearly to a healthcare professional.
| How it looks | What it may suggest | What to do |
|---|---|---|
| Bright red blood on toilet paper | May come from the anus or rectum, such as hemorrhoids or fissures | Seek advice if it repeats, is painful, or has no clear cause |
| Red streaks on stool | May happen with minor rectal bleeding, constipation, or irritation | Monitor closely and contact a clinician if it continues |
| Blood mixed into stool | May suggest bleeding higher in the colon | Medical evaluation is recommended |
| Maroon or dark red stool | May come from deeper in the digestive tract | Seek medical advice promptly |
| Black, tarry, sticky stool | May suggest upper digestive tract bleeding | Seek medical care promptly |
Common Causes of Blood in Stool
There are many possible reasons for blood in stool. Some are common and treatable, while others require urgent evaluation. The goal is not to self-diagnose, but to understand why this symptom should be taken seriously.
1. Hemorrhoids
Hemorrhoids are swollen veins around the rectum or anus. They can sometimes bleed, especially after straining, constipation, sitting on the toilet for a long time, or passing hard stool.
Bleeding from hemorrhoids is often bright red and may appear on toilet paper, in the toilet bowl, or on the outside of the stool. Even if hemorrhoids seem likely, it is still worth speaking with a healthcare professional if bleeding is new, frequent, heavy, or different from your usual pattern.
2. Anal Fissures
An anal fissure is a small tear in the skin around the anus. It may happen after passing hard stool or during constipation. Fissures can cause sharp pain during bowel movements and small amounts of bright red blood.
If constipation is part of the pattern, you may find this guide helpful: Constipation: Causes, Symptoms & Natural Relief Guide. Still, blood in stool should not be brushed off as “just constipation” if it keeps happening or comes with other symptoms.
3. Constipation and Straining
Constipation can make stool harder and more difficult to pass. Straining may irritate hemorrhoids or contribute to small tears near the anus. This can sometimes lead to bright red blood.
For everyday constipation patterns, gentle food changes, hydration, and fiber may help some people. But if blood is present, especially repeatedly, it is safer to get medical advice rather than only focusing on home care.
4. Diarrhea, Infection, or Inflammation
Blood in stool can sometimes appear with diarrhea caused by infection, inflammation, or irritation in the intestines. This may happen alongside cramps, fever, urgency, nausea, or dehydration.
If you have diarrhea with blood, fever, severe pain, or signs of dehydration, seek medical care. For related reading, see diarrhea after eating and what to eat when you have diarrhea.
5. Inflammatory Bowel Disease
Inflammatory bowel disease, or IBD, includes Crohn’s disease and ulcerative colitis. These conditions can cause inflammation in the digestive tract and may lead to blood in stool, diarrhea, abdominal pain, fatigue, weight loss, or recurring flare-ups.
IBD is different from IBS. IBS can cause uncomfortable bowel symptoms, but it does not usually cause visible blood in stool. If you are unsure about the difference, read IBS vs IBD: What’s the Difference?
6. Diverticular Bleeding
Diverticula are small pouches that can form in the colon. Sometimes, they can bleed. Diverticular bleeding may cause sudden blood in the stool and can sometimes be heavy.
Because the amount of bleeding can vary, sudden or significant blood in stool should be checked by a healthcare professional.
7. Polyps or Colorectal Cancer
Blood in stool can sometimes be linked with colon polyps or colorectal cancer. This does not mean blood automatically means cancer, but it is one reason the symptom should not be ignored, especially if it is persistent or appears with other changes.
Warning patterns may include ongoing bleeding, a change in bowel habits, unexplained weight loss, fatigue, anemia, narrower stools, or abdominal discomfort. Adults should also follow age-appropriate colorectal cancer screening guidance from their healthcare professional.
8. Upper Digestive Tract Bleeding
Blood from higher up in the digestive tract may not look bright red. It may appear as black, tarry stool because the blood changes as it moves through digestion.
Possible upper digestive causes may include ulcers, severe stomach irritation, esophageal bleeding, or other conditions. Black, tarry stool, vomiting blood, or vomit that looks like coffee grounds should be treated as urgent warning signs.
