Viral cancer warning

A marathoner can look healthy on the outside and still have a tumor growing inside the colon, because colorectal cancer often starts as a small polyp in the lining and can stay silent for years. Doctors screen for it before symptoms show up for exactly that reason. (cancer.gov) (cdc.gov) A polyp is a tiny overgrowth, like a skin tag on the inside of the intestine, and a colonoscopy lets a doctor remove it before it turns into cancer. That is why colorectal screening is one of the few cancer tests that can actually prevent the disease, not just catch it early. (cancer.gov 1) (cancer.gov 2) The age line moved because the disease moved. The American Cancer Society lowered its average-risk starting age from 50 to 45 in 2018, and the United States Preventive Services Task Force followed in 2021 after cases in younger adults kept rising. (cancer.org) (uspreventiveservicestaskforce.org) That shift was not about a tiny edge case. The American Cancer Society says colorectal cancer cases among adults younger than 55 rose from 11 percent of all cases in 1995 to 20 percent in 2019. (cancer.org) The official advice for most adults is now simple: start screening at 45 and keep going through 75 if you are at average risk. People with a family history, inflammatory bowel disease, or certain inherited syndromes may need to start earlier and be checked more often. (cdc.gov) (cancer.org) Screening does not mean only one test. The federal recommendation includes a yearly fecal immunochemical test, a stool DNA test every 1 to 3 years, or a colonoscopy every 10 years, and any abnormal stool test has to be followed by a colonoscopy. (uspreventiveservicestaskforce.org) (cancer.gov) The reason late diagnoses are so frightening is that colon cancer often spreads through blood draining from the intestines straight to the liver. In colorectal cancer, the liver is the most common place for distant spread. (cmghjournal.org) (hopkinsmedicine.org) People often wait because the early warning signs can sound ordinary: blood in the stool, a change in bathroom habits, belly pain, unexplained weight loss, or tiredness. By the time those symptoms are obvious, the disease may no longer be limited to the colon. (cdc.gov) (cancer.gov) The frustrating part is that many people who just became eligible are still not getting checked. An American Cancer Society study found screening in 45- to 49-year-olds rose after the guideline changes, but that age group still lagged far behind older adults. (cancer.org) (aacrjournals.org) In 2026, the American Cancer Society expects nearly 159,000 new colorectal cancer cases in the United States, or about 440 diagnoses a day. The least dramatic part of this story is still the most useful one: for millions of adults, the next step is not a search for symptoms but a screening appointment on the calendar. (cancer.org)