If your Pap smear results mention epithelial cell abnormality, it is completely normal to feel concerned or confused.
The good news is that most of these changes are not cancer and are often mild or temporary. In many cases, they are linked to common infections such as HPV and can resolve on their own without treatment.
Understanding what these results mean is the first step toward making informed decisions about your health.
In this article, we will explain what epithelial cell abnormalities are, what causes them, how serious they can be, and what steps you should take next.
What Is an Epithelial Cell Abnormality?
An epithelial cell abnormality refers to changes in the shape, size, or appearance of cells collected from the cervix during a Pap smear. These cells line the cervix, which is the lower part of the uterus that opens into the vagina.
In simple terms, it means that some cervical cells look different than expected under a microscope.
These changes are quite common and are often caused by temporary factors such as infections, inflammation, or hormonal changes. In many cases, they are linked to human papillomavirus (HPV), a very common virus that usually clears on its own.
Importantly, an epithelial cell abnormality does not mean cancer. It simply indicates that further monitoring or additional tests may be needed to better understand the cause.
During analysis, laboratories use a standardized system called the Bethesda System to classify these changes. This system helps healthcare providers determine how significant the abnormality is and what steps should be taken next.
Epithelial cell abnormalities are generally divided into two main categories:
- Squamous cell abnormalities
These affect the thin, flat cells that cover the outer surface of the cervix and are the most common type. - Glandular cell abnormalities
These involve mucus-producing cells located higher in the cervical canal and may require closer evaluation.
Types of Epithelial Cell Abnormalities
The Bethesda System is a standardized method used to classify cervical cell changes found during a Pap smear. It helps determine how significant the abnormality is and what follow-up steps may be needed.
Quick Overview of Abnormalities
| Type | Meaning | Risk Level |
|---|---|---|
| ASC-US | Mild unclear changes | Low |
| ASC-H | Possible high-grade changes | Moderate |
| LSIL | Mild HPV-related changes | Low |
| HSIL | Precancerous changes | High |
| AGC | Glandular cell changes | Moderate–High |
| AIS | Precancerous glandular lesion | High |
| Carcinoma | Cancerous cells present | Very High |
Squamous Cell Abnormalities
These affect the thin, flat cells on the surface of the cervix and are the most common findings.
Atypical Squamous Cells (ASC)
This is the most frequent abnormal result and is divided into two types:
- ASC-US (Atypical Squamous Cells of Undetermined Significance)
Cells appear slightly abnormal, but the cause is unclear. Most cases are mild and often linked to temporary HPV infection. - ASC-H (Atypical Squamous Cells – Cannot Exclude HSIL)
More concerning changes that may indicate a high-grade lesion and usually require further testing such as colposcopy.
LSIL (Low-grade Squamous Intraepithelial Lesion)
LSIL represents mild cell changes, typically caused by active HPV infection. These abnormalities often resolve on their own, especially in younger individuals, but follow-up is still recommended.
HSIL (High-grade Squamous Intraepithelial Lesion)
HSIL indicates more serious abnormalities involving moderate to severe dysplasia. These changes are associated with high-risk HPV types and have a greater chance of progressing if not treated.
Squamous Cell Carcinoma
This rare result indicates the presence of cancerous cells in the cervix. Immediate medical evaluation and treatment are required. Regular screening usually detects abnormalities before reaching this stage.
Glandular Cell Abnormalities
These affect mucus-producing cells located inside the cervical canal and are less common but may require more thorough evaluation.
Atypical Glandular Cells (AGC)
AGC indicates abnormal glandular cells that may be linked to precancerous changes in the cervix or abnormalities in the uterine lining. Further testing is usually needed.
Adenocarcinoma in Situ (AIS)
AIS refers to precancerous glandular changes. These lesions are typically found in the cervical canal and require careful management.
Adenocarcinoma
This is a form of invasive glandular cancer. Although less common than squamous cancer, it can be harder to detect early.
What This Means for You
Not all epithelial cell abnormalities carry the same level of risk. Many are mild and temporary, especially those related to HPV infections, and may resolve without treatment.
