Cervical cancer is a cancer that starts in the cells lining the cervix, the narrow lower part of the uterus that connects to the vagina. Nearly all cases are caused by persistent infection with certain strains of human papillomavirus (HPV), and the disease develops slowly enough that routine screening can catch it at a precancerous stage, years before it becomes life-threatening. When detected early and still confined to the cervix, the five-year survival rate is 91%.
How Cervical Cancer Develops
The cervix has two distinct zones. The outer surface (exocervix) is covered in flat cells, while the inner canal (endocervix) is lined with mucus-producing gland cells. When HPV infects these cells and the immune system fails to clear the virus, the infection can persist for years and gradually cause genetic changes that turn normal cells into precancerous ones. Left undetected, those precancerous cells can eventually become invasive cancer.
Up to 9 out of 10 cervical cancers are squamous cell carcinomas, which arise from the flat cells on the outer cervix. Most of the remaining cases are adenocarcinomas, which develop from the gland cells of the inner canal. The distinction matters because these two types can behave somewhat differently and may be detected at different points during screening.
The Role of HPV and Other Risk Factors
HPV types 16 and 18 alone are responsible for roughly 70% of all cervical cancers worldwide. The nine-valent HPV vaccine covers these two strains plus five additional cancer-causing types, collectively accounting for about 81% of cervical cancers in the United States. HPV is extremely common, and most infections clear on their own within a year or two. Only a small fraction persist long enough to trigger the cell changes that lead to cancer.
Several factors raise the odds that an HPV infection will progress. Smoking, including regular exposure to secondhand smoke, increases the risk, and the more a person smokes, the higher that risk climbs. A weakened immune system also plays a significant role. People living with HIV, those taking immunosuppressive medications after an organ transplant, or those being treated for autoimmune conditions are more likely to develop persistent HPV infections that progress to cancer.
Symptoms at Different Stages
Early cervical cancer typically causes no symptoms at all, which is why screening is so important. Many people are diagnosed before they ever notice anything unusual. As the disease advances, the most common warning sign is abnormal vaginal bleeding: bleeding between periods, after sex, or after menopause. Unusual vaginal discharge, sometimes watery or tinged with blood, can also occur. In later stages, cancer that has spread to surrounding tissues may cause pelvic pain, pain during sex, leg swelling, or problems with urination or bowel function.
How It’s Found and Diagnosed
Cervical cancer is one of the few cancers with a well-established screening pathway that can catch the disease before it starts. The U.S. Preventive Services Task Force recommends that people with a cervix begin screening at age 21 with a Pap test every three years. Starting at age 30, the preferred approach shifts to an HPV test every five years. Alternatively, people aged 30 to 65 can continue with Pap tests every three years or combine an HPV test with a Pap test every five years.
When screening turns up an abnormal result, the next step is usually a colposcopy. During this procedure, a clinician uses a magnifying instrument to closely examine the cervix after applying a dilute vinegar solution, which makes abnormal areas easier to see. Small tissue samples (biopsies) are taken from any suspicious spots and sent to a lab. If the biopsy confirms precancerous changes or cancer, imaging tests help determine how far the disease has spread.
Staging: How Far It Has Spread
Cervical cancer is staged from I through IV based on how deeply the tumor has grown and whether it has reached nearby or distant tissues.
- Stage I: The cancer is confined entirely to the cervix. This ranges from microscopic tumors detectable only under a microscope to larger tumors still limited to the cervix.
- Stage II: The cancer has grown beyond the cervix into the upper vagina or surrounding tissue but has not reached the pelvic wall or lower vagina.
- Stage III: The tumor extends to the lower third of the vagina, reaches the pelvic wall, affects kidney function, or has spread to nearby lymph nodes.
- Stage IV: The cancer has spread to the bladder, rectum, or distant organs such as the lungs or liver.
Staging directly shapes treatment decisions and gives a clearer picture of prognosis. Lymph node involvement, even with a small tumor, bumps the stage to at least III under the current system revised in 2024.
Survival Rates by Stage
Five-year relative survival rates, based on data from people diagnosed between 2015 and 2021, vary dramatically depending on how far the cancer has spread at the time of diagnosis. Localized disease (confined to the cervix) carries a 91% five-year survival rate. Regional disease (spread to nearby tissues or lymph nodes) drops to 62%. Distant disease (spread to organs far from the cervix) has a 20% five-year survival rate. Across all stages combined, the overall rate is 68%.
These numbers reflect averages across large populations and don’t account for individual factors like age, overall health, or how well a particular cancer responds to treatment. They do, however, underscore a consistent message: early detection dramatically improves outcomes.
Treatment Options
Treatment depends heavily on the stage at diagnosis and whether preserving fertility is a priority.
For the earliest cancers, confined to a tiny area of the cervix, a cone-shaped tissue removal (conization) may be all that’s needed. This outpatient procedure removes the cancerous tissue while keeping the rest of the cervix and uterus intact. When the cancer is slightly more advanced but still limited to the cervix, a hysterectomy is the standard approach. For people who want to preserve the ability to become pregnant, a procedure called a radical trachelectomy removes most of the cervix while leaving the uterus in place.
For stage IB and IIA cancers, treatment typically involves either surgery with lymph node removal or a combination of radiation and chemotherapy. Radiation for cervical cancer often uses both external beams directed at the pelvis and an internal source placed near the tumor. Chemotherapy given alongside radiation helps the radiation work more effectively. This combination is the backbone of treatment for more advanced disease as well.
For stage IIB through IVA, most people receive combined radiation and chemotherapy rather than surgery. Stage IVB cancer, or cancer that has come back after initial treatment, may be treated with immunotherapy, sometimes paired with chemotherapy or targeted therapy drugs that block tumor blood supply.
Prevention Through Vaccination and Screening
The HPV vaccine is the single most effective tool for preventing cervical cancer. In clinical trials, it showed close to 100% efficacy at preventing persistent infections and precancerous changes caused by the HPV strains it targets. The CDC recommends routine vaccination at ages 11 or 12, though it can start as early as age 9. For those who weren’t vaccinated on schedule, catch-up vaccination is recommended through age 26.
Vaccination doesn’t eliminate the need for screening. Not all cervical cancers are caused by the strains the vaccine covers, and people vaccinated later in life may have already been exposed to HPV. Combining vaccination with regular screening offers the strongest protection, catching the small number of cases that vaccination alone might miss.