Colon cancer develops in the large intestine (colon) and many times starts as a polyp (a small growth on the inner lining). The tricky part is: early colon cancer may cause no symptoms, or the symptoms may look like common problems such as piles, acidity, IBS, or infection. That’s why knowing the warning signs—and understanding what they actually mean—is very important.

1) Changes in Bowel Habits (One of the earliest clues)

→ Persistent constipation or diarrhea

→ If your stool pattern changes and stays changed for more than 2–3 weeks, it needs evaluation

→ Colon cancer can irritate the bowel lining (causing diarrhea) or partially block the passage (causing constipation)

→ A “new pattern” matters more than occasional constipation/loose stools

→ Alternating constipation and diarrhea

→ Some people notice cycles: a few days of constipation followed by loose stools

→ This can happen when stool struggles to pass a narrowed area, then suddenly moves past it

2) Change in Stool Shape or Size

→ Narrow, pencil-thin stools

→ A growth inside the colon can narrow the passage, so stool comes out thinner than usual

→ If you notice thinner stools repeatedly (not just once), it’s a warning sign

→ Smaller quantity stools / frequent small stools

→ A blockage may prevent complete stool passage, leading to frequent trips with small output

3) Blood in Stool (Very Important Sign)

Read more on next page