
Quali sono i primi segnali di avvertimento del cancro al colon?
Revisione paritaria di Dr Colin Tidy, MRCGPUltimo aggiornamento di Lynn StephenUltimo aggiornamento 27 Nov 2025
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È facile ignorare un cambiamento nelle abitudini intestinali o sottovalutare mal di stomaco e gonfiore come problemi alimentari. Tuttavia, se questi problemi persistono e sono inspiegabili, potrebbero essere segnali di cancro al colon - e riconoscerli precocemente è molto importante.
In questo articolo:
Video picks for Cancro intestinale
Cancro intestinale - also called colorectal cancer - affects your large bowel, which is made up of the colon and rectum. Around 44,000 people are diagnosed with bowel cancer every year in the UK.
Although more than 9 out of 10 new cases are diagnosed in people over the age of 50, bowel cancer can affect anyone of any age. More than 17,000 people die from bowel cancer in the UK every year, but it can be treatable and possibly curable - especially if it's diagnosed early.
Genevieve Edwards, chief executive at Bowel Cancer UK, says: "Bowel cancer is the UK’s fourth most common cancer but it doesn’t have to be this way. It’s treatable if diagnosed early and by going straight to your doctor it’s possible to rule out bowel cancer first and fast."
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Signs of bowel cancer
Changes in your poo
Symptoms of bowel cancer may include changes in your poo. Your poo may be softer or you may have diarrhoea or constipation that is not usual for you. You may need to poo more or less often than usual, or have blood in your poo - which may look red or black. Additionally, you might often feel like you need to poo, even if you've just been to the toilet.
The key symptoms to look out for include:
Bleeding from your bottom.
Sangue nelle feci.
A persistent and unexplained change in how often you poo, or in your normal urge to do so.
Unexplained perdita di peso.
Extreme stanchezza for no obvious reason.
A pain or lump in your tummy.
Edwards says: "Most people with these don’t have bowel cancer, but if you experience one or more of them, you should visit your doctor straight away. They may ask you to do a test at home to help decide whether your symptoms need further investigation."
Tummy pain and bloating
Tummy aches and gonfiore are common and can be linked to a number of health issues, from your diet to stress. However, if these issues continue for weeks, they may be an early sign of bowel cancer and you should see your doctor.
In women, persistent and continuous bloating can also be a sign of ovarian cancer, so it's important to see your doctor.
Losing weight without trying
Perdere peso, losing your appetito or feeling weak - without any obvious explanation as to why - can be possible signs of bowel cancer, along with many other unrelated conditions. You may also feel very tired for no reason.
If you have any of these symptoms for three weeks or more, you should speak to your doctor.
Bowel cancer in under-50s
Although bowel cancer is more common in people over 50, it's important that everyone is aware of the symptoms.
Researchers at the Washington University School of Medicine in St Louis studied more than 5,000 patients under the age of 50 with bowel cancer. Their symptoms before diagnosis included abdominal pain, bleeding from the bottom, diarrea, and iron deficiency anemia.
Yin Cao, a senior investigator for the study, said: "Bowel cancer is not simply a disease affecting older people. Younger adults need to be aware of and act on these potentially very telling signs and symptoms - particularly because people under 50 are considered to be at low risk, and they don’t receive routine bowel cancer screening."
What to expect when you speak to your doctor
Torna ai contenutiWhen you see your doctor, they will ask you about your symptoms, your health in general, and your medical history. They may also ask if anyone in your family has had bowel cancer. Your doctor may feel your stomach or ask to do a rectal examination, where they put a gloved finger inside your bottom to check for lumps.
You can ask for a male or female doctor or nurse if you feel more comfortable. You may also be asked for a poo (stool) sample for testing.
Your doctor may refer you for more tests or to see a specialist in hospital if they think you have symptoms that need to be investigated, but this doesn’t mean you have cancer.
Speak to your doctor if you're ever concerned about your health or any changes to your body or toilet habits.
Patient picks for Cancro intestinale

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Modi per aiutare a ridurre il rischio di cancro al colon
There are around 46,600 new bowel cancer cases in the UK every year - that's around 130 people every day. Bowel cancer is the 4th most common cancer in the UK, accounting for 12% of all new cancer cases according to Cancer Research UK. However, whilst the overall rates of bowel cancer are falling, the number of under 50s who have the condition is increasing. No matter your age, there are many things you can do to help reduce your chance of getting bowel cancer. Here, gastroenterologist and colon cancer specialist Dr Monique van Leerdam shares her advice.
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How do we screen for bowel cancer?
In the wake of Dame Deborah James's death, Dr Kevin Monahan and Dr Lisa Wilde talk about faecal immunochemical testing - checking for blood in your poo - and other types of bowel cancer screening. This includes Lynch syndrome, a hereditary condition increasing the risk of certain types of cancer including bowel cancer.
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About the author

Lydia Smith
Scrittore di articoli
BA, MA, MSc
Lydia Smith è una giornalista pluripremiata e scrittrice di articoli che ha scritto ampiamente sulla salute delle donne e sulla salute mentale. Attualmente sta studiando per un MSc in psicologia.
About the reviewerView full bio

Dr Colin Tidy, MRCGP
Medico di base, Autore medico
MBBS, MRCGP, MRCP (Paediatrics), DCH
Dr Colin Tidy is an NHS Doctor, based in Oxfordshire.
Storia dell'articolo
Le informazioni su questa pagina sono revisionate da clinici qualificati.
Prossima revisione prevista: 27 Nov 2028
27 Nov 2025 | Ultima versione
25 maggio 2023 | Pubblicato originariamente
Autore:
Lydia Smith

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