Epidemiology and clinical significance

 Male infertility is one of the most common clinical issues in reproductive medicine. According to World Health Organization data, the male factor is solely or partially responsible for infertility in 40 to 50% of couples facing conception difficulties. Despite this statistic, male infertility remains underdiagnosed, as men seek medical help less frequently than women.

Understanding the biological mechanisms governing male reproductive function is fundamental for early diagnosis and effective treatment.

Pathophysiology of male infertility

 Spermatogenesis is a complex biological process that depends on the integrity of the endocrine system, testicular health, and the absence of harmful environmental factors. Any disturbance at these levels can affect the number, motility, or morphology of spermatozoa, reducing the likelihood of natural fertilization.

A key pathophysiological mechanism that has been extensively studied is oxidative stress. The overproduction of reactive oxygen species causes damage to sperm DNA, reduces cell membrane fluidity, and negatively impacts their motility. Modern research estimates that oxidative stress contributes to infertility in 30 to 80% of clinical cases.

Etiological classification

The causes of male infertility are classically classified into three categories: pre-testicular, testicular, and post-testicular. In clinical practice, the most frequently identified factors are:

• Oligospermia Reduced sperm concentration below 16 million per milliliter, according to WHO revised criteria (2021). It is the most common anomaly parameter in semen analysis.
• Asthenospermia Reduced progressive sperm motility, which hinders penetration of the cervix and access to the oocyte.
• Teratospermia Increased percentage of morphologically abnormal spermatozoa, impacting fertilization capacity.
• Hormonal disorders Hypogonadism, hyperprolactinemia, or dysfunction of the hypothalamic-pituitary-testicular axis directly affect the regulation of spermatogenesis.
• Varicocele The most commonly recognized anatomical cause of male infertility, leading to an increase in intratesticular temperature and accumulation of toxic metabolites.
• Lifestyle and environmental factors Smoking, chronic alcohol consumption, obesity, exposure to endocrine disruptors, and chronic psychological stress have been associated with a significant reduction in sperm quality in population studies.

Diagnostic approach

Diagnostic investigation begins with semen analysis, which provides quantitative and qualitative information about spermatozoa. The examination evaluates sperm count, motility, morphology, ejaculate volume, and other clinically important parameters. Evaluation of two samples at least three weeks apart is recommended for reliable results.

At a later stage, the clinical andrologist may evaluate:

• Hormonal profile Measurement of FSH, LH, total and free testosterone, prolactin, and thyroid hormones.
• Scrotal ultrasound For detection of varicocele, testicular masses, or structural abnormalities.
• Genetic testing In cases of severe oligospermia or azoospermia, testing for Y chromosome mutations or Klinefelter syndrome is clinically necessary.

Therapeutic and supportive strategies

Lifestyle modification

There is strong evidence that lifestyle modification can measurably improve sperm parameters. Adopting a Mediterranean diet, rich in antioxidants and monounsaturated fatty acids, has been associated with improved motility and morphology. Regular moderate-intensity aerobic exercise improves insulin sensitivity and testosterone levels. Smoking cessation is a high-priority factor, given the direct genotoxic effect of tobacco on sperm DNA.

Role of micronutrients

Modern research has highlighted the documented role of specific micronutrients in male reproductive function:

• Zinc Essential for normal spermatogenesis and testosterone synthesis. Its deficiency has been associated with oligospermia and hypogonadism in multiple clinical studies.
• Selenium A structural component of glutathione peroxidase, a key antioxidant enzyme. Studies show improved sperm motility and morphology with its supplementary administration.
• Folic acid Involved in DNA synthesis and repair. In combination with zinc, it has shown a positive effect on sperm count in andrological studies.
• Vitamin C Water-soluble antioxidant found in high concentrations in seminal fluid. Protects sperm DNA from oxidative damage.
• Vitamin E Fat-soluble antioxidant that protects cell membranes from lipid peroxidation, maintaining the structural integrity of spermatozoa.

The supplementary administration of the above components does not replace medical treatment, but can act as a supportive measure within a comprehensive therapeutic approach.

Medical and surgical options

In cases of reversible etiology, such as varicocele, surgical correction has proven effective in improving sperm parameters. Hormonal disorders are treated medically under the guidance of an endocrinologist or andrologist. In cases of severe infertility, modern methods of assisted reproduction, such as intracytoplasmic sperm injection (ICSI), offer high success rates.

Conclusions

 Male infertility is a multifactorial clinical entity with documented causes and effective treatment options. Early diagnostic evaluation, lifestyle modification, targeted nutritional support with proven micronutrients, and appropriate medical treatment comprise a comprehensive strategy that can significantly improve the chances of conception.

Note: This article is for informational and scientific purposes only. It does not constitute medical advice and does not replace the opinion of a specialized physician. For any concerns regarding reproductive health, consult an andrologist or urologist.