I have blood in my stool (poo) - Do I have cancer?


How many people who have blood in their stools (poo) have cancer?

There have been two research studies done, looking at thousands of people to work out how many people with a certain symptom are likely to have cancer. If you have blood in your poo or on the toilet paper, then you should make an appointment and mention this to your GP.  The chances are it’s not cancer but you need to let your GP know.  It may be embarrassing to talk about it to your doctor but it won’t take long and it will put your mind at rest.

So just how many people who have blood in their stools have cancer?  Not many!

Cause of blood in stool not known* Blood in stool caused by a disease other than cancer Blood in stool caused by cancer
Percentage of Cases 71 % 26 % 3 %
Actual Number of People studied

(15, 289 in total)

10,855 3,975 459

* At 3 years from first reporting the symptom (diagnoses of cancer were most often made in the first three months after visiting the GP)

This information in the table above can also be shown using a pie chart.


Data from:

Jones et al BMJ “Alarm symptoms in early diagnosis of cancer in primary care cohort study using general practice research database” (May 2007)

Jones et al BMJ “Alarm symptoms and identification of non-cancer diagnoses in primary care: cohort study” (August 2015)

So what does this all mean?

Well, the researchers that carried out this study used something called the “UK General Practice Research Database”. They got their information from 128 GP practices in England (we don’t know which practices they looked at for reasons of confidentiality) and looked at the records from December 2000 to January 1994. They looked at how many people, in those 128 GP surgeries had visited their doctor because they had blood in their stool, they then followed the records for three years to find out what happened to them.

In total they found that 15,289 people went to their doctor because they had blood in their stool, most of these people (about 71 %) never found out the reason why this happened to them. For about a quarter of people (about 26 %), this symptom was caused by a disease other than cancer.  Only a very small number of  people with blood in their stool were  diagnosed with cancer, less than 3 %. Almost all the people diagnosed with cancer, were diagnosed quickly, within the first 3 months of their visit to the doctor.

Apart from cancer, what else causes blood in your stools?

Lots of things, which is why it is important to see your GP. Most people with blood in their stools were found to have haemorrhoids (piles) a few were diagnosed with diverticulitis (swollen pockets in the lower part of your tummy (abdomen)). The older you are, the more likely you are to develop cancer (as your cells have had longer to get damaged) so if you are over 50 and have noticed blood when you go to the toilet, please tell your GP.  There are lots of other reasons for this symptom, far too many to mention here. It is a common problem, from the numbers above you can see that about 120 people visited each GP practice after noticing blood in their stools, so it is not uncommon.

I can’t tell my doctor about this, it’s too embarrassing!

It is embarrassing, but your GP will be used to dealing with this sort of thing. Actually getting in the door and telling your doctor is the worst part. Doctors spend years at medical school learning a whole different language, don’t worry if you don’t know all the correct technical terms, your doctor will be able to figure it out. There are websites that help you say difficult words http://www.howjsay.com is a good one.

  • Urine is the posh (medical) word for pee, piss, widdle, waz or a number one.
  • Stool is the posh (medical) word for poop, pooh, turd, shit or a number two.
  • Passing urine means having a pee/piss/widdle.
  • A bowel movement means having a poo/shit/turd.
  • Diarrhoea means “the runs” or “the skits”
  • Constipation means you can’t poo or you’re “blocked up”.

Even knowing all this, it is still not easy to bring this up with your doctor, below is an example of a conversation you could have with your GP. Practice it at home first and don’t chicken out, say it as soon as you go in, don’t leave it until the end of the appointment!

A sample conversation

GP: Hello, how are you?

You: Fine thanks. (Everyone says this, you wouldn’t be at the doctors if you are fine!)

GP: What can I do for you today?

You: Well, actually, this is quite embarrassing…

GP: Go, on

You: I’ve noticed some red  blood in my poo / on the toilet paper

If you are worried it might be cancer then you are far better to ask this question outright than go away worrying about it.

You: My father/brother/mother/sister/friend had ______________ (type of cancer), I am worried that this might be cancer.

There, that’s the worst bit over and done with.  Your doctor will probably ask you a few questions, so if it helps have a think about them before you go in.

  • Questions your doctor might ask
  • When did it start (last week, last month?)
  • Is it painful?
  • Are you feeling well otherwise?
  • Questions you can ask your doctor
  • Do I need any tests?
  • When should I come back?
  • How do I get my test results? Do I phone?  If so, when should I phone?
  • How long will the results take?
  • Do I need to see a specialist?