However, some abnormalities require closer monitoring or medical intervention. This is why following your doctor’s recommendations and attending follow-up appointments is essential.
What Happens Next After Each Result?
If your Pap smear shows epithelial cell abnormalities, the next steps depend on the type and severity of the changes. In many cases, no immediate treatment is needed, but follow-up is important to monitor your cervical health.
Here is what typically happens for each type of result:
ASC-US (Atypical Squamous Cells of Undetermined Significance)
- Usually considered low risk
- Your doctor may recommend:
- Repeat Pap smear in 1 year
- HPV testing to check for high-risk types
In many cases, these changes resolve on their own without treatment.
ASC-H (Cannot Exclude HSIL)
- More concerning than ASC-US
- Typically requires:
- Colposcopy (closer examination of the cervix)
This helps determine whether high-grade changes are present.
LSIL (Low-grade Squamous Intraepithelial Lesion)
- Often linked to HPV infection
- Common next steps:
- Monitoring with repeat testing
- Colposcopy in some cases
Many LSIL cases regress naturally, especially in younger individuals.
HSIL (High-grade Squamous Intraepithelial Lesion)
- Higher risk of progression if untreated
- Requires further evaluation:
- Colposcopy
- Biopsy
- Possible removal of abnormal cells (e.g., LEEP procedure)
Early treatment is highly effective in preventing cancer.
AGC (Atypical Glandular Cells)
- Less common but requires careful evaluation
- Your doctor may recommend:
- Colposcopy
- Endometrial sampling
This is to rule out abnormalities in both the cervix and uterus.
AIS (Adenocarcinoma in Situ)
- Precancerous glandular condition
- Typically managed with:
- Surgical removal of abnormal tissue
- Close follow-up
Early intervention is important.
Carcinoma (Cancerous Cells)
- Indicates the presence of cancer
- Requires immediate referral to a specialist
- Treatment may include:
- Surgery
- Radiation therapy
- Chemotherapy
Early detection significantly improves outcomes.
Maintaining a healthy vaginal microbiome may be part of a broader wellness approach. Some women choose probiotics specifically formulated for vaginal health to support microbial balance.
- Balances yeast & bacteria to maintain feminine health
- One capsule taken orally daily is enough
- Helps maintain vaginal flora in a normal range
Causes of Epithelial Cell Abnormalities
1. Human Papillomavirus (HPV) Infection
The most common cause of epithelial cell abnormalities is infection with HPV, particularly high-risk types such as HPV-16 and HPV-18. HPV is a very common sexually transmitted virus, and in many cases, the body clears it naturally. However, persistent infection with high-risk strains can lead to pre-cancerous changes in cervical cells.
2. Cervical Inflammation or Infection
Non-viral infections such as:
- Bacterial vaginosis
- Candida (yeast infections)
- Chlamydia
- Trichomoniasis
can also cause epithelial cells to appear abnormal on cytological analysis. In these cases, treatment of the infection often leads to resolution of the abnormal cells.
3. Hormonal Changes
Changes related to pregnancy, menopause, or use of hormonal contraceptives may affect the cervix’s epithelial lining. For example, atrophic changes in postmenopausal women can mimic abnormalities.
4. Recent Sexual Activity or Trauma
Sexual intercourse or the use of tampons, douches, or cervical procedures (e.g., biopsy or colposcopy) shortly before a Pap smear can sometimes cause transient reactive changes in epithelial cells.
5. Smoking
Tobacco use is a known co-factor in cervical dysplasia and impairs the immune system’s ability to clear HPV infections. It is also directly mutagenic to cervical epithelial cells.
6. Weakened Immune System
Individuals with immunosuppression—due to conditions such as HIV/AIDS or immunosuppressive therapy (e.g., after organ transplantation)—are at higher risk for persistent HPV infections and abnormal cervical cell changes.
Supporting your immune system plays an important role in how the body responds to viral infections. Some people choose to include vitamin D3 supplements as part of their daily routine to maintain immune function.
