Cervical Cancer Screening Why Get It

There is something I often hear in the clinic. "I have no symptoms, do I really need to get cervical cancer screening?" To put the conclusion first, it is more important precisely because it is a test you get when you have no symptoms. Cervical cells begin to change quietly long before they become cancer, and at this stage there is usually neither pain nor bleeding. Cervical cancer screening is a tool to detect exactly that "imperceptible change" at the cellular level in advance. Today, rather than the types of tests, I will focus on why you should get it regularly and at what interval it is reasonable to get it.

The biggest feature of cervical cancer is that it does not develop overnight. Most cases begin with persistent infection by human papillomavirus (HPV), as normal cells progress from mild dysplasia through moderate and severe dysplasia to invasive cancer. According to the World Health Organization (WHO, 2024), almost all cervical cancer is described as related to persistent infection by certain high-risk HPV types.

The fact that this progression usually takes place slowly over several years is the very reason screening exists. Slow progression means there is a long "window of time to catch it in between." In the clinic, the longer the period of skipped screening, the more often it is found with dysplasia already advanced. Conversely, for those who keep up regular screening, cell changes are often confirmed at a very early stage, leading to simple follow-up or treatment.

Many people think, "Can't I just get tested when I feel something wrong with my body?" But the pre-cancer stage and early cancer of the cervix have almost no symptoms. By the time symptoms such as bleeding or abnormal discharge appear clearly, the lesion is often already somewhat advanced.

That is why cervical cancer screening uses "the state of the cells" rather than "the presence of symptoms" as its standard. The core of this is the Pap smear, which collects cervical cells and examines them under a microscope for abnormalities, and the HPV test, which directly confirms the presence of the causative virus. The American Cancer Society (ACS, 2020) describes the core value of regular screening as "finding pre-cancerous lesions before they become invasive cancer."

A signal that is easy to dismiss lightly, such as bleeding after intercourse, sometimes leads to a test that confirms a meaningful change. If you have such a signal, a clinic case of testing prompted by post-coital bleeding is also helpful. The most important point, however, is that testing is not only done when symptoms are present.

The two tests look at different things. One looks at "cells that have already changed," and the other at "the cause that triggers the change." So when done together, they fill each other's gaps.

The risk-based management guidelines of the American Society for Colposcopy and Cervical Pathology (ASCCP, 2019) recommend interpreting HPV results and Pap results together to determine the next test timing and whether detailed examination is needed. In other words, the two test results are not viewed separately but read as one picture called "risk." Why HPV is important for women's health is covered in more detail in an article summarizing the meaning of HPV testing and management.

The interval is not "every year no matter what" but varies depending on which test you get and on the results. The key is "consistently, at an appropriate interval." Korea's national cancer screening program (National Cancer Center and National Health Insurance Service, as of 2024) provides cervical cell testing every two years for women aged 20 and over.

International guidelines set different intervals depending on the test method. The American Cancer Society (ACS, 2020) recommends HPV-test-based screening starting from a certain age and performed at multi-year intervals in the average-risk group, and a shorter interval when the Pap smear is used alone. The WHO (2021) recommends screening using a high-performance test (HPV test) in the general population and emphasizes getting it without fail at set points throughout life.

• The "next test timing" varies depending on which test you got.
• It is not recommended to stop screening permanently just because a previous result was normal.
• If there is an abnormality in the result, you will be followed more frequently, at a shorter interval than the standard.

If you are curious about the exact interval that fits you, refer to frequently asked questions about screening intervals, and I recommend confirming your individual schedule through a medical visit.

The value of early detection shows up most in "the difficulty of treatment." When cervical changes are confirmed at the pre-cancer stage, it is reported that progression can often be stopped with a relatively simple procedure or follow-up observation. Conversely, when detection is late and the disease has progressed, the scope of treatment tends to widen and the recovery process to become longer.

The American Cancer Society (ACS, 2020) and U.S. SEER statistics explain that cervical cancer tends to show a favorable course the earlier it is found while still confined to the cervix. Of course, there may be individual variation, and it cannot be concluded that screening eliminates all risk. However, it is clear that regular screening is the most realistic way to bring forward the "time of detection."

Being infected with HPV does not mean it always leads to cancer. This part is often misunderstood, and reading whether HPV infection always leads to cervical cancer together can ease unnecessary anxiety.

The "reasons for putting off screening" I often hear in the clinic fall into a few categories. Each has its own circumstances, but for most people, explaining the purpose of screening again puts their mind at ease.

• "Because I have no symptoms": Getting it when you have no symptoms is the original purpose of screening.
• "Because the test feels burdensome": The collection itself is over quickly, and we explain it fully in advance.
• "Because I am afraid of the result": Most are normal or early changes, and the earlier you know, the more options you have.
• "Because I am busy": Bundling it with the national cancer screening schedule can ease the burden.

In particular, having completed HPV vaccination does not mean screening becomes unnecessary. The vaccine only prevents some high-risk types, not all types. For how to combine vaccination history and screening, the question about vaccination timing is helpful.

Cervical cancer screening is not a test you get once and finish; it is right to see it as part of management that continues throughout your life stages. It is a flow that continues over the long term, from after the start of sexual activity through the recommended age range, adjusting the interval according to the results.

In the clinic, I sometimes compare cervical cancer screening to "insurance." Keeping it up steadily when nothing is wrong is the most reassuring. Managing it regularly bundled with other gynecological screenings also reduces the risk of missing it. If you want a comprehensive check, you may also consider configurations such as lifecycle screening or intensive HPV and cervical cancer care.

Specific points such as screening interval, interpretation of previous results, and combining it with the vaccine differ for each person. Rather than vaguely putting it off, I recommend getting a check once.

Written by Lee Dong-hee, Director · OB-GYN specialist · See physician profile

First published April 15, 2024 · Last reviewed May 30, 2026

References: American Cancer Society ACS Cervical Cancer Screening Guidelines (2020), American Society for Colposcopy and Cervical Pathology ASCCP Risk-Based Management Guidelines (2019), World Health Organization WHO Cervical Cancer (2021·2024), National Cancer Center and National Health Insurance Service National Cancer Screening (2024), U.S. SEER Statistics (2024)

This article is intended to provide general health information and does not replace individual diagnosis or treatment. If you have symptoms, please consult through a medical visit.