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How do sperm ducts get blocked? – Sperm Blockage Causes

We have talked about sperm ducts multiple times in our article, and one of our regular readers asked us how sperm ducts get blocked and what are sperm blockage causes?

Well, this is what this article is all about. In this article, we will take an in-depth look at this topic and tell you the main reason for sperm blockage. Now, if that sounds interesting to you then let us begin. 


Men can have a sufficient amount of sperm produced by their testicles. Still, they will not reproduce because of a plumbing issue that stops the sperm from moving out of the testicles and into the ejaculate in the urethra/penis.


Vasectomy: The most prevalent cause of obstructive azoospermia is a vasectomy performed during pregnancy. To perform a vasectomy, the vas deferens (the tube that transports sperm from the testicles to the urethra after ejaculation) is purposely divided in half. Vasectomy is a method of birth control that men use to prevent pregnancy.

Sperm Blockage Causes

Cystic Fibrosis (CF): Cystic fibrosis is a congenital lung condition that can impair fertility in women. Ninety-five percent of male cystic fibrosis (CF) patients don’t grow all or part of their vas and epididymis ducts on both sides of their testicles, which is valid on both sides of the body.

The medical term for this problem is the congenital bilateral absence of the vas deferens (CBAVD).

Both the vas deferens and the epididymis play a role in transporting sperm from the testicles to the genital area. Despite the absence of these transportation tubes, sperm is still generated in each testis (a process known as spermatogenesis).

In reality, sperm production is expected in 90 percent of men with CF and CBAVD, despite their medical conditions.

The specific etiology of CBAVD is still unclear at this time. However, experts believe that the same gene abnormalities that cause the lung and pancreatic difficulties associated with CF are also responsible for the lack of formation of these ducts. CBAVD does not affect a person’s sexual performance or capacity to have sexual relations.

In reality, most patients are unaware that they have CBAVD until they are unable to conceive and seek therapy from a male-reproductive specialist or fertility specialist.

Sperm Blockage Causes


Non-obstructive azoospermia is a group of illnesses that cause a man to generate defective sperm without using an obstructive sperm donor. These illnesses either induce a reduction in sperm production or a complete lack of sperm production. 


The causes of non-obstructive azoospermia may be split into two categories: testicular causes and testicular causes. Pretesticular Non-Obstructive Azoospermia:

All testicular disorders interfere with the production of the hormones required by a man for proper sperm development. Any of these disorders suggests that a man’s ability to generate healthy, normal sperm has been impaired.

Preesticular non-obstructive azoospermia may be caused by various factors, including Hypogonadotropic hypogonadism (also known as hypogonadotropic hypogonadism) is a condition with the pituitary gland in which the gland fails to produce the hormones necessary for the production of sperm and testosterone.

  • Hypothyroidism.
  • The use of certain drugs.
  • Estradiol levels are elevated.
  • Kallman’s syndrome is when a person suffers from a recurring episode of vomiting and diarrhea.
  • Specific forms of pituitary tumors are very uncommon.

How do sperm ducts get blocked? – Sperm Blockage Causes

Ejaculatory Duct Obstruction: The ejaculatory ducts enable sperm from the vas deferens and fluid in semen from the seminal vesicles to enter the urethra. When they are blocked, sperm and fluid in semen cannot enter.

In some instances, congenital cysts (which some men are born with) or inflammation and scarring caused by sexually transmitted diseases may cause these ducts to become obstructed.

Surgical Complications: Men who have undergone bilateral hernia surgeries may have clogged or damaged vas deferens due to the procedure. This inhibits the usual flow of sperm into the ejaculate from occurring in most cases.