Help us to stop bowel cancer

Symptoms of bowel cancer

Bowel cancer is very treatable but the earlier it is diagnosed, the easier it is to treat. People whose cancer is diagnosed at an early stage have a much higher chance of successful treatment than those whose cancer has become more widespread.

If you have any symptoms, don’t be embarrassed and don’t ignore them. Doctors are used to seeing lots of people with bowel problems.

The symptoms of bowel cancer can include:

  • Bleeding from your bottom and/or blood in your poo
  • A change in bowel habit lasting three weeks or more
  • Unexplained weight loss
  • Extreme tiredness for no obvious reason
  • A pain or lump in your tummy

Most people with these symptoms don’t have bowel cancer. Other health problems can cause similar symptoms. But if you have one or more of these, or if things just don’t feel right, go to see your GP

Our symptom diary can help you explain your symptoms to your GP. You can either print this or save it to your desktop and fill in.

Sometimes, a tumour can block the bowel, causing sudden strong pains in the stomach area, bloating and feeling or being sick. You may also be unable to empty your bowels or pass wind. If you think you have a blocked bowel, see your GP straight away or go to a hospital accident and emergency department.


There are several possible causes of bleeding from your bottom or blood in your bowel movements (poo). Bright red blood may come from swollen blood vessels (haemorrhoids or piles) in your back passage. Dark red or black blood may come from your bowel or stomach. Tell your doctor about any bleeding so they can find out what is causing it.

Change in bowel habit

Tell your GP if you have noticed any changes in your bowel habit that have lasted three weeks or more, especially if you also have bleeding from your back passage. You may have looser poo and you may need to poo more often than normal. Or you may feel as though you’re not going to the toilet often enough or you might not feel as though you’re not fully emptying your bowels.

Weight loss

This is less common than some of the other symptoms. Speak to your GP if you have lost weight and you don’t know why. You may not feel like eating if you feel sick, bloated or if you just don’t feel hungry.


Bowel cancer may lead to a lack of iron in the body, which can cause anaemia (lack of red blood cells). If you have anaemia, you are likely to feel very tired and your skin may look pale.

Pain or lump

You may have pain or a lump in your stomach area (abdomen) or back passage. See your GP if these symptoms don’t go away or if they’re affecting how you sleep or eat.

More information

Read our information on diagnosing bowel cancer.

You can find a list of symptoms in our booklet, Simple steps for good bowel health, and our pocket-sized leaflet, Facts about bowel cancer.


Updated March 2016. Due for review March 2018