3 Colon Cancer Symptoms & When to See Your Doctor, According to an Oncologist

The American Cancer Society estimates that approximately 107,320 people will be diagnosed with colon cancer for the first time this year. And while colon cancer rates overall have dropped over the decades, early-onset cancer rates are on the rise; colon cancer rates are up 2.4% per year for those younger than 50. 

That’s why for Colorectal Cancer Awareness Month, it’s important to know your risk, common symptoms and when to see your doctor. We asked Fox Chase Cancer Center oncologist and gastrointestinal specialist Christopher G. Cann, M.D., for his insights.

“It’s imperative for young adults to focus on improving physical activity, maintaining a healthy weight and, most importantly, listening to their bodies when symptoms arise,” he says. Here are the signs that all adults should keep in mind.

Symptoms of Colon Cancer

There are three key symptoms of colon cancer you should know, according to Cann. And while some have a more obvious connection to colon cancer than others, all of these symptoms are easy to leave unnoticed. If any of these symptoms describe your health concerns, talk to your doctor.

Abdominal Pain

While occasional stomach pain and cramps can be a normal reaction to food or targeted activity, constant abdominal pain can be a sign of a chronic condition. This can include colon cancer, so it’s important to not write off this symptom if your pain continues or worsens.

Fatigue

Fatigue alone is not a clear sign of colon cancer (or any cancer, for that matter), but it can be a factor if it feels unexplained or if it’s paired with other symptoms. If you feel like you’re always tired, reasons can include lack of sleep, stress, dehydration or nutritional imbalances. But talk to your doctor if your tiredness or weakness is consistent and you’re unsure why.

Bloody Stool

Blood in your stool is a red flag, and it shouldn’t be overlooked. Rectal bleeding is a sign of colon cancer, and it may make your stool look dark brown or black. And a change in bowel habits is crucial to note to your doctor, as long-term diarrhea or constipation are also common indicators of colon cancer.

When Should You Talk to Your Doctor?

For signs that feel a bit private, especially when related to bowel movements, it may feel uncomfortable to pay a visit to the doctor. But if you are experiencing any symptoms, the oncologist urges you to contact your health care provider as soon as possible.

“Please discuss your symptoms with your doctor,” Cann emphasizes. “Cancers in young adults are often diagnosed at later stages, making them harder to treat. Therefore, early detection is key to improving survival.”

And even if you only have one symptom, or if none of the above symptoms fully apply but you don’t feel quite right, it is best and safest to talk to your doctor for the most personalized health evaluation and advice.

“If you are concerned about a symptom, no matter how small it may seem, please seek evaluation,” the oncologist says.

The Bottom Line

According to oncologist Christopher G. Cann, M.D., the top three colon cancer symptoms to note are abdominal pain, chronic fatigue and bloody stool. If you are experiencing any of these signs, it’s vital that you talk to your doctor immediately. As the oncologist puts it, “trust your body”—a checkup with your health care provider is never a wrong decision if you’re feeling out of sync.