Male infertility is more common than most conversations let on. According to the World Health Organization, 1 in 6 people will encounter a fertility obstacle at some point in their lives, and a male factor is present in 30% to 50% of diagnosed cases. Despite this, it remains a topic many men don’t know how to approach, partly because it produces no visible symptoms, and partly because clear, accessible information is still scarce.

What Is Azoospermia and How Does It Affect Male Fertility?

Azoospermia is the complete absence of sperm. This isn’t about low sperm count. It means no detectable sperm at all in a semen analysis.

It affects approximately 1% of men in the general population and 10–15% of men diagnosed with infertility. It is one of the most significant causes of male infertility, but also one of the conditions with the broadest range of treatment options available today.

An important distinction: azoospermia has no symptoms. It doesn’t cause pain, doesn’t alter ejaculation, and doesn’t affect sexual drive. The only way to detect it is through a semen analysis, the foundational test in male fertility evaluation.

Why Does It Happen? The Two Types of Azoospermia

Not all azoospermia is the same. Each type has a distinct cause and, accordingly, a different clinical approach. Identifying which type is present determines what treatment makes sense and what the realistic chances are of retrieving sperm.

Obstructive Azoospermia (OA)

The testes produce sperm normally, but a blockage somewhere along the reproductive tract prevents them from reaching the ejaculate. Common causes include prior vasectomy, infections, previous surgeries, or congenital malformations of the seminal ducts. In these cases, the sperm exist. They simply have no way out.

Non-Obstructive Azoospermia (NOA)

Here the issue lies in production itself. The testes produce very few or no sperm. Causes can be genetic, hormonal, or related to prior exposure to chemotherapy or radiation, as well as conditions like severe varicocele. This type accounts for approximately 70% of azoospermia cases.

How Common Is Azoospermia?

While 1% may sound like a small number, in real terms it represents millions of men worldwide. In Mexico, where infertility remains an underdiagnosed topic, many cases go undetected simply because no basic evaluation has ever been done.

There is a persistent cultural assumption that infertility is primarily a female issue. The clinical evidence doesn’t support this: when a couple is unable to conceive, the male factor, the female factor, and a combined factor each carry equivalent diagnostic weight. Evaluating male fertility from the start isn’t a secondary consideration. It’s an essential part of a complete workup.

Is Azoospermia Treatable?

Yes, and the options are broader than most people expect. The appropriate treatment depends directly on the type of azoospermia and its underlying cause.

In obstructive cases, surgical correction to remove the blockage is sometimes possible. More frequently, the preferred approach involves direct sperm retrieval through testicular biopsy using surgical microscopy, which allows clinicians to identify active sperm production sites within the tissue. Sperm retrieval rates with this technique range from 40% to 60%, depending on the underlying cause.

When the cause is hormonal and medically addressable, pharmacological treatment may be used to restore sperm production before considering any surgical intervention.

From Diagnosis to Treatment: How it works

The diagnostic and treatment pathway follows a clear logic:

• Semen analysis: The first step. It detects the absence of sperm and helps classify the type of azoospermia.
• Hormonal and genetic testing: These identify the specific underlying cause and guide the decision on which intervention is most appropriate.
• Testicular biopsy: If azoospermia is confirmed, this evaluates whether sperm can be retrieved directly from testicular tissue.
• IVF with ICSI: Retrieved sperm are used to fertilize eggs through intracytoplasmic sperm injection. In obstructive cases, sperm retrieval rates exceed 90%.

What If You Don’t Have a Fertility Diagnosis Yet?

Many men come across this information without having done any testing. That’s completely understandable. Suspicion, uncertainty, or simply the time that has passed without achieving a pregnancy are all valid reasons to seek an evaluation.

A semen analysis is the starting point. It’s non-invasive, accessible, and can clarify whether a male factor warrants further investigation.

Receiving a diagnosis of azoospermia doesn’t close doors. If anything, it opens them by making it possible to understand what’s happening and how to move forward.

Other Common Causes of Male Infertility

Azoospermia is one of several conditions identified during a male fertility evaluation. The most frequently diagnosed causes include:

• Varicocele: Dilation of the veins surrounding the testicle, which raises local temperature and impairs sperm production and quality. It is the most common treatable cause of male infertility.
• Hormonal imbalances: Low testosterone or other reproductive hormone deficiencies can reduce or halt sperm production.
• Genetic conditions: Disorders such as Klinefelter syndrome or Y-chromosome microdeletions directly impair spermatogenesis.
• Unaddressed infections: Prior sexually transmitted or reproductive tract infections can cause scarring or obstruction in the seminal ducts over time.
• Toxic or medical exposure: Chemotherapy, radiation therapy, prolonged pesticide exposure, excessive heat, or certain medications can damage sperm production temporarily or permanently.
• Congenital obstructions: Some men are born without vas deferens or with structural abnormalities that prevent semen transport, regardless of whether production itself is normal.

Get a fertility check-up at Nascere

If you have questions about your fertility, suspect something may be affecting it, or simply want a clear picture of where things stand today, Nascere can help. We have the diagnostic tools to identify azoospermia and its causes, along with the assisted reproductive technology to support your path to parenthood.