Final answer:
The 1st stage of colorectal cancer is Stage I, where the cancer is within the colon or rectum but hasn't spread beyond its walls. This is a critical stage for effective treatment, and screening methods like colonoscopy are essential for early detection and prevention.
Step-by-step explanation:
The 1st stage of colorectal cancer is known as Stage I. In this stage, the cancer has grown through the superficial lining (mucosa) of the colon or rectum but hasn't spread beyond the colon wall or rectum. This initial stage is crucial for treatment and prognosis as it is often when cancer can be most effectively treated. Early detection through screening such as colonoscopy can be particularly beneficial. During a colonoscopy, not only can colorectal cancer be detected, but pre-cancerous polyps can also be removed, preventing the potential progression to cancer.
People with certain risk factors, including a family history of colorectal cancer, smoking, excessive alcohol consumption, and a high-fat diet, may have a higher risk of developing colorectal cancer, and should discuss screening options with their healthcare provider. Symptoms such as constipation, diarrhea, abdominal pain, and rectal bleeding may indicate colorectal cancer, highlighting the importance of early diagnostic procedures like colonoscopy for those over 50 years of age.