Rectal bleeding
Blood on the toilet paper, red streaks on your stool, pink water in the pan, black stool — these are all versions of one thing: blood reaching the bowel or…
On this page
- What you may have noticed
- Why "it's just piles" is a dangerous conclusion
- What the colour of the blood tells you, and how it mixes with the stool
- Other causes worth knowing about
- When to call an ambulance, and when to be seen the same day
- What happens at the appointment
- Bowel screening: the point of it when nothing hurts
- Online consultation
Medicines commonly prescribed for Rectal bleeding
For informational purposes only. Always consult a doctor before taking any medication.
Dosage form: RECTAL SEMISOLID, 5 mg/g + 5 mg/gActive substance: hydrocortisoneManufacturer: Laboratorio Reig Jofre, S.A.Prescription not requiredDosage form: SUPPOSITORY, 10 mg bisacodylActive substance: bisacodylManufacturer: Opella Healthcare Spain S.L.Prescription not requiredDosage form: TABLET, 5.00 mg of bisacodyl per tabletActive substance: bisacodylManufacturer: Roha Arzneimittel GmbhPrescription not required
Blood on the toilet paper, red streaks on your stool, pink water in the pan, black stool — these are all versions of one thing: blood reaching the bowel or leaving through the back passage. The commonest cause is harmless, piles or a small tear. But there is an awkward feature of this symptom worth knowing straight away: the appearance of the blood cannot tell a harmless cause from a dangerous one, and "it's only piles" is the single commonest reason bowel cancer gets found late. There is no cause for fright, and none for premature reassurance either. There is only one right move: get it looked at.
What you may have noticed
Rectal bleeding looks very different from case to case, and people do not always recognise what they are seeing:
- bright red marks on the toilet paper;
- red streaks or drops on the outside of the stool;
- pink or red water in the pan;
- blood mixed through the stool, so that it looks evenly dark or maroon;
- mucus streaked with blood;
- loose stool with blood in it;
- black, sticky, glossy stool with a powerful smell.
Before worrying, think back over what you have eaten and what you are taking. Beetroot, tomatoes, tomato juice, red jelly and drinks with colourings turn both stool and urine red. Iron tablets, bismuth, activated charcoal, blueberries and liquorice make stool dark or black. There is a difference, though: food-related black stool looks and smells ordinary, whereas stool containing blood from higher up is sticky, tarry and foul in a way that is hard to mistake. If you are unsure, treat it as blood and get seen — that is the safer direction to be wrong in.
Why "it's just piles" is a dangerous conclusion
An enormous number of adults have piles, and piles genuinely do bleed. The trouble is that having them rules nothing out: piles and a tumour coexist quite happily in the same bowel, and the blood may be coming from the second rather than the first. Nor can a doctor who finds piles on examination stop there if anything else in the picture fails to add up.
The typical story runs like this. Someone in their mid-forties notices blood, remembers that their father had piles, buys suppositories, watches the bleeding settle, sees it come back, and eighteen months pass. In that time a tumour that could have been removed by a straightforward operation has had room to grow. Most late diagnoses come from exactly this delay, not from rare aggressive disease.
Hence a simple rule: bleeding from the back passage is not a diagnosis but a symptom, and every first episode should be examined by a doctor. That does not mean you have cancer — in the overwhelming majority of cases you will not. It means an appointment costs twenty minutes and buys years of certainty. Separately: if your piles are already confirmed but the blood has changed — darker, heavier, appearing alongside a different bowel pattern — that is a reason to be seen again.
What the colour of the blood tells you, and how it mixes with the stool
These features do not give a diagnosis, but they point to where the blood is coming from and how urgent it is.
- Bright red blood on the paper and on the surface of the stool, with pain and stinging when you go. Usually an anal fissure or piles. A fissure tends to follow constipation and hard stool; the pain is sharp, like a cut, and lingers for a while afterwards. Piles are more likely to itch, to feel like a lump, to be uncomfortable, and they do not always hurt.
- Blood mixed all through the stool. That means it joined the bowel contents higher up and travelled the whole way with them. It is more worrying than bright red blood on the paper and calls for the bowel to be examined.
- Blood with mucus, diarrhoea, pain and cramping. This is how inflammatory bowel disease shows itself — ulcerative colitis and Crohn's disease. It often starts in young adults, runs for weeks, and comes with a constant urge to go, night-time trips to the toilet, exhaustion, sometimes fever and joint pain.
- Black, tarry stool. Blood that has passed through the whole bowel and been altered on the way, which means the source is high up: the stomach, the duodenum, the oesophagus. An ulcer, inflammation and, less often, varices in the oesophagus lie behind it. This is urgent regardless of how well you feel.
