Bleeding That Comes and Goes for Months

Why bleeding that stops is not bleeding that is explained

A gap in the bleeding tells you the bleeding paused. It does not tell you why it started. Those are separate facts, and the first has a way of standing in for the second — you see blood, you brace, nothing happens for three weeks, and the episode quietly gets filed as resolved. Nothing was resolved. It was postponed.

This is the most common way rectal bleeding goes unevaluated for a year, and it is not a failure of seriousness. It is a failure of the evidence available to you. The only thing a gap establishes is that a bleeding surface went undisturbed for a stretch — which is a fact about your stool, not a fact about the surface.

Intermittency is a property of the cause, not evidence against it. The quiet weeks are not a second opinion.

The version clinicians see over and over is a person who has been meaning to call since March. Not someone dismissing it. Someone waiting for it to declare itself. It does not declare itself, and that is the entire problem.

Why intermittent bleeding is exactly what a polyp does

Intermittency is not an odd feature of the causes worth finding. It is their normal behavior. Colon polyps are growths on the lining of the colon or rectum, usually benign, though some can turn cancerous over time 1Ref 1National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (2017).Definition & Facts for Colon Polyps.The definition of colon polyps as growths on the colon or rectal lining that are usually benign, though some can become cancerous over time, and the rationale that removing them can prevent cancer.. A growth sitting in the path of passing stool bleeds when stool abrades it and does not when nothing does. That produces precisely the on-and-off pattern people find reassuring.

The mechanics deserve to be blunt, because they are the argument. A lesion that bleeds does not bleed continuously. It bleeds when something touches it — a hard stool, a large one, a run of diarrhea, a bad week. In between, the surface is left alone and there is nothing to see. The gaps are made of ordinary days, not of healing.

Removing a polyp is what lets a colonoscopy prevent a colorectal cancer rather than only detect one 1Ref 1National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) (2017).Definition & Facts for Colon Polyps.The definition of colon polyps as growths on the colon or rectal lining that are usually benign, though some can become cancerous over time, and the rationale that removing them can prevent cancer.. That is why the intermittent case is worth chasing rather than waiting out. A polyp found during the on-and-off phase is a procedure. The same thing found several years later can be a different conversation.

None of which means every intermittent bleed is a polyp. Painless rectal bleeding has a long list behind it, and cancer is one entry on that list rather than the whole of it. But a list is not a diagnosis. Looking is the only thing that assigns you a place on it.

Why the pattern keeps winning

The on-and-off shape is unusually good at defeating intentions, and it helps to see the mechanism rather than blame yourself for it. Each episode creates alarm. Each gap dissolves it. By the time an appointment would have been made, the reason for making it has faded — and the next episode restarts the cycle from zero instead of adding to a total.

Nothing accumulates, in other words, except the months.

The fix is boring and it works: write it down. A dated log turns six forgettable episodes into one visible pattern, and a pattern is something you can hand to a clinician. It also survives the gaps, which your memory of the alarm does not.

• The date, and roughly how much blood.
• Where it was — in the bowl, on the paper, worked through the stool.
• What the stool was doing that day: hard, loose, normal, urgent.
• Anything else in the same window: pain, weight, appetite, energy.
• What the gaps looked like — fully clear, or only quieter.

That last item earns its place. A change in bowel habits running quietly underneath the bleeding is a separate finding, and it is the one most likely to get lost, because it arrives gradually while the blood arrives dramatically.

What age does to this question

Age changes the odds, and it changes them in a direction people get backwards. The USPSTF recommends colorectal cancer screening for average-risk adults starting at 45 — a grade B recommendation from 45 to 49, and grade A from 50 to 75 2Ref 2U.S. Preventive Services Task Force (USPSTF) (2021).Colorectal Cancer: Screening (Final Recommendation).That recommended average-risk colorectal cancer screening begins at age 45, as a grade B recommendation for ages 45-49 and grade A for ages 50-75.. But that number describes people with no symptoms. Bleeding is a symptom, and symptoms have no age of eligibility.

The distinction gets missed in both directions. Someone of 34 with six months of on-and-off blood decides they are too young for this to be anything, and does not go. Someone of 61 decides their colonoscopy at 55 settled it, and does not go either. Neither conclusion follows from anything.

The younger version has become harder to defend. American Cancer Society statistics report that the share of colorectal cancer diagnosed in adults under 55 roughly doubled, from 11% in 1995 to 20% in 2019, alongside a shift toward more advanced disease at diagnosis 3Ref 3Siegel RL, Wagle NS, Cercek A, Smith RA, Jemal A (2023).Colorectal cancer statistics, 2023.That the share of colorectal cancer diagnosed in adults under 55 roughly doubled from 11% in 1995 to 20% in 2019, alongside a shift toward advanced-stage disease at diagnosis.. By 2019, one in five colorectal cancers was diagnosed in someone under 55 — double the share in 1995 3Ref 3Siegel RL, Wagle NS, Cercek A, Smith RA, Jemal A (2023).Colorectal cancer statistics, 2023.That the share of colorectal cancer diagnosed in adults under 55 roughly doubled from 11% in 1995 to 20% in 2019, alongside a shift toward advanced-stage disease at diagnosis..

So: after 45, bleeding earns a colonoscopy on the strength of the bleeding alone, because the screening age is a floor for people without symptoms rather than a gate for everyone else. Under 45, the case is made by the symptom rather than the birthday. Colorectal cancer red flags are not age-restricted either — blood, a bowel habit that changed and stayed changed, weight coming off without effort, and a family history all count at 30 the way they count at 60.

