If you're in your 40s, it's smart to see a gastroenterologist for a colon cancer screening. "Colourectal cancer is the third most common cancer and the second leading cause of cancer deaths in both men and women," Dr. Berookim told POPSUGAR. "The most recent guidelines from the American Cancer Society recommend women begin colon cancer screening at age 45, rather than the previously recommended age of 50, then typically every 10 years thereafter. Those with a family history of colourectal cancer, rectal bleeding, or change in bowel habits should get screened sooner." As always, you should tell your doctor if you're experiencing any unusual symptoms.