Infertility: Causes, Diagnosis and Treatment
Infertility is the inability to achieve a pregnancy after 12 months of regular unprotected intercourse. It can affect both women and men and has many possible causes.
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Infertility is the inability to achieve a pregnancy after 12 months of regular unprotected intercourse. It can affect both women and men and has many possible causes.
What is Infertility?
Infertility is defined as the failure to achieve a clinical pregnancy after 12 months or more of regular unprotected sexual intercourse. It is estimated to affect approximately one in six couples of reproductive age worldwide. Infertility can originate from female factors, male factors, a combination of both, or may remain unexplained after thorough investigation.
Causes
Female Causes
- Ovulation disorders: Hormonal imbalances such as polycystic ovary syndrome (PCOS) can prevent the release of a mature egg.
- Fallopian tube problems: Blockages or damage to the fallopian tubes, often caused by pelvic infections or endometriosis.
- Endometriosis: Growth of uterine-like tissue outside the uterus, which can impair fertility significantly.
- Uterine abnormalities: Fibroids, polyps, or congenital malformations of the uterus.
- Premature ovarian insufficiency: Early loss of normal ovarian function before age 40.
Male Causes
- Sperm quality issues: Low sperm count (oligospermia), poor sperm motility (asthenospermia), or abnormal sperm morphology (teratospermia).
- Hormonal disorders: Deficiencies in testosterone or other hormones regulating sperm production.
- Varicocele: Enlarged veins within the scrotum that can impair sperm production and quality.
- Genetic factors: Chromosomal abnormalities such as Klinefelter syndrome.
- Obstructive azoospermia: Blockage or absence of the vas deferens preventing sperm from being ejaculated.
Shared Risk Factors
- Advancing age (especially for women over 35)
- Smoking and excessive alcohol consumption
- Being overweight or significantly underweight
- Chronic stress and psychological burden
- Certain medications and chemotherapy
- Sexually transmitted infections (e.g., chlamydia)
Symptoms
Infertility itself typically does not cause obvious physical symptoms. The primary indicator is the inability to conceive despite regular intercourse. In women, associated symptoms may include irregular or absent menstrual cycles, pelvic pain, or signs of endometriosis. In men, changes in sexual function or testicular discomfort may point to underlying causes.
Diagnosis
Diagnosing infertility involves a thorough medical history of both partners along with targeted investigations:
- In women: Blood hormone tests, ultrasound of the ovaries and uterus, hysterosalpingography (X-ray of the fallopian tubes), and in some cases laparoscopy.
- In men: Semen analysis (evaluating sperm count, motility, and morphology), hormone blood tests, scrotal ultrasound, and genetic testing if indicated.
The diagnosis is typically established after one year of regular unprotected intercourse without conception, or sooner when risk factors are already known.
Treatment
Medical Therapy
Hormonal treatments can stimulate ovulation in women using medications such as clomiphene citrate or gonadotropins. In men, hormonal therapies may help improve sperm production in selected cases.
Surgical Interventions
Blocked fallopian tubes, uterine fibroids, polyps, or a varicocele in men can be surgically corrected to improve the chances of natural conception.
Assisted Reproductive Technologies (ART)
- Intrauterine insemination (IUI): Prepared sperm are placed directly into the uterus around the time of ovulation.
- In vitro fertilization (IVF): Eggs are fertilized outside the body and the resulting embryo is transferred into the uterus.
- Intracytoplasmic sperm injection (ICSI): A single sperm is injected directly into an egg, particularly useful in cases of severe male infertility.
- Egg donation and sperm donation: Used when the own eggs or sperm are not viable.
Lifestyle Modifications
Achieving a healthy body weight, quitting smoking, reducing alcohol intake, managing stress, and maintaining a balanced diet can positively influence fertility and improve treatment outcomes.
Psychological Support
The emotional burden of infertility can be significant. Psychological counseling or support groups can help couples cope with the stress and grief associated with fertility challenges.
References
- World Health Organization (WHO): Infertility. Geneva, 2023. Available at: https://www.who.int/news-room/fact-sheets/detail/infertility
- Practice Committee of the American Society for Reproductive Medicine: Definitions of infertility and recurrent pregnancy loss. Fertility and Sterility, 99(1): 63, 2013.
- Zegers-Hochschild F et al. - The International Glossary on Infertility and Fertility Care, 2017. Human Reproduction, 32(9): 1786-1801.
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