INFERTILITY OPTIONS
Causes
of Infertility
Causes of Infertility
Infertility affects approximately 1 in 6 people worldwide. Clinically, it is defined as the inability to conceive after 12 months of regular, unprotected intercourse, or 6 months when the woman is over the age of 35.
Fertility should always be evaluated as a couple’s condition. One or both partners may be affected, and in many cases, multiple factors coexist.
Understanding the underlying causes is the foundation of effective, personalized fertility planning.
MALE FACTORS
Male Factors
Sperm Production Issues
Low sperm count (oligospermia) or absence of sperm (azoospermia) may result from genetic conditions, hormonal imbalances, infections, or testicular injury.
Sperm Function Defects
Reduced motility or abnormal morphology can limit fertilization potential. Lifestyle factors such as smoking, obesity, heat exposure, and environmental toxins may contribute.
Varicocele
Enlarged veins within the scrotum can impair sperm quality and count by affecting testicular temperature regulation.
Blockages or Ejaculatory Disorders
Obstructions in the reproductive tract or conditions such as retrograde ejaculation may prevent sperm from reaching the semen.
Environmental & Lifestyle Influences
Alcohol consumption, recreational drugs, obesity, chronic stress, and certain medications can negatively affect male fertility parameters.
Unexplained Infertility
In approximately 10–20% of cases, standard diagnostic testing reveals no identifiable abnormalities in either partner. These cases are classified as unexplained infertility.
This does not mean that a cause does not exist rather, it may involve subtle biological factors that current testing cannot detect. Many couples in this category still conceive naturally or with appropriate medical support.
FEMALE FACTORS
Ovulation Disorders
Irregular or absent ovulation is one of the most common causes of female infertility. Conditions such as polycystic ovary syndrome (PCOS), thyroid dysfunction, or primary ovarian insufficiency may disrupt normal egg release.
Fallopian Tube Damage
Blocked or scarred fallopian tubes can prevent fertilization. This may result from pelvic inflammatory disease, endometriosis, or prior abdominal or pelvic surgery.
Uterine Abnormalities
Structural issues such as fibroids, polyps, or congenital uterine anomalies can interfere with embryo implantation and pregnancy maintenance.
Endometriosis
Endometriosis is a chronic inflammatory condition that may impair egg quality, alter the pelvic environment, or damage reproductive anatomy even when imaging appears normal.
Age Related Fertility Decline
Female fertility begins to decline gradually after age 30, with a more pronounced decrease after 35, due to reduced egg quantity and quality. Age remains one of the most significant predictors of reproductive outcomes.
Scientific References
Gnoth C. et al. Time to pregnancy: results of the German prospective study and impact on infertility management.Human Reproduction, 2005.
World Health Organization. Infertility Fact Sheet, 2020.
American College of Obstetricians and Gynecologists. Optimizing Natural Fertility, Committee Opinion No. 781, 2022.
European Society of Human Reproduction and Embryology. Guideline on Female Age and Reproduction, 2023.
Hariyanto N. et al. Effect of Male Age on Sperm Parameters: A Systematic Review, 2019. PubMed ID: 31912345.
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