Medically reviewed by Marjorie Zauderer, MD

Staying current on cancer screenings is one of the most effective things a person can do for their long-term health, but knowing exactly which tests apply to you, and when to start them, isn’t always straightforward. Guidelines have shifted in recent years, risk factors vary from person to person, and two people of the same age may need very different screening schedules.

The starting point for most adults is understanding the difference between average-risk and elevated-risk recommendations.

Average-Risk Guidelines by Screening Type

For adults with no significant personal or family history of cancer, national guidelines provide a general framework for when to begin each type of screening.

Breast Cancer

• Annual mammograms are recommended starting at age 45 for women at average risk
• Women aged 40 to 44 may begin annual screening if they choose
• At age 55, women can transition to every-other-year mammograms or continue annually
• Screening should continue as long as a woman is in good health

Colorectal Cancer

• Screening begins at age 45 for average-risk adults
• Options include colonoscopy or stool-based tests; a primary care provider can help determine which is most appropriate
• Colonoscopy carries an added advantage: precancerous polyps can be identified and removed during the same procedure

Cervical Cancer

• Screening begins between ages 21 and 25 and continues through age 65
• An HPV test every five years is the preferred approach; a combined HPV/Pap test every five years or a Pap test alone every three years are acceptable alternatives

Prostate Cancer

• Screening decisions are individualized and should be made in conversation with a healthcare provider, typically around age 55 for average-risk men
• PSA blood test results and personal risk factors together guide how frequently testing should occur

Lung Cancer

• Annual low-dose CT scans are recommended for adults aged 50 to 80 with a 20-pack-year smoking history who currently smoke or quit within the last 15 years

When Risk Factors Change the Timeline

For some people, average-risk guidelines aren’t the right starting point. Family history, genetics, and personal health history can all move the timeline earlier, sometimes by a decade or more.

Reasons a provider may recommend starting screenings sooner or more frequently include:

• A first-degree relative (parent, sibling or child) diagnosed with colorectal or breast cancer, particularly at a younger age
• A known genetic mutation, such as BRCA1 or BRCA2, which significantly elevates breast and ovarian cancer risk
• A personal history of polyps, abnormal Pap results or prior cancer treatment
• Inflammatory bowel disease, which increases colorectal cancer risk over time
• Dense breast tissue, which may warrant supplemental imaging beyond standard mammography

For people with elevated genetic risk, screening may begin as early as age 25 to 30 for certain cancers, and additional imaging, such as breast MRI, may be recommended alongside standard tests.

Talking to Your Doctor About Your Personal Plan

No single screening schedule fits everyone. A primary care provider or specialist can review your health history and family background to determine:

• Which screenings are most relevant for your age and risk profile
• Whether you qualify for earlier or more frequent testing
• How recent guideline updates affect your current plan

This conversation is also the right time to ask about any new screening approaches that may be relevant. Some diagnostic tools that have received recent attention, including certain blood-based tests, are still being evaluated for routine screening use and are not yet part of standard clinical guidelines.

If You’ve Fallen Behind

Missing a scheduled screening doesn’t mean starting over or that an opportunity has been lost. The most important step is simply scheduling the test. A provider can help prioritize which screenings to address first and establish a plan going forward.

Some screenings don’t just detect cancer early; they can prevent it from developing in the first place. Colonoscopy and cervical screening are two examples where finding and treating abnormal cells or tissue can stop cancer before it starts.

Screening recommendations vary slightly by organization (USPSTF, ACS, ACOG). This article reflects a composite of current national guidance; individual recommendations may differ based on insurer or health system. Learn more about cancer care at WMCHealth.