Why a stool test is the wrong tool once there is visible blood

This is the most consequential mistake in the whole topic. A stool test is a screening instrument. It hunts for blood you cannot see, in a person who has no symptoms at all. If you can already see blood, that question has been answered — and running the test anyway adds a delay plus a number that can only mislead you.

The figures sharpen the point. A meta-analysis of the fecal immunochemical test found pooled sensitivity of about 0.79 and specificity of about 0.94 for colorectal cancer 4Ref 4Lee JK, Liles EG, Bent S, Levin TR, Corley DA (2014).Accuracy of fecal immunochemical tests for colorectal cancer: systematic review and meta-analysis.That FIT has pooled sensitivity of approximately 0.79 and specificity of approximately 0.94 for colorectal cancer, meaning a single test misses roughly one cancer in five.. That is roughly one colorectal cancer in five missed by a single FIT 4Ref 4Lee JK, Liles EG, Bent S, Levin TR, Corley DA (2014).Accuracy of fecal immunochemical tests for colorectal cancer: systematic review and meta-analysis.That FIT has pooled sensitivity of approximately 0.79 and specificity of approximately 0.94 for colorectal cancer, meaning a single test misses roughly one cancer in five.. Repeated on a schedule across a whole population of people without symptoms, that is a sound trade. As a way of deciding whether your visible bleeding deserves a look, it is close to useless, because a negative result does not unsee the blood.

The same reasoning covers the multi-target stool DNA tests. Whatever their accuracy, they were built and validated for people without symptoms — and a symptom takes you out of the population they were designed for.

There is a legitimate version of this worth not confusing with the other. When a screening stool test is positive in someone with no symptoms, colonoscopy is the follow-up, and the American Cancer Society notes that a follow-up colonoscopy after a positive stool test is covered as screening 5Ref 5American Cancer Society (2024).Insurance Coverage for Colorectal Cancer Screening.That the ACA requires private insurers and Medicare to cover USPSTF-recommended colorectal cancer screening with no cost-sharing, that polyp removal during screening colonoscopy is included, that follow-up colonoscopy after a positive stool test is covered as screening, and that Medicaid coverage varies by state.. That is a stool test doing its job. Using one to triage blood you have already seen is not.

A screening test finds what you do not know about. It is not a second opinion on what you already saw.

What the evaluation involves, and what it costs

Working out where the blood comes from means looking at the lining, and the ACG guideline names colonoscopy as the test that does it, normally after a preparation that empties the colon so the view is clear 6Ref 6Sengupta N, Feuerstein JD, Jairath V, Shergill AK, Strate LL, Wong RJ, Wan D (2023).Management of Patients With Acute Lower Gastrointestinal Bleeding: An Updated ACG Guideline.That colonoscopy, typically performed after bowel preparation, is the primary diagnostic test for identifying the source of lower gastrointestinal bleeding.. For intermittent bleeding, the scope is usually arranged as a scheduled procedure rather than an urgent one — which is a comfort, and not a reason to defer it again.

One quirk of the system is worth understanding before you call, because it is a genuine reason people put this off. Under the ACA, private insurers and Medicare must cover USPSTF-recommended colorectal cancer screening with no cost-sharing, and polyp removal during a screening colonoscopy is included 5Ref 5American Cancer Society (2024).Insurance Coverage for Colorectal Cancer Screening.That the ACA requires private insurers and Medicare to cover USPSTF-recommended colorectal cancer screening with no cost-sharing, that polyp removal during screening colonoscopy is included, that follow-up colonoscopy after a positive stool test is covered as screening, and that Medicaid coverage varies by state.. Medicaid coverage varies by state 5Ref 5American Cancer Society (2024).Insurance Coverage for Colorectal Cancer Screening.That the ACA requires private insurers and Medicare to cover USPSTF-recommended colorectal cancer screening with no cost-sharing, that polyp removal during screening colonoscopy is included, that follow-up colonoscopy after a positive stool test is covered as screening, and that Medicaid coverage varies by state..

The catch is that a colonoscopy done because you are bleeding is a diagnostic procedure rather than a screening one, and it can be billed differently. That is worth asking about directly when scheduling rather than discovering afterward. It is a billing question, not a medical one, and it does not change what the bleeding needs.

The rectal bleeding evaluation itself generally starts before the scope, with an examination and blood work. Telling hemorrhoids from something serious is part of what that examination is for — and part of why it cannot be done over the phone.

What the months have and have not told you

Six months of on-and-off blood has produced exactly one piece of information: somewhere there is a surface that bleeds when it is disturbed. That is the whole yield. It does not tell you the surface is benign. It does not tell you it isn't. And the passage of time has added nothing to the file except time.

People expect duration to be diagnostic in one direction or the other — either it has been months, so it must be serious, or it has been months and nothing has happened, so it must be nothing. Neither holds. A long intermittent history is compatible with something that takes five minutes to remove and with something that does not.

The bleeding also does not need to be happening on the day of the appointment. Nobody is trying to catch it in the act; the colon carries the evidence whether or not it is bleeding this week. Blood in stool and cancer are welded together in everyone's mind, and that is precisely why the gaps feel so good and are worth so little.

What the call produces is an appointment and an explanation. Whatever the answer turns out to be, it replaces the version you have been carrying since spring — the one built entirely out of not knowing.

The gap is, in practice, the only time anyone feels calm enough to pick up the phone. That is a reason to use it, rather than to wait for the next episode to make the case all over again.