6 Main Causes of Male Infertility

28 de octubre de 2025

1 min de lectura

Despite stereotypes that suggest the main responsibility for conception lies with the woman, the man plays a key role in one-third of infertility cases. What are the problems that most often arise for men?

Puntos clave

Despite stereotypes that suggest the main responsibility for conception lies with the woman, the man plays a key role in one-third of infertility cases.
Decrease in the number and quality of spermatozoa
Difficulties with sperm movement

Para quién es

Personas que exploran Salud masculina a través de la salud del hombre, infertilidad.

Por qué importa

Este artículo te ayuda a orientarte rápidamente y luego avanzar a una colección o serie si quieres seguir profundizando.

Autor del artículo

Dr. Paul

Urólogo

Decrease in the number and quality of spermatozoa

The most common cause of deterioration in sperm quality is varicocele, which are varicose veins surrounding the spermatic cord. As a result of impaired blood flow in the scrotum, the temperature rises, which negatively affects sperm production. Additionally, the quality and quantity of sperm can be affected by infections, frequent trips to the bath or sauna, hot showers or baths, and wearing tight underwear.

A normal sperm count is more than 15 million sperm per milliliter of semen or more than 39 million sperm per ejaculate.

Difficulties with sperm movement

The passage of sperm can be impeded by scarring caused by sexually transmitted diseases and testicular inflammation.

Hormonal imbalance

Infertility can be caused by abnormalities in the testicles themselves, as well as abnormalities affecting the entire hormonal system. This results in a drop in testosterone levels and other problems.

Problems with ejaculation

Retrograde ejaculation occurs when seminal fluid goes into the bladder during orgasm. It can be caused by a variety of conditions including diabetes, spinal cord injury, medication, and surgery of the bladder, prostate, or urethra.

Blockage of the tubules

The tubules that transport sperm can be blocked for a variety of reasons, including unintentional damage during surgery, infection, trauma, or developmental abnormalities. Blockage can occur at any level.

Taking anabolics

This is especially relevant for bodybuilders, as the use of anabolic drugs containing testosterone can lead to a reduction in testicular size. By getting extra testosterone artificially, the body stops producing its own, resulting in a decrease in the quantity and quality of sperm.

If a man has been having regular sexual intercourse for a year without protection, and conception does not occur, he should take a semen quality test and consult a urologist.

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