Colorectal cancer, comprising colon and rectal malignancies, remains one of the most prevalent cancers and a leading cause of cancer‑related death worldwide. In recent years, incidence rates among younger adults have risen sharply, nearly doubling since the mid‑1990s.
Early symptoms such as constipation, diarrhea, or fatigue are often dismissed as benign gastrointestinal issues, which can delay diagnosis. Physicians therefore stress the importance of recognizing less common warning signs that may prompt timely medical evaluation.
Bowel Incontinence as a Potential Symptom
Bowel incontinence, also referred to as fecal incontinence, is not experienced by most patients with colorectal cancer but can occur, especially when the tumor is located in the rectum. Dr. Jason B. Carter, a urologist and medical adviser with Aeroflow Urology, explains that the symptom often appears later in the disease course, when a growth becomes large enough to obstruct the passage of solid stool.
Dr. Ketan Thanki, a colorectal surgeon at the MemorialCare Todd Cancer Institute in Long Beach, outlines several mechanisms by which the cancer may lead to incontinence: impaired rectal sensation, disruption of nerve signals to the anal sphincter, increased mucus secretion causing diarrhea, and luminal narrowing that forces liquid stool to leak.
Nevertheless, experts caution that bowel incontinence is far more frequently caused by non‑malignant conditions such as age‑related pelvic floor weakness, chronic diarrhea, prior surgery, childbirth‑related injury, or neurological disorders. Any new onset of incontinence should be evaluated by a healthcare professional, but it does not, by itself, confirm a cancer diagnosis.