- Heavy dark red blood with clots and no pain. This is the usual behaviour of diverticula in the colon and of abnormal blood vessels in the bowel wall. Such bleeding may stop by itself, but the volume can be considerable.
- Blood after anal sex, along with discharge, sores or warts. There may be an injury or a sexually transmitted infection; this needs checking too.
Other causes worth knowing about
Bowel polyps bleed as well — benign overgrowths of the lining, a proportion of which turn cancerous over the years. That is why they are removed as soon as they are found: a polyp taken out is a tumour prevented. Bleeding also occurs with bowel infections that cause bloody diarrhoea, with a lining damaged by radiotherapy to the pelvis, with prolapse of the rectum and with an anal fistula.
Medicines that reduce clotting are a case of their own: anticoagulants and antiplatelet drugs, low-dose aspirin included. They do make bleeding more likely and more visible, but they generally do not create it out of nothing — they expose something that was already there. Blaming the tablets and leaving it at that is not safe: the same investigation is needed, and stopping such a medicine on your own initiative is dangerous. Doctor first, decision afterwards.
When to call an ambulance, and when to be seen the same day
Call an ambulance (in Spain, Italy, Portugal, Poland and Ukraine the single number is 112) if:
- the bleeding is heavy and will not stop, the water in the pan turns red, or large clots are coming away;
- you feel weak, dizzy, look pale, break into a cold sweat, your heart races, your vision greys out or you faint — these are signs of significant blood loss;
- you are vomiting blood, or vomit that looks like ground coffee;
- the bleeding comes with severe tummy pain, a swollen abdomen that hurts to touch, or a high temperature;
- your stool is black and tarry — even if you feel perfectly well so far.
Do not drive yourself. Ask someone to take you or call an ambulance, and bring a list of the medicines you take, particularly anything that thins the blood.
See a doctor the same day or within the next few days if:
- this is the first time in your life you have seen blood and you are no longer in your twenties — the likelihood of a serious cause rises with age, and the threshold for investigating falls;
- the blood keeps coming back, or has been there for more than two or three weeks;
- your usual bowel pattern has changed and stayed changed for more than a few weeks: looser, thinner, more frequent stool, or stubborn constipation instead;
- you are losing weight for no clear reason, tiring quickly or getting short of breath on your usual effort — that is how anaemia from slow, unnoticed blood loss shows itself;
- there is pain or a lump you can feel in your abdomen, or a sense of not emptying properly;
- bowel cancer, polyps or inflammatory bowel disease run in your family;
- a child has blood in their stool — at any age and in any quantity.
What happens at the appointment
It starts with questions that feel awkward but decide everything that follows: what the blood looks like, how much there is, whether it comes with pain, what your bowels are doing, what you take, what has happened in your family. Work the answers out beforehand and do not tidy them up — a doctor hears this several times a day.
Then comes a look at the anal area and a rectal examination with a gloved finger. It takes under a minute, is uncomfortable more in the mind than in the body, and finds a fissure, piles and a proportion of rectal tumours in the consulting room itself. Sometimes a proctoscopy is added — a brief look through a small instrument.
Blood tests are usual, to show anaemia and iron stores, along with a stool test for hidden blood. The main investigation, though, is colonoscopy: a view of the colon from the inside, during which the source can not only be seen but a polyp removed or a sample taken there and then. It is done with pain relief or under sedation, and the harder part is generally the bowel preparation the day before rather than the test itself. If the source is suspected to be higher up, a gastroscopy is arranged.
Bowel screening: the point of it when nothing hurts
Bowel cancer develops slowly, over years, usually out of a polyp, and in its early stages produces no sensation whatsoever. Found early, it is curable in most people; found late, treatment is hard and not always successful. Screening exists to work inside that gap: to catch the change before there are any complaints to report.
Every country this site serves runs a screening programme, and they are built along similar lines. From a certain age, people without symptoms are offered a stool test for hidden blood at regular intervals, and a colonoscopy if it comes back positive. The starting age and the interval differ from country to country, so follow your national programme rather than figures found online. Anyone with a close relative who had bowel cancer or polyps usually starts earlier and repeats more often.
One important caveat: screening is designed for people without symptoms. If blood is already there, do not wait for the next letter from the programme, and do not let a negative home test settle the matter. Get seen.
Online consultation
An online doctor can help you judge how fast you need to move: going through what the blood looks like and what your bowels are doing, and weighing the risk against your age, family history and medication. They will say what can be done at home for a fissure or constipation and what cannot wait, explain which investigation you are most likely to be offered and how to prepare for it, and read through blood results and a colonoscopy report you already have. And they will tell you honestly when watching is enough and when the appointment needs to be today.
This material is for information only and does not replace medical advice.
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