Male Infertility: Causes, Signs, Symptoms, and Management -

What Is Male Infertility?

Male infertility is the inability of a man to achieve conception with a fertile female partner despite regular, unprotected sexual intercourse for at least 12 months. Male factors contribute to approximately half of all infertility cases globally, making it a significant reproductive health concern (Agarwal et al., 2021). Successful male fertility depends on the production of healthy sperm, adequate sperm count, normal sperm motility, proper sperm morphology, balanced reproductive hormones, and an unobstructed reproductive tract.

Major Causes of Male Infertility

1. Low Sperm Count (Oligozoospermia)

Low sperm count is one of the most common causes of male infertility. A reduced number of sperm in the semen decreases the likelihood that sperm will reach and fertilize an egg. This condition may result from hormonal disturbances, genetic factors, infections, nutritional deficiencies, or environmental exposures (Agarwal et al., 2021).

2. Poor Sperm Motility

Sperm motility refers to the ability of sperm to move efficiently through the female reproductive tract. Poor motility can significantly reduce the chances of fertilization. Oxidative stress, smoking, obesity, infections, and varicocele have all been associated with impaired sperm movement (Agarwal et al., 2021).

3. Abnormal Sperm Morphology

Sperm morphology describes the size and shape of sperm cells. Abnormal sperm structure may affect the sperm’s ability to penetrate and fertilize an egg. Genetic abnormalities, toxin exposure, smoking, and oxidative stress are common contributors to poor sperm morphology.

4. Varicocele

Varicocele is the enlargement of veins within the scrotum and is among the most common reversible causes of male infertility. Increased scrotal temperature and oxidative stress associated with varicocele may impair sperm production and quality. Studies have shown that treatment of clinically significant varicocele can improve semen parameters in selected men (Esteves et al., 2021).

5. Hormonal Imbalances

Normal sperm production requires adequate levels of testosterone, follicle-stimulating hormone (FSH), and luteinizing hormone (LH). Disorders affecting the testes, pituitary gland, hypothalamus, or thyroid gland can disrupt hormone production and impair fertility (Agarwal et al., 2021).

6. Infections of the Reproductive Tract

Infections such as epididymitis, orchitis, prostatitis, and certain sexually transmitted infections may interfere with sperm production or block sperm transport pathways. Chronic inflammation can also negatively affect sperm quality.

7. Genetic Factors

Certain genetic conditions, including Klinefelter syndrome and Y-chromosome microdeletions, can impair sperm production and are important causes of severe male infertility (Agarwal et al., 2021).

8. Lifestyle and Environmental Factors

Lifestyle habits play a major role in reproductive health. Smoking, excessive alcohol intake, obesity, chronic stress, inadequate sleep, and exposure to environmental pollutants have all been linked to poorer semen quality. A large systematic review reported a substantial global decline in sperm counts over recent decades, highlighting the impact of environmental and lifestyle factors on male fertility (Levine et al., 2023).

Major Signs and Symptoms of Male Infertility

Difficulty Achieving Pregnancy

The most common sign of male infertility is the inability to achieve pregnancy after one year of regular, unprotected intercourse. Many men have no other noticeable symptoms.

Erectile Dysfunction

Difficulty achieving or maintaining an erection may indicate underlying hormonal, vascular, or reproductive health issues that can affect fertility (Agarwal et al., 2021).

Reduced Libido

A decline in sexual desire may occur in men with low testosterone levels or other hormonal disorders that affect reproductive function.

Ejaculatory Problems

Delayed ejaculation, premature ejaculation, or reduced semen volume may be associated with reproductive tract abnormalities or hormonal imbalances.

Testicular Pain or Swelling

Pain, swelling, or a feeling of heaviness in the scrotum may suggest varicocele, infection, or other conditions affecting fertility.

Small Testicle Size

Smaller-than-normal testicles can indicate impaired sperm production or hormonal abnormalities that affect fertility.

Reduced Facial or Body Hair

Low testosterone levels may lead to decreased facial hair, body hair, and muscle mass, which can signal underlying endocrine disorders.

Recurrent Pregnancy Loss

Although less obvious, sperm DNA damage has been associated with recurrent pregnancy loss and reduced reproductive success in some couples (Agarwal et al., 2021).

How Can We Manage Male Infertility?

Management begins with identifying the underlying cause through medical evaluation, semen analysis, hormonal testing, and, when appropriate, genetic investigations. Lifestyle modifications are often the first step and may include maintaining a healthy body weight, exercising regularly, avoiding tobacco and excessive alcohol consumption, managing stress, and improving sleep quality.

Nutrition also plays an important role in reproductive health. Diets rich in fruits, vegetables, whole grains, legumes, nuts, fish, and healthy fats have been associated with better semen quality and fertility outcomes (Salas-Huetos et al., 2017). Adequate intake of nutrients such as zinc, selenium, folate, vitamins C and E, vitamin D, and omega-3 fatty acids may support sperm production and function.

Men with clinically significant varicocele may benefit from surgical correction, which has been shown to improve semen quality in selected cases (Esteves et al., 2021). Reproductive tract infections should be treated appropriately to reduce inflammation and prevent further damage. Hormonal disorders may require targeted medical therapy to restore normal reproductive function.

When natural conception remains difficult despite treatment, assisted reproductive technologies such as intrauterine insemination (IUI), in vitro fertilization (IVF), and intracytoplasmic sperm injection (ICSI) can improve the likelihood of successful pregnancy.

Bottom Line

Male infertility is a common reproductive health condition caused by factors such as low sperm count, poor sperm motility, abnormal sperm morphology, varicocele, hormonal disorders, infections, genetic abnormalities, and unhealthy lifestyle habits. Symptoms may include difficulty conceiving, erectile dysfunction, low libido, testicular abnormalities, and hormonal changes. Early diagnosis, lifestyle improvements, appropriate medical treatment, and assisted reproductive technologies can help many men improve fertility and achieve successful conception.

References

Written By: Shabina Khan (Clinical Pharmacist)

Medically Reviewed By: Dr. Prateek Sharma (Advisor Health & Wellness)