Blood after a bowel movement has a range of causes, from minor irritation to more serious conditions. What’s more is that serious issues can mimic the less severe ones.
The sight of blood makes many people nervous. When it’s your own blood, and you notice it after a bowel movement, it can be that much more concerning. The first thing to do is not ignore it.
Anal bleeding can have multiple causes, from the benign to more insidious. While an online blog in no way takes the place of seeing your doctor, the following can help you discern what may be happening. If you notice blood, unusual bowel movements, or anything else out of the ordinary, please consult your healthcare practitioner.
What Causes Anal Bleeding?
Not all causes of anal bleeding mean something serious, but none of them should be outright ignored. The location, color, and associated symptoms are all clues, but because those symptoms can overlap, self-diagnosis can be unreliable.
A quick note before we proceed: sometimes, it isn’t even blood, like when you eat beets or items with heavy food coloring. It can be unexpected and alarming, just the same, and you still want to keep an eye on it, just to be sure. All that to say that it’s best to pay attention.
One of the most common and less serious causes of bleeding is hemorrhoids. For many people, they can be more of a nuisance than anything, but sometimes they do require a doctor’s help. These are swollen veins in the rectum or around the anus, and they usually stem from increased pressure in that area – straining, chronic constipation or diarrhea, sitting on the toilet too long, heavy lifting, obesity, and pregnancy are familiar culprits. When hemorrhoids bleed, the blood is bright red and shows up on toilet paper when wiping. They can also cause mild pain, itching, irritation, or feel like a small, spongy lump.
Anal fissures also cause bleeding. These are small tears in the lining of the anus, and because there is an actual break in the skin, the pain felt is sharp and noticeable, especially with bowel movements. Inflammatory bowel disease (like Crohn’s disease), passing hard stools, anal sex, or inserting a suppository too aggressively are common causes. Along with blood, some individuals may also experience lingering itching or burning.
A less common but more serious reason for anal bleeding is anal cancer. In the early stages, the symptoms can be mild, intermittent, and easily overlooked. Bleeding might not be as prolific, itching, irritation, or discomfort may or may not be present, and sometimes a small lump near the anus may be present. Symptoms become more noticeable as the disease progresses. The blood can be either bright or dark, pain can become more significant, and if there are lumps, they will feel firm, not soft. More conspicuous symptoms include unusual discharge, a feeling of fullness or pressure, and more pronounced changes in bowel habits, such as increased frequency, more straining, or narrower stools. Lymph nodes in the groin area may also become swollen.
Easily Mistaken
Sometimes, the symptoms of hemorrhoids, anal fissures, and anal cancer can be difficult to tell apart.
All three conditions involve bleeding from the same general area; when blood shows up on toilet paper, it can be difficult to discern exactly where the bleeding is coming from. And the appearance of blood, alone or in color, does not reliably distinguish between them.
Also confusing, and sometimes difficult to detect, is the presence of lumps. While hemorrhoids manifest as soft, swollen tissue, growths due to anal cancer tend to become firmer. However, without examination, the texture and deeper characteristics are not easy to assess.
Pain patterns that arise in each instance can be blurry, ranging from mild discomfort to sharp pain, although in anal cancer, that might only be mild or sporadic. Early symptoms in all three conditions can fluctuate, making pain an inconsistent distinguishing feature.
Hemorrhoids and fissures often improve with basic care, such as dietary changes, hydration, and reduced straining. They also aren’t associated with swollen lymph nodes. Timing and progression can help distinguish hemorrhoids and fissures from anal cancer, but not always. And cancer isn’t something you want to wait around on. Early anal cancer symptoms might be mild enough to seem temporary, which can create a false sense of reassurance. If you cannot pinpoint a reason for seeing blood in your stool or after a bowel movement, it’s better to get the opinion of a medical professional than wait it out.
When to See a Health Practitioner
As previously mentioned, hemorrhoids and anal fissures can resolve with minimal medical intervention and a change in lifestyle habits. Sitz baths and over-the-counter topical treatments help reduce irritation and discomfort, and symptoms gradually settle as pressure in the area decreases.
There are, however, clear moments when home remedies are not appropriate. One is persistent or recurring bleeding. If it keeps happening, even if it’s mild, it should be evaluated. The same applies if home care isn’t making a difference or if the symptoms come back. Worsening or unchanging pain, especially when it’s severe or not clearly linked to bowel movements, also warrants medical intervention.
Mucus in the stool is also an abnormal feature, as is swelling in the groin or pelvic region. It’s safer to seek medical evaluation rather than assume a benign cause. If anything feels uncertain, have it checked. Why delay something that can be risky?
In individuals struggling with obesity, there is a broader health context to consider. Increased adiposity (particularly visceral abdominal fat) has been associated in medical research with a higher risk of several cancers due to metabolic stress, chronic low-grade inflammation, and hormonal changes that can affect how cells grow and repair.1 Body weight may not explain or predict specific symptoms like anal bleeding, but it does reinforce the importance of taking persistent or unexplained symptoms seriously.
For patients with higher BMI, medical weight management or bariatric surgery are sometimes part of long-term risk-reduction strategies. In many cases, significant weight loss can improve metabolic and inflammatory markers that are associated with various forms of cancer.
SAMPA is a regional leader in laparoscopic and robotic general and weight loss surgery. For more information on weight loss strategies, register for our Weight Loss Surgery Seminar or contact our team.
Resouce:
- Mohamed, A. A., Risse, K., Stock, J., Heinzel, A., Mottaghy, F. M., Bruners, P., & Eble, M. J. (2022). Body Composition as a Predictor of the Survival in Anal Cancer. Cancers, 14(18), 4521. https://doi.org/10.3390/cancers14184521.
