Causes of male infertility

Male infertility has many causes--from hormonal imbalances, to physical problems, to psychological and/or behavioral problems. Moreover, fertility reflects a man’s “overall” health. Men who live a healthy lifestyle are more likely to produce healthy sperm. The following list highlights some lifestyle choices that negatively impact male fertility--it is not all-inclusive:

  • Smoking--significantly decreases both sperm count and sperm cell motility.
  • Prolonged use of marijuana and other recreational drugs.
  • Chronic alcohol abuse.
  • Anabolic steroid use--causes testicular shrinkage and infertility.
  • Overly intense exercise--produces high levels of adrenal steroid hormones which cause a testosterone deficiency resulting in infertility.
  • Inadequate vitamin C and Zinc in the diet.
  • Tight underwear--increases scrotal temperature which results in decreased sperm production.
  • Exposure to environmental hazards and toxins such as pesticides, lead, paint, radiation, radioactive substances, mercury, benzene, boron, and heavy metals
  • Malnutrition and anemia.
  • Excessive stress!


Modifying these behaviors can improve a man’s fertility and should be considered when a couple is trying to achieve pregnancy.


Hormonal problems

A small percentage of male infertility is caused by hormonal problems. The hypothalamus-pituitary endocrine system regulates the chain of hormonal events that enables testes to produce and effectively disseminate sperm. Several things can go wrong with the hypothalamus-pituitary endocrine system:

  • The brain can fail to release gonadotrophic-releasing hormone (GnRH) properly. GnRH stimulates the hormonal pathway that causes testosterone synthesis and sperm production. A disruption in GnRH release leads to a lack of testosterone and a cessation in sperm production.
  • The pituitary can fail to produce enough lutenizing hormone (LH) and follicle stimulating hormone
  • (FSH) to stimulate the testes and testosterone/sperm production. LH and FSH are intermediates
  • in the hormonal pathway responsible for testosterone and sperm production.
  • The testes’ Leydig cells may not produce testosterone in response to LH stimulation.
  • A male may produce other hormones and chemical compounds which interfere with the sex-hormone balance.


The following is a list of hormonal disorders which can disrupt male infertility:

Elevated prolactin--a hormone associated with nursing mothers, is found in 10 to 40 percent of infertile males. Mild elevation of prolactin levels produces no symptoms, but greater elevations of the hormone reduces sperm production, reduces libido and may cause impotence. This condition responds well to the drug Parlodel (bromocriptine).

Low thyroid hormone levels--can cause poor semen quality, poor testicular function and may disturb libido. May be caused by a diet high in iodine. Reducing iodine intake or beginning thyroid hormone replacement therapy can elevate sperm count. This condition is found in only 1 percent of infertile men.

Congenital Adrenal Hyperplasia:
Occurs when the pituitary is suppressed by increased levels of adrenal androgens. Symptoms include low sperm count, an increased number of immature sperm cells, and low sperm cell motility. Is treated with cortisone replacement therapy. This condition is found in only 1 percent of infertile men.

Hypogonadotropic Hypopituitarism:
Low pituitary gland output of LH and FSH. This condition arrests sperm development and causes the progressive loss of germ cells from the testes and causes the seminiferous tubules and Leydig (testosterone producing) cells to deteriorate. May be treated with the drug Serophene. However, if all germ cells are destroyed before treatment commences, the male may be permanently infertile.

Complete pituitary gland failure--lowers growth hormone, thyroid-stimulating hormone, and LH and FSH levels. Symptoms include: lethargy, impotence, decreased libido, loss of secondary sex characteristics, and normal or undersized testicles. Supplementing the missing pituitary hormones may restore vigor and a hormone called hCG may stimulate testosterone and sperm production.

Physical problems

A variety of physical problems can cause male infertility. These problems either interfere with the sperm production process or disrupt the pathway down which sperm travel from the testes to the tip of the penis. These problems are usually characterized by a low sperm count and/or abnormal sperm morphology. The following is a list of the most common physical problems that cause male infertility:

A varicocele is an enlargement of the internal spermatic veins that drain blood from the testicle to the abdomen (back to the heart) and are present in 15% of the general male population and 40% of infertile men. These images show what a variocoele looks like externally and internally.

A varicocele develops when the one way valves in these spermatic veins are damaged causing an abnormal back flow of blood from the abdomen into the scrotum creating a hostile environment for sperm development. Varicocoeles may cause reduced sperm count and abnormal sperm morphology which cause infertility. Variococles can usually be diagnosed by a physical examination of the scrotum which can be aided by the Doppler stethoscope and scrotal ultrasound. Varicocoele can be treated in many ways (see treatment section), but the most successful treatments involve corrective surgery.

Damaged Sperm Ducts:
Seven percent of infertile men cannot transport sperm from their testicles to out of their penis. This pathway may be blocked by a number of conditions:

  • A genetic or developmental mistake may block or cause the absence of one or both tubes (which transport the sperm from the testes to the penis).
  • Scarring from tuberculosis or some STDs may block the epididymis or tubes.
  • An elective or accidental vasectomy may interrupt tube continuity.


Is a common problem affecting fertility that is caused by a supportive tissue abnormality which allows the testes to twist inside the scrotum which is characterized by extreme swelling. Torsion pinches the blood vessels that feed the testes shut which causes testicular damage. If emergency surgery is not performed to untwist the testes, torsion can seriously impair fertility and cause permanent infertility if both testes twist.

Infection and Disease:
Mumps, tuberculosis, brucellosis, gonorrhea, typhoid, influenza, smallpox, and syphilis can cause testicular atrophy. A low sperm count and low sperm motility are indicators of this condition. Also, elevated FSH levels and other hormonal problems are indicative of testicular damage. Some STDs like gonorrhea and chlamydia can cause infertility by blocking the epididimis or tubes. These conditions are usually treated by hormonal replacement therapy and surgery in the case of tubular blockage.

Klinefelter’s Syndrome:
Is a genetic condition in which each cell in the human body has an additional X chromosome--men with Klinefelter’s Syndrome have one Y and two X chromosomes. Physical symptoms include peanut-sized testicles and enlarged breasts. A chromosome analysis is used to confirm this analysis. If this condition is treated in its early stages (with the drug hCG), sperm production may commence and/or improve. However, Klinefelter’s Syndrome eventually causes all active testicular structures to atrophy. Once testicular failure has occurred, improving fertility is impossible.

Retrograde Ejaculation:
Is a condition in which semen is ejaculated into the bladder rather than out through the urethra because the bladder sphincter does not close during ejaculation. If this disorder is present, ejaculate volume is small and urine may be cloudy after ejaculation. This condition affects 1.5 percent of infertile men and may be controlled by medications like decongestants which contract the bladder sphincter or surgical reconstruction of the bladder neck can restore normal ejaculation.


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