Most cancer screening starts between ages 40 and 50, depending on the type of cancer, and the schedule is simpler than you might expect. A handful of routine tests, spaced out over years, covers the major cancers that screening can catch early. Here’s what’s recommended, organized by cancer type, so you can see exactly what applies to you and when.
Breast Cancer: Every 2 Years Starting at 40
The U.S. Preventive Services Task Force recommends mammograms every two years for all women ages 40 through 74. This is a straightforward screening with no special eligibility requirements for average-risk women. A mammogram takes about 20 minutes, and most imaging centers can schedule one within a few weeks.
If you have a strong family history of breast cancer, a known BRCA gene variant, or a personal history of chest radiation, your doctor may recommend starting earlier or screening more frequently, sometimes with MRI in addition to mammography. Black women and women of Ashkenazi Jewish descent also have higher rates of certain genetic variants linked to breast cancer and may benefit from earlier conversations about screening and genetic testing.
Colorectal Cancer: Start at 45
Screening for colorectal cancer is recommended for all adults ages 45 to 75. You have several options, and a colonoscopy isn’t the only one. Stool-based tests you can do at home are equally accepted as a first-line approach for people at average risk.
- Stool blood tests (FIT or gFOBT): Done once a year. You collect a small sample at home and mail it to a lab, which checks for hidden blood in your stool.
- Stool DNA test: Done every three years. You collect an entire bowel movement and send it to a lab, where it’s checked for both blood and abnormal DNA markers.
- Colonoscopy: Done every 10 years for average-risk people. If a stool test comes back positive, you’ll need a colonoscopy as a follow-up regardless.
If you have a parent, sibling, or child who was diagnosed with colorectal cancer, especially before age 50, your doctor will likely recommend starting screening earlier and using colonoscopy rather than stool tests.
What Colonoscopy Prep Actually Looks Like
The prep is the part most people dread, but it follows a predictable timeline. The day before your exam, you switch to clear liquids only. At around 6 PM that evening, you drink the first half of a bowel prep solution. Then four to six hours before your scheduled procedure, you drink the second half. You’ll know the prep is working when your stool becomes a clear, yellowish liquid. Two hours before the exam, you stop drinking entirely. The whole process takes roughly 18 hours from start to finish, and most people take one day off work for it.
Cervical Cancer: Starts at 21 or 25
Cervical cancer screening guidelines vary slightly depending on which organization you follow, but the general framework is the same. The USPSTF recommends a Pap test starting at age 21, repeated every three years through age 29. From 30 to 65, you can switch to an HPV test every five years, a combined HPV and Pap test every five years, or continue with Pap tests every three years.
The American Cancer Society updated its guidelines in 2025 and now recommends starting at age 25 with an HPV test every five years through age 65, skipping the Pap-only approach for younger women. Either set of guidelines is reasonable to follow.
After age 65, most women can stop screening entirely if they’ve had consistently normal results. If your recent results were abnormal or you haven’t been screened regularly, your doctor may recommend continuing past 65. Even if you’re sexually active before age 21, cervical cancer is rare enough in that age group that earlier screening isn’t recommended.
Lung Cancer: Only for Current or Recent Smokers
Lung cancer screening isn’t for everyone. It’s recommended only if you meet all three criteria: you’re between 50 and 77, you currently smoke or quit within the last 15 years, and you have a smoking history of at least 20 pack-years. A pack-year means averaging one pack of cigarettes per day for one year, so 20 pack-years could be one pack a day for 20 years, or two packs a day for 10 years.
The screening itself is a low-dose CT scan of the chest, which is quick and painless. If you qualify, this is done annually. If you’ve never smoked or quit more than 15 years ago, this screening doesn’t apply to you.
Prostate Cancer: A Conversation, Not a Default
Prostate cancer screening is different from the others because there’s no blanket recommendation to screen everyone. The PSA blood test can detect prostate cancer, but it also produces a high rate of false positives and can lead to biopsies and treatments for cancers that would never have caused symptoms. For that reason, guidelines emphasize a shared decision with your doctor rather than automatic testing.
The American Urological Association suggests that men between 45 and 50 can consider a baseline PSA test after discussing the pros and cons. Men at higher risk, including Black men and those with a strong family history of prostate cancer or known genetic mutations, should have that conversation earlier, between ages 40 and 45. After the initial test, how often you rescreen depends on your PSA level, age, and overall health.
Skin Cancer: Self-Checks Plus Risk-Based Exams
There’s no universal screening schedule for skin cancer the way there is for breast or colorectal cancer. The USPSTF hasn’t issued a recommendation for or against routine skin exams in the general population. Instead, the approach is risk-based.
If you have one or more risk factors, an annual full-body skin exam with a dermatologist is recommended starting as early as age 35. Those risk factors include a personal or family history of melanoma, light skin, blonde or red hair, more than 40 moles, two or more unusual-looking moles, a history of blistering sunburns, or a history of indoor tanning. Being immunocompromised also raises your risk significantly.
Everyone, regardless of risk level, benefits from regular self-exams. Check your skin systematically every month or so, using a mirror or a partner to see your scalp, back, and other hard-to-view areas. What you’re looking for is any new spot, or any existing mole that’s changing in size, shape, or color, or that starts itching or bleeding.
When Family History Changes the Timeline
The ages listed above apply to people at average risk. A strong family history of cancer can shift your screening timeline significantly earlier. Some patterns worth paying attention to: a first-degree relative (parent, sibling, or child) diagnosed with the same cancer, cancer diagnosed at an unusually young age, multiple family members with related cancers like breast and ovarian or colon and uterine, cancer in both of a paired organ (both breasts, both kidneys), or rare cancers like male breast cancer.
If any of these patterns apply, genetic counseling can help determine whether testing for inherited gene variants makes sense. The most well-known are BRCA1 and BRCA2, which significantly raise the risk of breast and ovarian cancer, but there are others linked to colorectal, pancreatic, and prostate cancers. When possible, genetic testing is most informative when it starts with the family member who actually had cancer, since their results help clarify what a negative result means for everyone else.
What Screening Costs You
Under the Affordable Care Act, most health insurance plans are required to cover recommended preventive screenings at no cost to you, with no copay, coinsurance, or deductible. This applies to Marketplace plans and most employer-sponsored plans, as long as you use an in-network provider. Mammograms, colonoscopies, Pap tests, HPV tests, and lung cancer CT scans for eligible individuals all fall under this coverage. If you’re uninsured, many community health centers and cancer organizations offer free or low-cost screening programs.