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7. Long-term HPV Infection Progressing Toward Neoplasia
When HPV infection persists and escapes immune clearance, it may lead to progressive changes known as cervical intraepithelial neoplasia (CIN)—a precursor to cervical cancer.
Diagnosis and Follow-Up Steps
1. Repeat Pap Smear
For minor abnormalities like ASC-US, especially in younger women, a repeat Pap test after 6–12 months is often the first step.
In some cases, your doctor may recommend additional HPV testing. For those who prefer privacy or convenience, at-home HPV testing kits are also available and can help you take the next step from home.
- PRIVATE AND SIMPLE SAMPLE COLLECTION: This kit allows you to collect your sample at home, using easy-to-follow instructi…
- CLEAR AND UNDERSTANDABLE RESULTS: Once your sample is processed, you’ll receive results that are simple to interpret, gi…
- LAB-BASED TESTING FOR ACCURACY: Your sample is analyzed in a CLIA-certified laboratory that follows rigorous testing sta…
2. HPV DNA Testing
Testing for high-risk HPV strains (especially HPV-16 and HPV-18) helps stratify risk:
- If HPV is negative, the abnormality may not require immediate action.
- If HPV is positive, further evaluation (like colposcopy) is usually recommended.
3. Colposcopy
A colposcopy is a detailed examination of the cervix using a magnifying instrument to identify suspicious areas. It may involve:
- Applying acetic acid to highlight abnormal tissues
- Taking targeted biopsies for histological analysis
This step is commonly done for ASC-H, LSIL, HSIL, or any abnormal Pap smear with a positive HPV test.
4. Cervical Biopsy
If abnormal areas are seen during colposcopy, a biopsy is performed to confirm the histological grade of the lesion (e.g., CIN 1, 2, or 3). This helps guide treatment decisions.
5. Endocervical Curettage (ECC)
In some cases—especially when glandular abnormalities or AIS are suspected—ECC is used to sample tissue from the endocervical canal to detect hidden lesions.
7. Long-Term Follow-Up
After treatment or clearance of the abnormality, follow-up may include:
- Pap and HPV co-testing at 12 and 24 months
- Return to regular screening if tests are normal
Early follow-up and management prevent progression to cervical cancer in most cases. That’s why adherence to screening guidelines and appropriate evaluation of any abnormal result is so important for maintaining cervical health.
FAQs
In most cases, epithelial cell abnormalities are not serious and do not mean cancer. They are often mild changes that can resolve on their own, but some cases require follow-up to rule out more significant conditions.
Treatment depends on the severity. Mild changes may only require monitoring, while more significant abnormalities may need procedures such as colposcopy, biopsy, or removal of abnormal cells.
Yes, abnormal epithelial cells can sometimes become cancerous if left untreated, but most abnormalities are precancerous and can be managed effectively when detected early.
Common warning signs include abnormal vaginal bleeding, pelvic pain, pain during intercourse, unusual vaginal discharge, and bleeding after intercourse.
References
- World Health Organization (WHO). Cervical cancer screening. Available at: https://www.who.int/news-room/fact-sheets/detail/cervical-cancer
- National Cancer Institute (NCI). Pap and HPV Testing. Available at: https://www.cancer.gov/types/cervical/pap-hpv-testing-fact-sheet
- American College of Obstetricians and Gynecologists (ACOG). Practice Bulletin: Cervical Cancer Screening and Prevention. Available at: https://www.acog.org/clinical/clinical-guidance/practice-advisory/articles/2021/04/updated-cervical-cancer-screening-guidelines
- U.S. Preventive Services Task Force (USPSTF). Cervical Cancer: Screening Recommendation. Available at: https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/cervical-cancer-screening
- Nayar R, Wilbur DC. The Bethesda System for Reporting Cervical Cytology: Definitions, Criteria, and Explanatory Notes. Springer; 2015.
Medical Disclaimer: This content is for informational and educational purposes only and does not constitute medical advice. It is not intended to replace professional medical consultation, diagnosis, or treatment. Always seek the advice of a qualified healthcare provider with any questions regarding a medical condition.
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