Overview
- An American Cancer Society analysis reports cases in adults under 50 are rising about 3% each year and now account for the top cause of cancer death in that age group.
- Guidelines lowered routine screening to age 45, yet specialists advise earlier colonoscopy for those at elevated risk based on family history or concerning symptoms.
- Experts recommend starting at about 40, or 10 years younger than the youngest affected first‑degree relative, for people with a close family history of colorectal cancer.
- Inherited syndromes such as Lynch syndrome and familial adenomatous polyposis carry markedly higher risk and call for surveillance beginning in early adulthood or even the teen years.
- Three in four patients under 50 are diagnosed at regional or distant stages, underscoring the need to evaluate red flags like rectal bleeding, persistent bowel changes, abdominal pain, unexplained weight loss or fatigue.