What causes male infertility?

Male infertility can be caused by problems with sperm production, sperm quality, sperm movement, sperm transport, hormones, or sexual function. Common causes include low sperm count, azoospermia, varicocele, hormonal disorders, infections, reproductive tract blockages, genetic conditions, certain medications, and lifestyle or environmental factors.

Male infertility can develop for many different reasons, and sometimes more than one factor may contribute to difficulty conceiving. Identifying the underlying cause is important because treatment depends on the specific problem.

1. Problems With Sperm Production

The testicles may not produce enough healthy sperm due to:

• Hormonal disorders.
• Testicular conditions.
• Previous testicular injury or surgery.
• Certain infections.
• Genetic conditions.
• Exposure to excessive heat or certain environmental factors.

Severely reduced sperm production may result in very low sperm count or azoospermia (no sperm in the semen).

2. Varicocele

A varicocele is an enlargement of the veins around the testicle. It can affect the testicular environment and may contribute to abnormal sperm production or quality in some men.

3. Hormonal Problems

Hormones play an important role in sperm production. Problems involving testosterone or other reproductive hormones can interfere with normal sperm production.

A urologist or andrologist may recommend hormone testing when clinically indicated.

4. Blockages in the Reproductive Tract

A man may produce sperm normally, but a blockage can prevent sperm from reaching the semen.

This can occur because of:

• Previous infections.
• Surgery.
• Injury.
• Congenital abnormalities.

These cases are sometimes referred to as obstructive azoospermia when no sperm are found in the semen because of an obstruction.

5. Genetic Causes

Certain genetic conditions can affect sperm production or the development of the male reproductive system. Genetic testing may be recommended in selected men, particularly when sperm counts are extremely low or sperm are completely absent.

6. Infections and Inflammation

Some infections involving the reproductive system may affect sperm production, sperm quality, or sperm transport.

7. Sexual or Ejaculatory Problems

Difficulty achieving or maintaining an erection, problems with ejaculation, or retrograde ejaculation can interfere with the delivery of sperm during intercourse.

8. Lifestyle and Environmental Factors

Certain lifestyle factors may negatively affect sperm health, including:

• Smoking.
• Excessive alcohol consumption.
• Obesity.
• Poor sleep.
• Physical inactivity.
• Exposure to excessive heat.
• Certain environmental or occupational exposures.

Improving these factors may support overall reproductive health, although lifestyle changes alone may not correct every cause of infertility.

Can the cause of male infertility be identified?

Often, yes—but not always.

A detailed evaluation usually begins with a semen analysis, medical and reproductive history, and physical examination. Depending on the findings, your doctor may recommend hormone tests, ultrasound, genetic testing, or additional investigations.

SCI International Hospital 

At SCI International Hospital, New Delhi, Dr. Vishal Dutt Gour, Senior Consultant Urologist and Andrologist, evaluates men with infertility using a comprehensive approach to identify possible causes such as low sperm count, azoospermia, varicocele, hormonal problems, and reproductive tract abnormalities. Based on the underlying cause, he develops an individualized treatment plan that may include medical management, surgery, or advanced sperm retrieval procedures when appropriate.