What Causes Female Infertility?
Female infertility can result from a variety of factors affecting ovulation, hormone balance, the fallopian tubes, the uterus, or egg quality. In many cases, more than one factor may be involved.
According to the World Health Organization (WHO), the most common identifiable causes of female infertility include ovulatory disorders, endometriosis, pelvic adhesions, tubal blockage, uterine abnormalities, and hormonal conditions such as hyperprolactinemia.
Because infertility is often multifactorial, a comprehensive evaluation is essential to identify the underlying cause and guide treatment.
Ovulatory Disorders (Including PCOS/PMOS)
Ovulatory disorders are the most common cause of female infertility, affecting roughly one in four cases.
These conditions occur when the ovaries do not release an egg regularly or fail to ovulate altogether. Without ovulation, pregnancy cannot occur because there is no egg available for fertilization.
One of the most common ovulatory disorders is Polycystic Ovary Syndrome/Polyendocrine Metabolic Ovarian Syndrome (PCOS/PMOS), which affects up to 20% of women of reproductive age. PCOS (PMOS) is a hormonal condition that disrupts ovulation and can also impact egg quality. Other causes include hypothalamic dysfunction and primary ovarian insufficiency.
Blocked Fallopian Tubes (Tubal Factor Infertility)
Tubal factor infertility occurs when one or both fallopian tubes are partially or completely blocked.
The fallopian tubes are where fertilization normally occurs, so any blockage can prevent sperm from reaching the egg or stop a fertilized embryo from reaching the uterus.
Common causes include pelvic inflammatory disease, prior infections such as chlamydia or gonorrhea, endometriosis, previous abdominal or pelvic surgery, or hydrosalpinx, a condition where fluid collects in a damaged tube. Tubal damage may also increase the risk of ectopic pregnancy.
Endometriosis and Female Fertility
Endometriosis affects about 15% of women with infertility and occurs when tissue similar to the uterine lining grows outside the uterus.
This condition can impact female fertility in several ways. It may cause inflammation, scarring, or adhesions that distort the reproductive organs. In more advanced cases, it can block the fallopian tubes or interfere with egg quality and embryo implantation.
Because symptoms vary widely, endometriosis can sometimes go undiagnosed until fertility testing is performed.
Pelvic Adhesions and Scar Tissue
Pelvic adhesions are bands of scar tissue that form after infection, surgery, appendicitis, or inflammatory conditions such as endometriosis.
These adhesions can cause reproductive organs to stick together, interfering with normal ovarian and fallopian tube function. This can make it more difficult for the egg and sperm to meet or for an embryo to reach the uterus.
Uterine Abnormalities, Fibroids, and Polyps
Structural conditions affecting the uterus can also contribute to female infertility.
These may include uterine fibroids, endometrial polyps, congenital uterine abnormalities, or scar tissue inside the uterus. Polyps are particularly common and are found in a significant percentage of women experiencing infertility.
Depending on their size and location, these conditions may interfere with embryo implantation or distort the uterine cavity, making pregnancy more difficult.
Hyperprolactinemia and Hormonal Imbalance
Hyperprolactinemia occurs when the pituitary gland produces excessive amounts of prolactin, a hormone involved in reproductive regulation.
Elevated prolactin levels can disrupt ovulation, leading to irregular or absent menstrual cycles and reduced fertility. In many cases, this condition can be effectively treated with medication once diagnosed.
How Age Affects Female Fertility
Age is one of the most important factors in female fertility. Women are born with a finite number of eggs, and both the quantity and quality decline over time.
In the early 20s, most eggs are chromosomally normal. By the early 30s, egg quality starts to decline gradually. After age 35, the decline becomes more significant, and by the 40s, a much smaller percentage of eggs are genetically normal.
As egg quality decreases, the chances of conception naturally decline while the risk of miscarriage increases.
Lifestyle and Environmental Factors
Lifestyle factors can also influence female fertility. Weight, nutrition, exercise habits, stress levels, and exposure to toxins all play a role in reproductive health.
Both underweight and overweight conditions can disrupt ovulation. Smoking, alcohol use, and drug exposure have also been shown to negatively impact egg quality and overall fertility. In some cases, improving lifestyle factors can significantly improve the chances of conception.
When to Seek Fertility Evaluation for Female Infertility
A fertility evaluation is generally recommended if pregnancy has not occurred after 12 months of trying, or after 6 months if the woman is over age 35.
Earlier female infertility evaluation may be appropriate if there are known risk factors such as irregular cycles, suspected endometriosis, prior pelvic infections, or a history of reproductive surgery.
Why Choose Positive Steps Fertility in Mississippi and Louisiana?
At Positive Steps Fertility, we take a comprehensive approach to identifying the causes of female infertility. Our female infertility evaluation process is designed to uncover underlying conditions such as ovulatory disorders, tubal disease, endometriosis, and uterine abnormalities.
We offer advanced diagnostic tools, including the patented Parryscope® female fertility assessment, along with individualized fertility treatment plans that may include medication, surgical options, IUI, or IVF depending on the diagnosis.
Our goal is to help patients move from uncertainty to clarity with a positive path forward.
Frequently Asked Questions About Female Infertility Causes
What is the most common cause of female infertility?
Ovulatory disorders, including PCOS (PMOS), are the most common cause of female infertility.
Can you still get pregnant with blocked fallopian tubes?
Natural pregnancy is difficult if both tubes are blocked, but fertility treatment options such as surgery or IVF may still make pregnancy possible.
Does endometriosis always cause female infertility?
No. Many women with endometriosis conceive naturally, but moderate to severe cases can interfere with fertility.
How does PCOS (PMOS) affect female fertility?
PCOS/PMOS disrupts hormone balance and ovulation, making it difficult to release a mature egg each month.
Can female infertility have more than one cause?
Yes. Many patients have multiple contributing factors, which is why full female fertility evaluation is important.
Does age really affect female fertility that much?
Yes. Egg quality and quantity decline with age, particularly after age 35, which significantly impacts female fertility.
Can lifestyle changes improve female fertility?
In some cases, yes. Improvements in weight, nutrition, and lifestyle habits can positively influence ovulation and female reproductive health.
