Knowing the Difference Between Symptoms of IBS and Colon Cancer

April 21, 2026
Know the difference
IBS or Colon Cancer?
They can look alike at first. Catching the difference early can save your life.

Knowing the difference between symptoms of IBS and colon cancer might save someone from a lot of anxiety, and more importantly, give them a longer life to enjoy. If you are having some unusual changes to your bowel habits, review these differences and then follow up by making an appointment with Dr. Albert Chung.

Common Symptoms of Both Conditions

Unfortunately, there are some symptoms associated with both IBS and colon cancer, and indications that you might have colon cancer often show up later than IBS. That fact makes it all the more important to know the difference.

Some of the common indications of both conditions include cramps, abdominal pain, constipation, diarrhea, along with noticeable changes in a person's bowel habits. These symptoms could be signs of either condition, which is why all people are advised to complete regular screenings for colon cancer.

How To Tell the Difference

Although many of the same symptoms can be present with both IBS and colon cancer, there are some additional warning signs of colon cancer. A persistent change in bowel habits is the most important signal.

Shared with IBS
Symptoms of both
  • Cramps
  • Abdominal pain
  • Constipation
  • Diarrhea
  • Changes in bowel habits
Red flags
Warning signs of colon cancer
  • Change in stool consistency or narrow stool
  • Rectal bleeding or blood in the stool
  • Feeling you haven't finished emptying your bowels
  • Fatigue and weakness
  • Unexplained weight loss
  • Vomiting
  • Frequent gas pains
  • Anemia from blood loss

If any of these symptoms last for more than a few days, you should seek an appointment with Dr. Chung for further evaluation.

How Colon Cancer Develops

Colon cancer begins with small polyps in the intestine. When they are small, there are few if any symptoms at all. These polyps, however, can gradually mutate into cancerous cells.

92%
Five-year survival rate when colon cancer is caught in its early stages. The rate drops significantly when caught later.
Screening guidance: To be safe, begin having screenings at age 45, unless you have other risk factors that may warrant diagnostic testing at a younger age.

Additional Risk Factors for Colon Cancer

If any of the following apply to you, you are at higher risk, and you might want to begin screening earlier and more frequently than what's recommended for the general population. Risk also rises with age, though in the last decade more young adults are being diagnosed with this condition.

Personal & family history
  • Family history of colon cancer
  • Personal history of colon polyps or colon cancer
  • African-American ethnicity
  • Chronic inflammatory bowel conditions (ulcerative colitis, Crohn's disease)
Lifestyle
  • A high fat, low fiber diet
  • Sedentary lifestyle
  • Being overweight
  • Smoking
  • Excessive alcohol use
Medical
  • Diabetes
  • Previous radiation therapy to the abdomen

Schedule a screening

Routine colorectal cancer screenings are all-important. If you're experiencing any symptoms of IBS or colon cancer, don't wait to get clarity.

Book a consultation Call (714) 988-8690