Infertility can occur even when menstrual cycles are regular and ovulation is taking place. While hormonal imbalances, blocked fallopian tubes and sperm-related concerns are commonly evaluated, certain conditions affecting the cervix may also contribute to difficulties with conception. This is known as cervical-factor infertility, this occurs when structural abnormalities or changes in the cervix interfere with the passage of sperm into the uterus.
Women with a history of cervical surgery, scarring or narrowing of the cervical opening may be particularly affected, says Dr Kalpana Jain, Fertility Specialist, Birla Fertility & IVF, Guwahati. Recognising these factors is important in determining whether further investigation or treatment is required.
What does the cervix have to do with conception?
The cervix is the lower, narrow part of the uterus that connects to the vagina. It produces cervical mucus, which changes in consistency throughout the menstrual cycle.
Around ovulation, rising oestrogen levels cause cervical mucus to become thinner, clearer and more slippery, creating favourable conditions for sperm to travel through the cervix towards the uterus and fallopian tubes. During other phases of the menstrual cycle, the mucus generally becomes thicker, making sperm passage more difficult.
These changes are a normal part of reproductive functioning. However, changes in cervical mucus alone cannot reliably determine fertility or establish the cause of difficulty conceiving.
Can a problem with the cervix affect pregnancy?
In some instances, scarring from procedures or cervical stenosis (an unusually narrow cervical opening) might make it hard for sperm to get through. Infections and inflammation can also affect cervical health.
Some women have no obvious symptoms. Others may experience unusual discharge, bleeding after intercourse, bleeding between periods or persistent pelvic discomfort. These symptoms can have several causes and do not necessarily lead to a fertility problem.
How would you know if your cervix needs attention?
There are no simple symptoms or home test that can establish cervical-factor infertility. A fertility specialist may review your medical history, ask about previous cervical procedures and recommend an examination or tests for infection, depending on your symptoms. The evaluation also considers other possible factors, including ovulation, fallopian tubes and sperm health, since conception difficulties may have more than one cause.
Routine cervical screening is also an important part of women’s reproductive healthcare. A Pap smear (cervical cytology test) can identify abnormal cells in the cervix that may require further evaluation. While a Pap smear does not diagnose infertility, its findings can help identify cervical abnormalities that need attention before proceeding with fertility treatment.
If a Pap smear reports high-grade squamous intraepithelial lesions (HSIL) or other concerning abnormalities, further evaluation by a gynaecological oncologist may be recommended. This may include colposcopy-guided biopsy to assess the abnormal area and determine the appropriate management. Where such findings are identified during fertility evaluation, the cervical abnormality should be assessed and managed as advised by the specialist before proceeding with embryo transfer. The timing of further fertility treatment will depend on the findings and the recommended management plan.
Does cervical-factor infertility mean you cannot conceive naturally?
Not necessarily. Treatment depends on what is causing the problem. If there is infection, medication may be needed. If there is significant narrowing or scarring, a procedure may be needed. Based on the findings, and the overall fertility of the couple, treatments such as intrauterine insemination (IUI) or IVF may be discussed.
If you’ve been trying to get pregnant without success, don’t assume that regular periods mean everything has been ruled out, or that the cervix must be the problem. A fertility consultation can help you understand what needs attention and if treatment is needed.