Male Fertility: Understanding the Causes of Male Factor Infertility

When we talk about fertility, it's important to remember that it's not just one person's journey.

Male factor infertility plays a role in around half of all fertility challenges, yet it's often less talked about.

At IVFbabble, we believe understanding both sides is key—because having clarity can help you move forward with confidence and the right support.

What is male factor infertility?

Male factor infertility refers to anything that affects a man's ability to contribute to conception.

This usually comes down to sperm health—how many sperm are produced, how well they move, and whether they can successfully fertilise an egg.

The most common issues include:

• Low sperm count
• Poor sperm movement (motility)
• Abnormal sperm shape (morphology)
• Problems with ejaculation or sperm delivery

But there are many underlying reasons why these issues can occur.

The main causes of male fertility issues

Male fertility is complex, and often it's not just one single cause. Instead, it can be influenced by a combination of factors.

1. Sperm production and quality issues

Sperm may be too few, poorly formed, or unable to swim effectively. In some cases, sperm may not be produced at all.

2. Medical and health conditions

Such as varicocele, infections, hormonal imbalances, chronic illness, or previous injury/surgery.

3. Blockages or delivery issues

Even if sperm are produced, they may not reach the semen due to blockages or structural issues.

4. Hormonal factors

Hormones control sperm production, and imbalances can affect fertility.

5. Lifestyle factors

Smoking, alcohol, stress, and weight can all impact sperm health.

6. Environmental influences

Heat, toxins, and pollution can affect sperm production over time.

7. Age and sperm health

Sperm quality can decline with age, particularly after 40.

8. Genetic factors

Some men may have underlying genetic conditions affecting fertility.

9. Unexplained infertility

Sometimes no clear cause is found—but there are still options to explore.

Fertility tests for men: when and what to check

Whether you're planning ahead or have been trying to conceive without success, male fertility testing can provide clarity early on.

If you're preparing for a family

Even before trying, some men choose to have a fertility check to understand their baseline.

This can include:

• Semen analysis – the first and most important test, assessing sperm count, movement, and shape
• General health checks – including lifestyle, weight, and medical history
• Hormone testing – to check testosterone and other key hormones

This can be especially helpful if you're planning to delay parenthood or simply want reassurance.

If you're struggling to conceive

If you've been trying for a year (or 6 months if over 35), further testing may be recommended.

In addition to a semen analysis, this may include:

• Repeat semen analysis (to confirm results)
• Sperm DNA fragmentation test – to assess the quality of sperm DNA
• Hormone blood tests – to check for underlying imbalances
• Scrotal ultrasound – to identify issues such as varicocele
• Genetic testing – in certain cases, particularly with very low sperm count
• Infection screening – if an underlying infection is suspected

These tests help build a clearer picture of what may be affecting fertility and guide the next steps.

Why early testing matters

One of the most important things we encourage at IVFbabble is early, shared testing.

Understanding male fertility early can:

• Save valuable time
• Reduce uncertainty
• Help guide the right treatment or support
• Open up more options moving forward

And importantly—it helps ensure that fertility is approached as a shared journey.

A gentle reminder

If you're at the beginning of your journey, or finding things aren't happening as expected, taking that first step to explore testing can feel like a positive move forward.

You don't need to have all the answers—you just need a place to start.

If you have any questions about this topic or anything else on IVFbabble, we're here to support and guide you—our team and leading global experts are here to help. You're not alone. 💛