Doctors list five often-missed bowel-cancer signs: unexplained weight loss, dark stools, rectal bleeding, new bowel changes and sudden-onset gut symptoms. Some are mistaken for IBS, hemorrhoids or stress; they urge medical evaluation for persistent or unexplained symptoms.
Dr. Andrew Dam advises evaluation for unintentional weight loss of more than 5–10 pounds, or if accompanied by fatigue, anemia or bowel changes. He says bowel changes after age 45, those persisting more than four to six weeks, narrowed stools or incomplete evacuation also warrant evaluation. For rectal bleeding, Dam says see a doctor if it lasts more than one to two weeks, is mixed into stool, or comes with fatigue or anemia; another surgeon says all rectal bleeding should be reported to a doctor. Dam says colorectal-cancer screening recommendations support starting at 45.
IBS can coexist with bowel cancer, and symptoms such as constipation and diarrhea overlap. Jackson described a client who attributed symptoms to longstanding IBS before receiving a colorectal-cancer diagnosis. Sudden-onset gut symptoms do not automatically mean cancer; Jackson said they can also indicate bile acid diarrhea or inflammatory bowel disease. The article says one in three adults cannot name a single bowel-cancer symptom, while nearly 1.5 million people in the U.S. live with the disease.