When Blood in Stool May Be Less Serious
Sometimes, a small amount of bright red blood after passing hard stool may be related to irritation, hemorrhoids, or a fissure. This is especially possible when the blood is only on toilet paper and there is obvious constipation or anal discomfort.
Even then, “less serious” does not mean “ignore it.” If the bleeding is new, keeps returning, increases, happens without constipation, or appears with other symptoms, it is worth getting checked.
When to Seek Medical Help
You should seek medical advice for blood in stool, especially if it is new, repeated, unexplained, or not clearly linked to a minor temporary issue.
Seek medical care promptly if you notice:
- A large amount of blood
- Blood mixed into the stool
- Maroon, dark red, or black stool
- Black, tarry, sticky, or foul-smelling stool
- Dizziness, fainting, weakness, or rapid heartbeat
- Severe or worsening abdominal pain
- Vomiting blood or vomit that looks like coffee grounds
- Fever, ongoing diarrhea, or dehydration
- Unexplained weight loss
- Fatigue or symptoms of anemia
- Blood in stool that keeps coming back
- New bowel habit changes, especially in older adults
Blood in stool is also more concerning if you take blood thinners, aspirin, frequent NSAID pain relievers, or if you have a history of ulcers, IBD, colon polyps, colorectal cancer, liver disease, or previous gastrointestinal bleeding.
What Not to Do If You See Blood in Stool
It can be tempting to treat blood in stool as a simple gut problem, but this symptom is different from occasional bloating or gas. It needs a more careful approach.
- Do not rely on supplements, teas, probiotics, or fiber as the main solution when blood is present.
- Do not assume it is only hemorrhoids unless a healthcare professional has evaluated the pattern.
- Do not ignore repeated bleeding even if the amount seems small.
- Do not stop prescribed medication such as blood thinners without medical advice.
- Do not delay care if the bleeding is heavy or comes with weakness, dizziness, fainting, or severe pain.
Information to Track Before Calling a Doctor
If you speak with a healthcare professional, it helps to describe what you noticed clearly. You do not need to know the cause. Just explain the pattern.
- When the bleeding started
- Whether it happened once or repeatedly
- Whether the blood was bright red, dark red, maroon, or black
- Whether the blood was on toilet paper, on the stool, mixed in, or in the toilet bowl
- Any constipation, diarrhea, straining, or pain
- Any fever, nausea, vomiting, dizziness, weakness, or weight loss
- Any recent medication use, especially blood thinners, aspirin, NSAIDs, or iron
- Any personal or family history of colon polyps, colorectal cancer, IBD, ulcers, or GI bleeding
If your stool changes come with mucus, urgency, cramps, or IBS-like symptoms, this guide on mucus in stool may help you understand related patterns. For a broader overview of symptom warning signs, read Gut Health Red Flags: When Digestive Symptoms Are NOT “Normal”.
How Doctors May Evaluate Blood in Stool
A healthcare professional may ask about your symptoms, stool appearance, bowel habits, medications, medical history, and family history. Depending on the situation, they may suggest tests such as a stool test, blood test, physical exam, colonoscopy, upper endoscopy, or imaging.
The type of evaluation depends on your age, symptoms, bleeding pattern, risk factors, and whether the bleeding appears mild, persistent, or urgent.
Can Food Make Stool Look Red?
Yes, some foods can make stool or toilet water look red or dark. Beets, red food coloring, tomato-heavy foods, and some brightly colored drinks may change stool color temporarily.
However, it can be difficult to tell food coloring from actual blood. If you are not sure, or if the color change repeats, it is safer to ask a healthcare professional.
Final Takeaway
Blood in stool can come from common issues such as hemorrhoids, fissures, constipation, infection, or inflammation. It can also be linked with more serious digestive conditions, including IBD, ulcers, diverticular bleeding, polyps, or colorectal cancer.
The safest approach is simple: do not panic, but do not ignore it. If blood in stool is new, repeated, heavy, unexplained, mixed into the stool, dark red, maroon, black, or comes with pain, weakness, dizziness, fever, diarrhea, vomiting, or weight loss, seek medical help promptly.