For adults in the United States who have no symptoms and are at average risk, routine screening recommendations focus on breast, cervical and colorectal cancer. Annual low-dose CT is recommended for a narrower group with a substantial smoking history. The right test depends on age, the organ being screened, prior results and which guideline organization is being followed.
Screening is for people without symptoms. A lump, unexplained bleeding, a persistent change in bowel habits, coughing blood or another concerning symptom needs medical evaluation rather than waiting for the next screening date.
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Average-risk screening at a glance
The table summarizes major U.S. recommendations for people without symptoms. “Average risk” does not include a personal cancer history, certain high-risk precancers, hereditary cancer syndromes or other conditions that substantially change risk.
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| Cancer | Who is covered | Test and interval | Age or stopping guidance | Guideline or source |
|---|---|---|---|---|
| Breast | Average-risk women and other people assigned female at birth | Mammography every two years | Ages 40–74; evidence is insufficient to assess routine screening at 75 or older | USPSTF final recommendation, April 30, 2024; summarized by NCI |
| Cervical | People with a cervix who are at average risk | USPSTF: Pap every three years at 21–29; at 30–65, primary high-risk HPV every five years, HPV/Pap cotest every five years, or Pap every three years. ACS: primary HPV every five years from 25–65, with alternatives | USPSTF advises against screening after 65 when prior screening is adequate and no high-risk condition exists. Different rules apply after hysterectomy or with inadequate prior screening. | NCI summary updated February 13, 2025 |
| Colorectal | Asymptomatic adults at average risk | Stool tests, CT colonography, flexible sigmoidoscopy or colonoscopy at intervals shown below | Routine screening ages 45–75; ages 76–85 selectively, based on health, prior screening and preferences | USPSTF recommendation; NCI EBCCP summary updated August 18, 2025 |
| Lung | Adults with a qualifying smoking exposure | Low-dose CT every year | Ages 50–80, at least 20 pack-years, currently smoking or quit within the past 15 years | USPSTF final recommendation, 2021 |
These schedules are U.S. guidance. A clinician may recommend a different plan when risk, prior results, life expectancy, access or personal preferences change the balance of benefit and harm.
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What “average risk” means
Average risk describes a population for which routine screening schedules were developed. It is not a guarantee of low risk and does not mean every test is appropriate for every adult. Breast guidance, for example, excludes people with certain harmful BRCA variants, prior high-dose chest radiation at a young age, prior breast cancer or some high-risk breast lesions. Colorectal guidance excludes people with previous colorectal cancer, adenomatous polyps, inflammatory bowel disease or a known hereditary syndrome such as Lynch syndrome or familial adenomatous polyposis.
Family history can also alter recommendations, particularly when a relative was diagnosed young or several relatives are affected. Tell the clinician about prior abnormal tests, biopsies, cancer treatment, organ-removing surgery, genetic testing, medications and smoking exposure before choosing an interval.
Breast cancer screening
USPSTF mammography schedule
The U.S. Preventive Services Task Force recommends screening mammography every two years from age 40 through 74 for average-risk women and other people assigned female at birth. The 2024 final recommendation does not establish that the benefits outweigh the harms for routine screening beginning at age 75. Decisions beyond 74 therefore require an individualized discussion rather than an automatic continuation of the same schedule.
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When the standard schedule does not apply
People with a harmful BRCA variant, a history of high-dose radiation to the chest at a young age, previous breast cancer or certain high-risk lesions may need earlier, more frequent or additional imaging. Dense breast tissue creates an evidence gap: the USPSTF has not determined whether routinely adding ultrasound or MRI produces more benefit than harm for average-risk people with dense breasts. Do not treat density alone as a universal instruction to obtain supplemental imaging; ask what is appropriate for the individual report and risk profile.
Cervical cancer screening
USPSTF options
The NCI summary of USPSTF guidance recommends a Pap test (cytology) every three years for ages 21–29. From 30 through 65, an average-risk patient can choose one of three strategies: primary high-risk human papillomavirus (HPV) testing every five years, HPV/Pap cotesting every five years, or Pap testing alone every three years. These are alternative pathways, not tests to perform all at once at every visit.
Why the ACS schedule looks different
The American Cancer Society guidance summarized by NCI starts routine screening at age 25 and prefers primary HPV testing every five years through age 65. HPV/Pap cotesting every five years or cytology every three years are acceptable alternatives when primary HPV testing is not available. Because the starting age differs, a patient should identify which organization’s schedule a clinic is using instead of mixing rules from different guidelines.
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When screening can stop
Under the cited USPSTF summary, screening after 65 is not recommended when a person has had adequate prior screening and has no other high-risk condition. Inadequate prior screening or a history of high-grade precancer or cervical cancer can require continued surveillance. Screening is also not recommended after total hysterectomy with removal of the cervix when there is no relevant history of high-grade precancer or cervical cancer. HPV vaccination lowers risk but does not eliminate the need to follow an appropriate screening schedule.