What if I don’t think my GP is taking this seriously?

Go back, doctors aren’t mind readers, if it is still a problem, make another appointment. It helps if you can see the same GP again. If you still feel like you are getting nowhere, make an appointment with a different GP and get a second opinion, remember doctors are human too, you might just have caught them on a bad day. The Cancer Research UK website has more information on the NICE guidelines and what you should expect called “Should I see a bowel cancer specialist?” If you still aren’t getting anywhere you could contact the Patient Advice and Liaison Service (PALS) or ask at your GP reception for a comment form.

Remember, when doctors looked at more than 15, 000 people with blood in their stools less than 500 of those people had bowel cancer.

A downloadable copy of this post is available with space to complete the questions and add your own notes. “I have blood in my stool – Do I have cancer“. The file is a pdf, you will need Adobe Acrobat reader to open it.

Related information on this website

Bowel/Colon Cancer – Is it common?

Bowel/Colon cancer in the family – Is it Genetic?


19 comments to I have blood in my stool (poo) – Do I have cancer?

  • [...] I have blood in my stool (poo) – Do I have cancer? [...]

  • [...] I have blood in my poo (stool) – Do I have cancer? [...]

  • i been seeing blood drops from my anus this started couple of months and i thought it meat be something i have eaten anytime i go number 2 i have this pains in my anus..and it stop, now am encountering the same problem but with no pains. what should i do or what meant be the problem.

  • Sarah

    You should go and speak to your doctor, in person. Especially as this has been happening for a couple of months. If you don’t want to talk about it, print out this post and show it to them, or just write it down on a bit of paper. It’s probably not serious, but you NEED to get this checked out by a GP/doctor so you know for sure.

  • Susan Murphy

    I had a poo this evening and I noticed blood on it, and on the tissue, I got worried . Is this serious? this was the 2nd time . About 4 weeks ago, theres a blood on my poo, I thought because I ate beetroot crisps. Please, give me an advice about this . Is this serious? Thank You

  • Sarah

    Please see your doctor, they’ll be able to advise you.

  • Shapla Bella

    Recently i’ve been getting blood in my poo which is turning more serious and now i cant stand or sit and have to run to the loo every half an hour. I went to my GP but all i did was baffled them because they don’t understand if im not constipated or have a cut on my anis then how could i bleed…?

  • Abby Albi

    I have this problem for the last 3 days can you recomand me something?

  • Jordan

    This is the second time this has happened, there will be a little bit of blood on the TP after I shit. It’s weirdd. Idk if its what I’m eating or what but im only 14 and my mom takes a million years to schedule appointments for me.

  • Oscar Stimer

    i have had blood spots in my poo but its only happend twice and it doesnt hurt as such?
    does it mean i just have a small tear that has reopened because the blood is bright red or is it something else?

  • Rocky

    I have blood in my poo Its begin on 22 april I’m worried about this and I’m afraid of cancer and I’m shy to see doctor this is my first time to happen to me no pains in my stomach but I have ulcer ..

  • bridge

    when i went to the toilet a few weeks ago i had tiny drops of blood on the tissue and yesterday i had blood in my poo the same thing happened today and i dont no what to do can you help me?

  • Sarah

    No sorry I can’t help, you need to see your own doctor, its probably nothing but you need to get it checked out.

  • Sarah

    I hope you’ve been to see your doctor, don’t be shy, its what they are there for.

  • Sarah

    This is something you need to discuss with your own doctor, some one who knows your own medical history and who will have an idea if a tear has reopened or what you should do next.

  • Sarah

    I doubt its what you are eating and its very, very, very unlikely to be anything serious if you are 14 (as diseases like colon cancer tend to affect people who are 60 or older), but still worth asking your mum to make an appointment.

  • emzy

    i have a really sharp stabbing under my left rib i have had it for a while but when i poo there’s blood and it kinda bad and there’s something ales but i have no idea what that is… sometimes the sharp pain get really bad and i drop to the floor i don’t what to tell anyone i just say i was really sleepy. what do i do ? help

  • I feel this is among the such a lot important information for me. And i am happy reading your article. But wanna remark on few basic issues, The site style is perfect, the articles is in reality excellent : D. Good job, cheers

  • dan

    hi im 14 years old and i notice last night their was some blood in my crap and im worried about telling my parents because doctors and anything medical frighting me what should i do

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