Warning Sign 1: Blood During or After a Bowel Movement
Blood in the stool is one of the most important symptoms to take seriously. Depending on the location of the bleeding and how quickly blood moves through the digestive tract, it may appear in different forms.
Some people notice bright red blood on toilet paper after wiping. Others see streaks on the surface of their stool, drops of blood in the toilet bowl, or a reddish discoloration in the water. In some cases, bleeding is not visible at all and is detected only through a stool test or blood tests that reveal anemia.
Colon polyps can bleed when their surface becomes irritated or fragile. Larger polyps may be more likely to cause noticeable bleeding, although even small lesions can sometimes bleed. Repeated, slow blood loss can contribute to iron-deficiency anemia, which may cause tiredness, weakness, shortness of breath during activity, dizziness, or pale skin.
However, rectal bleeding is not specific to polyps. Hemorrhoids, anal fissures, inflammatory bowel disease, intestinal infections, diverticular disease, and colorectal cancer can also cause bleeding. Certain foods and medications can change stool color, too, although genuinely black, tarry stool may indicate bleeding higher in the digestive tract.
A common mistake is assuming that bright red blood must be caused by hemorrhoids. Hemorrhoids are frequent, but their presence does not rule out another condition. Someone can have hemorrhoids and a separate problem inside the colon at the same time.
When should you seek medical attention?
Arrange a medical assessment if you experience unexplained rectal bleeding, particularly if it happens repeatedly, continues for more than a short period, or occurs alongside changes in bowel habits, abdominal discomfort, fatigue, or unexplained weight loss.
Seek emergency care if bleeding is heavy or ongoing, you pass large blood clots, or bleeding is accompanied by fainting, severe dizziness, marked weakness, shortness of breath, or severe abdominal pain.
It is important not to wait for bleeding to become severe before seeking advice. Early evaluation can help identify the cause and determine whether further testing, including colonoscopy, is appropriate.
Warning Sign 2: Persistent Changes in Bowel Habits
A person's bowel habits can vary naturally. Some people have a bowel movement several times a day, while others go every other day. What matters most is a persistent change from an individual's usual pattern.
Colon polyps may sometimes contribute to changes in bowel movements, especially when they become large enough to affect the passage of stool. Depending on their location and size, symptoms can include diarrhea, constipation, or alternating episodes of both.
For example, someone who normally has regular bowel movements may begin experiencing frequent loose stools without an obvious dietary or infectious explanation. Another person may develop persistent constipation despite drinking adequate fluids and consuming more fiber. Some people notice a new sense of urgency or feel that they need to return to the toilet shortly after finishing.
These symptoms do not necessarily indicate polyps. Dietary changes, stress, medications, irritable bowel syndrome, thyroid disorders, infections, and other digestive conditions can all alter bowel habits. Nevertheless, a persistent unexplained change deserves attention, particularly when it appears later in adulthood or occurs alongside other warning signs.
What about unusually narrow stools?
People sometimes worry that pencil-thin stools automatically signal colon cancer or polyps. Stool shape can change for many reasons, including temporary constipation, stool consistency, and changes in intestinal movement. Narrow stools alone are not a reliable way to diagnose a colorectal condition.
However, a sustained change in stool shape combined with bleeding, persistent constipation, abdominal pain, or a feeling of incomplete emptying should not be dismissed.
How long is too long?
There is no single time limit that applies to every person. As a practical guide, bowel changes that persist for several weeks, recur frequently, or worsen over time should be discussed with a healthcare professional. Seek advice sooner if symptoms are significant or if you have a strong family history of colorectal cancer.
Keeping a brief record of bowel frequency, stool consistency, bleeding, pain, and any changes in diet or medication can help your clinician understand the pattern. The goal is not to diagnose yourself at home, but to provide accurate information that supports appropriate evaluation.
Warning Sign 3: A Feeling That Your Bowel Has Not Emptied Completely
Another symptom worth discussing with a doctor is the persistent sensation that stool remains in the rectum even after a bowel movement. This feeling is sometimes called incomplete evacuation or, when associated with rectal urgency, tenesmus.
A person may finish using the toilet but still feel pressure, fullness, or an urge to go again. They may return to the toilet several times, pass only small amounts of stool, or strain despite having little left to pass.
This symptom can occur for many reasons. Constipation, pelvic floor dysfunction, hemorrhoids, rectal inflammation, irritable bowel syndrome, and other digestive conditions can create a similar sensation.
In some cases, a large polyp located in the rectum may contribute to this feeling by occupying space or irritating the surrounding tissue. A rectal growth or another condition affecting the bowel can also produce persistent urgency or a sense of obstruction.