About-cancer/screening/patient-screening-overview-pdq

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Cancer Screening Overview (PDQ®)–Patient Version

What Is Cancer Screening?

KEY POINTS
  • Cancer screening is looking for cancer before a person has any symptoms.
  • There are different kinds of screening tests.
  • Screening tests have risks.
  • Some screening tests can cause serious problems.
  • False-positive test results are possible.
  • False-negative test results are possible.
  • Finding the cancer may not improve the person's health or help the person live longer.

Cancer screening is looking for cancer before a person has any symptoms. Screening tests can help find cancer at an early stage, before symptoms appear. When abnormal tissue or cancer is found early, it may be easier to treat or cure. By the time symptoms appear, the cancer may have grown and spread. This can make the cancer harder to treat or cure.

It is important to remember that when your doctor suggests a screening test, it does not always mean he or she thinks you have cancer. Screening tests are done when you have no cancer symptoms.

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