Persistent Tiredness or Weakness
Colorectal cancer can sometimes cause bleeding that is not visible in the stool. Over time, blood loss may contribute to anemia, which can lead to weakness or fatigue.
Why Screening Matters
One of the most important things to remember is that colorectal cancer does not always cause symptoms, especially during its early stages. Screening can detect precancerous polyps and remove them before they develop into cancer, or find cancer earlier when treatment may be more successful.
In the United States, routine colorectal cancer screening generally begins at age 45 for people at average risk. People with a family history, certain genetic conditions, or other risk factors may need to begin screening earlier.
When Should You See a Doctor?
If you notice blood in your stool, persistent changes in bowel habits, ongoing abdominal pain, unexplained weight loss, or unusual weakness, make an appointment with a healthcare professional. These symptoms do not automatically mean you have cancer—many other conditions can cause them—but medical evaluation can help determine the actual cause.
The Bottom Line
Knowing the possible warning signs of colorectal cancer can help you recognize changes that deserve attention. At the same time, symptoms alone cannot confirm a diagnosis. Regular screening and timely medical evaluation are among the best ways to detect colorectal cancer early and, in some cases, prevent it by finding and removing precancerous polyps.
This article is for general educational purposes and is not a substitute for professional medical advice.