Colorectal cancer screening
Who should start
USPSTF recommends offering colorectal cancer screening beginning at age 45 for asymptomatic adults at average risk and continuing routine screening through age 75. From 76 to 85, clinicians should offer screening selectively, considering overall health, previous screening, expected benefit and the person’s preferences. The recommendation is for people without a personal history of colorectal cancer or adenomatous polyps, inflammatory bowel disease or a diagnosed hereditary syndrome that causes high lifetime risk.
Available strategies and intervals
There is no single best test for everyone. The useful test is one a person can complete on schedule and follow through after an abnormal result.
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| Strategy | Interval | What it involves |
|---|---|---|
| High-sensitivity guaiac fecal occult blood test or fecal immunochemical test (FIT) | Every year | Stool collection at home followed by laboratory testing for blood |
| Stool DNA-FIT | Every one to three years | At-home stool collection testing for blood and abnormal DNA markers |
| CT colonography | Every five years | Computed-tomography visualization of the colon; bowel preparation is still required |
| Flexible sigmoidoscopy | Every five years | Endoscopic examination of part of the colon |
| Flexible sigmoidoscopy plus annual FIT | Sigmoidoscopy every 10 years with FIT every year | Combines periodic visualization with yearly stool testing |
| Colonoscopy | Every 10 years | Direct examination of the colon with the ability to remove tissue during the procedure |
What happens after an abnormal result
A positive stool test is not a cancer diagnosis. It generally needs follow-up colonoscopy. CT colonography or flexible sigmoidoscopy that finds a lesion without removing it may also require colonoscopy for definitive evaluation. Choosing a stool test without arranging a pathway for follow-up leaves the screening process incomplete.
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Eligibility
USPSTF recommends annual low-dose computed tomography for adults ages 50–80 who have accumulated at least 20 pack-years and currently smoke or quit within the past 15 years. A pack-year equals smoking one pack per day for one year; two packs per day for 10 years also equals 20 pack-years. The recommendation is based on age and smoking exposure, not on being an average-risk adult in general.
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People outside those criteria should not assume that an annual CT provides a proven benefit. Low-dose CT can produce false-positive findings and additional testing, so eligibility and the ability to complete follow-up should be confirmed with a clinician.
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Why other cancer tests are not routine for average-risk people
Ovarian cancer
The NCI screening overview says that CA-125 blood testing and transvaginal ultrasound have not been shown effective for routine ovarian-cancer screening in average-risk people. An abnormal result can lead to imaging or procedures without demonstrating a mortality benefit, so these tests are not a general substitute for evaluation of symptoms or a high-risk plan.
Prostate cancer
Routine PSA screening is not an automatic recommendation for every average-risk man. Expert groups cited by NCI generally discourage blanket screening because false-positive results and overdiagnosis can lead to biopsies and treatment that may not improve a person’s health. Whether to have PSA testing should be an individualized decision that weighs age, family history, race and ethnicity, health, potential benefits and possible harms.
Multi-cancer early-detection tests
Tests marketed to look for signals from several cancers at once remain an evolving area. NCI says their effectiveness for screening people without symptoms is unknown and requires randomized trials; the NCI page states that no such tests had FDA approval when it was published. A commercial test should not replace recommended breast, cervical, colorectal or lung screening.
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Screening aims to detect cancer or a precancer before symptoms, when treatment may be more successful. For a screening program to be worthwhile, it should find disease early, reduce the chance of dying from that cancer among people screened regularly and provide benefits that outweigh harms.
- False positives: An abnormal screen may be followed by repeat imaging, biopsies, colonoscopy or other procedures even when cancer is absent.
- False negatives: A normal result lowers risk but cannot guarantee that cancer is not present or will not develop before the next interval.
- Overdiagnosis: Screening can find a cancer that would never have caused symptoms during a person’s lifetime.
- Overtreatment: Treatment for an overdiagnosed or otherwise low-risk finding can cause lasting physical or emotional effects.
- Procedure-related harm: Follow-up can involve bleeding, infection, perforation, radiation exposure or other complications, depending on the test.
These trade-offs explain why screening intervals, age ranges and eligibility criteria are specific rather than “more often is always better.”
How to make a personal screening plan
- List your risk information. Record age, sex assigned at birth and organs present, smoking amount and quit date, prior screening results, biopsies, surgeries, radiation, inflammatory bowel disease, polyps, cancer diagnoses and relatives’ cancer histories.
- Confirm that you are asymptomatic. New symptoms require clinical assessment, even if a screening test was recently normal.
- Match each organ to a guideline. Use the breast, cervical, colorectal and lung criteria above, and identify whether your clinician follows USPSTF or ACS cervical guidance.
- Choose a feasible colorectal method. Consider preparation, anesthesia, time away from work, transportation, invasiveness, interval and the ability to obtain colonoscopy if a non-colonoscopy test is positive.
- Schedule follow-up before testing. Ask who will receive the result, how quickly it will be communicated and what happens after an abnormal finding.
- Reassess after major changes. A new family diagnosis, abnormal result, genetic finding, cancer treatment, hysterectomy, smoking change or new symptom can move you out of the average-risk pathway.
People who cannot easily pay for or access screening can ask about public programs. NCI describes the CDC National Breast and Cervical Cancer Early Detection Program as providing screening services to eligible low-income, uninsured women; eligibility and availability are determined locally.
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