Infertility is defined as a medical condition in which a couple of reproductive age fails to achieve a clinical pregnancy after at least 12 months of regular unprotected sexual intercourse. According to a report released by the World Health Organization (WHO) in 2023, approximately 17.5% of the global adult population—about 1 in 6 people—will experience infertility at some point in their lifetime.
Among these cases, female factors account for approximately 35%–40% of all infertility cases, male factors account for 30%–35%, and combined or unexplained factors account for 25%–30%.
Infertility is not a single disease but rather a reproductive dysfunction caused by abnormalities in multiple systems, including the reproductive, endocrine, and immune systems, as well as various potential factors such as environmental influences and lifestyle. Therefore, a comprehensive medical evaluation is required to identify the underlying causes before targeted interventions can be implemented.
Main Causes of Female Infertility
The causes of female infertility are complex and can generally be categorized into several major groups. The following data and explanations are based on statistics and interpretations from international authoritative institutions.
1. Ovulatory Disorders
Ovulatory disorders are one of the most common causes of female infertility, accounting for approximately 30%–40% of cases. Polycystic ovary syndrome (PCOS) is the leading contributor, with about 70% of patients experiencing ovulatory dysfunction and an infertility rate that can reach up to 70%. In addition, hypothalamic dysfunction and thyroid disorders may also disrupt the normal ovulatory cycle.
2. Fallopian Tube and Uterine Factors
Fallopian tube–related conditions account for approximately 30%–40% of female infertility cases. Pelvic inflammatory disease and endometriosis can lead to adhesions or blockages in the fallopian tubes, preventing sperm and egg from meeting. Structural abnormalities of the uterus, such as uterine fibroids and intrauterine adhesions, can directly affect embryo implantation and reduce the likelihood of successful pregnancy.
3. Endometriosis
Approximately 30% to 50% of women with endometriosis experience fertility challenges. Even with patent fallopian tubes, pelvic inflammation caused by ectopic endometrial tissue and damage to ovarian function can reduce the chances of conception. Even when the fallopian tubes remain open, pelvic inflammation and ovarian function impairment caused by ectopic endometrial tissue can significantly reduce the chances of conception.
Scientific Diagnosis and Stepwise Treatment Strategies
A systematic diagnostic and treatment approach is essential for addressing female infertility effectively.
1. Medical Evaluation Process
The evaluation typically begins with basic examinations, including medical history collection, ovulation monitoring, pelvic ultrasound, and hysterosalpingography (HSG) to assess the condition of the fallopian tubes and uterine cavity.
If necessary, further advanced examinations may be conducted, such as hormone testing, hysteroscopy, and laparoscopy, to obtain more detailed information about reproductive health and identify potential structural or hormonal abnormalities.
2. Stepwise Treatment Strategies
Treatment usually follows a stepwise approach based on the underlying cause of infertility.
Medication therapy is often used to induce ovulation in women with ovulatory disorders. When anatomical abnormalities are present, surgical treatment may be required to correct issues such as fallopian tube blockage, endometriosis, or uterine fibroids.
If these approaches are unsuccessful, assisted reproductive technologies may be recommended.
Assisted Reproductive Technologies
Assisted reproductive technologies (ART) play a crucial role in modern reproductive medicine and provide effective solutions for many cases of infertility.
1. Intrauterine Insemination (IUI)
Intrauterine insemination is commonly used for infertility caused by mild male factors, cervical factors, or unexplained infertility. The procedure involves placing specially prepared sperm directly into the uterus around the time of ovulation to increase the chances of fertilization.
2. In Vitro Fertilization and Embryo Transfer (IVF-ET)
In vitro fertilization and embryo transfer is widely used for infertility caused by fallopian tube factors, severe male factors, endometriosis, or cases in which other treatments have failed. In this process, eggs are fertilized with sperm outside the body to form embryos, which are then transferred into the uterine cavity. By bypassing the fallopian tubes and other potential barriers, IVF-ET can directly address multiple causes of female infertility.
Conclusion
Female infertility is a complex medical condition involving multiple systems and contributing factors. Through systematic medical evaluation to determine the underlying causes and by following a stepwise treatment strategy—from lifestyle adjustments and medication therapy to surgical treatment and assisted reproductive technologies—most cases of female infertility can be addressed effectively.
Among these approaches, assisted reproductive technologies represent a significant advancement in modern reproductive medicine. They provide practical and effective pathways for addressing female infertility and have helped many families around the world achieve their goal of having children.
Find out more about female fertility from ENERBABY.