A diagnostic test is generally performed because someone has symptoms or a concerning medical finding.
Screening is performed in people who may not have symptoms, with the goal of detecting cancer or precancerous changes early.
For example, colorectal screening may identify polyps that can be removed before they develop into cancer.
In the United States, the CDC recommends colorectal cancer screening beginning at age 45 for average-risk adults.
Screening recommendations can vary by country, age, personal risk, and family history, so people should follow the guidance applicable to them.
If you are younger than the usual screening age but have concerning symptoms or significant risk factors, don’t assume that you are “too young” to need medical attention.
Who May Have a Higher Risk?
Several factors can increase the risk of colorectal cancer.
These can include increasing age, a family history of colorectal cancer, certain inherited genetic conditions, previous polyps, and inflammatory bowel diseases such as Crohn’s disease or ulcerative colitis.
Lifestyle factors can also influence risk. Smoking, excess body weight, physical inactivity, alcohol consumption, and dietary patterns are among factors associated with colorectal cancer risk.
The NHS lists older age, smoking, being overweight, having a close relative with bowel cancer, inflammatory bowel disease, and previous bowel polyps among factors associated with increased risk.
Having a risk factor does not mean you will develop cancer.
Likewise, not having any known risk factors does not guarantee that you cannot develop it.
Family History Matters
Tell your healthcare professional if a parent, sibling, child, or other close relative has had colorectal cancer or certain types of polyps.
Family history can affect when screening should begin and whether additional evaluation or genetic counseling may be appropriate.
A person with a strong family history may need a different screening strategy from someone at average risk.
This is why providing an accurate family medical history can be valuable during routine healthcare visits.
Don’t Ignore Symptoms Because You Are Young
Colon cancer is often associated with older adults, but younger people can also develop colorectal cancer.
Age should therefore not be used as the only reason to dismiss symptoms.
If you are young and experience persistent rectal bleeding, unexplained weight loss, significant changes in bowel habits, ongoing abdominal symptoms, or unexplained anemia, talk to a healthcare professional.
The appropriate evaluation depends on your individual symptoms and circumstances.
When Symptoms Require Urgent Attention
Most bowel symptoms are not emergencies, but some situations require urgent medical attention.
Seek urgent medical care for severe or rapidly worsening abdominal pain, heavy or persistent bleeding, fainting or severe dizziness associated with bleeding, repeated vomiting, or symptoms suggesting a bowel obstruction such as severe abdominal swelling accompanied by inability to pass stool or gas.
A bowel obstruction can be a serious medical condition and requires prompt assessment. NHS hospital guidance specifically notes that suspected bowel obstruction should be assessed urgently.
If you are experiencing a medical emergency, contact your local emergency service or go to the nearest emergency department.
What You Can Do Today
If you recognize several symptoms described in this article, don’t immediately assume the worst.
Instead, take practical steps.
First, write down what you have noticed. Record when the symptoms started, how frequently they occur, and whether they are getting better or worse.
Next, make an appointment with a healthcare professional if the symptoms are persistent, unexplained, or concerning.
Bring information about your medications, previous medical conditions, family history, and any recent changes in your health.
If your doctor recommends testing, follow through with it. A test can provide information that symptoms alone cannot.
Most importantly, avoid self-diagnosing based on internet searches.
Search engines and symptom lists can help you recognize when something deserves attention, but they cannot determine the cause of your symptoms.
The Bottom Line
You may need to talk to a healthcare professional if you notice:
Blood in or on your stool
A persistent change in bowel habits
Ongoing constipation or diarrhea
Stools that consistently look different from normal
A feeling that your bowel does not completely empty
Persistent abdominal pain or cramping
Unexplained bloating or fullness
Unintentional weight loss
Persistent fatigue or weakness
Symptoms of unexplained anemia
Loss of appetite
A new abdominal or rectal lump
These symptoms can occur with colon cancer, but they can also be caused by many other conditions.
The most important message is simple: don’t panic, but don’t ignore persistent changes either.
Colon cancer cannot be diagnosed from symptoms alone. Proper medical evaluation is the only way to determine what is causing concerning symptoms.
And even if you feel perfectly healthy, staying up to date with colorectal cancer screening appropriate for your age and personal risk can be an important part of preventive healthcare.
Early attention can make a difference. If something about your digestion or bowel habits has changed and the change doesn’t seem normal for you, speaking with a healthcare professional is a sensible next step.
Medical Disclaimer
This article is intended for general educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Symptoms described here can have many different causes, and having one or more of them does not mean that you have colon cancer. If you have persistent, worsening, or concerning symptoms, consult a qualified healthcare professional. For severe bleeding, severe abdominal pain, fainting, or other emergency symptoms, seek urgent medical care.
