Male Infertility: Causes, Symptoms, Diagnosis and Treatment

Male Infertility: Causes, Symptoms, Diagnosis and Treatment

Male infertility is a common reason some couples have difficulty becoming pregnant. It may be related to a low sperm count, poor sperm movement, abnormal sperm shape, problems with sperm production or conditions that prevent sperm from reaching the semen.

Importantly, male infertility does not always cause noticeable symptoms. In many cases, difficulty achieving pregnancy is the first sign that something may be affecting fertility. A proper fertility evaluation can help identify the underlying cause and determine which treatment options may be appropriate.

What Is Male Infertility?

Male infertility refers to a man's inability to contribute to conception despite regular, unprotected sexual intercourse over a period of time.

Pregnancy requires several steps to occur successfully. The testicles need to produce healthy sperm, the sperm must mature and move properly, and the reproductive tract must allow sperm to reach the semen. Problems at any of these stages can affect fertility.

Male infertility may occur because of:

• Low sperm count

• Poor sperm motility

• Abnormal sperm morphology

• Complete absence of sperm in semen

• Problems with sperm production

• Blockages in the reproductive tract

• Hormonal disorders

• Varicocele

• Genetic conditions

• Infections

• Certain medications or medical treatments

• Lifestyle and environmental factors

Male and female factors can also occur together, which is why fertility evaluation is generally recommended for both partners when pregnancy does not occur as expected.

How Common Is Male Infertility?

Infertility affects many couples, and male factors contribute to infertility in up to half of couples experiencing infertility. The exact cause may sometimes be identified, while in other cases no single cause is found even after evaluation.

This is why assuming that difficulty conceiving is automatically caused by the woman can delay appropriate testing and treatment.

What Are the Common Causes of Male Infertility?

There are many possible male infertility causes, and more than one factor may be involved.

1. Low Sperm Count

A low sperm count, also called oligospermia, means there are fewer sperm in the semen than expected.

Having fewer sperm can reduce the chance that a healthy sperm will reach and fertilise an egg.

Low sperm count can be associated with:

• Varicocele

• Hormonal problems

• Testicular conditions

• Certain infections

• Genetic conditions

• Some medications

• Cancer treatment

• Excessive heat exposure

• Smoking, alcohol and recreational drug use

• Certain environmental toxins

However, the cause of a low sperm count is not always identified.

2. Poor Sperm Motility

Sperm motility refers to how well sperm move.

Even when the sperm count is adequate, sperm may have difficulty reaching the egg if their movement is poor. This condition is commonly referred to as asthenozoospermia.

Sperm motility is one of the important parameters evaluated during a semen analysis.

3. Abnormal Sperm Morphology

Sperm morphology refers to the size and shape of sperm.

Some sperm may have abnormalities in their head, middle section or tail. A higher proportion of abnormal sperm can affect their ability to move properly or fertilise an egg.

Morphology is therefore evaluated alongside sperm count and motility rather than being considered in isolation.

4. Varicocele

A varicocele is an enlargement of veins within the scrotum. It may not cause noticeable symptoms, but in some men it can affect sperm production and quality.

Possible signs include:

• A dull ache in the scrotum

• Swelling

• A feeling of enlarged or prominent veins

• Testicular size changes

• Difficulty conceiving

Not every man with a varicocele has fertility problems. However, varicocele is an important potentially treatable cause of male infertility.

5. Azoospermia or Zero Sperm Count

Azoospermia means that no sperm are detected in the ejaculate.

It can broadly occur because:

• Obstructive azoospermia: sperm are produced but cannot reach the semen because of a blockage.

• Non-obstructive azoospermia: the problem is related to sperm production.

Possible causes include:

• Previous vasectomy

• Reproductive tract infections

• Genetic conditions

• Hormonal disorders

• Testicular conditions

• Certain medications

• Chemotherapy or radiation

• Undescended testicles

• Varicocele

Depending on the cause, treatment may include addressing hormonal problems, surgery to correct a blockage or sperm retrieval followed by assisted reproductive treatment.

6. Hormonal Imbalances

Hormones produced by the hypothalamus, pituitary gland and testicles play an important role in sperm production.

Problems involving testosterone, follicle-stimulating hormone (FSH), luteinising hormone (LH) or other reproductive hormones can affect sperm production.

Importantly, taking testosterone on your own is not a treatment for male infertility. Testosterone replacement therapy can suppress sperm production in some men. Men concerned about fertility should discuss testosterone or hormone treatment with a qualified specialist.

7. Infections

Certain infections can affect sperm production or damage the reproductive tract.

Examples include:

• Epididymitis

• Orchitis

• Some sexually transmitted infections

• Other infections affecting the reproductive system

In some cases, infections can cause scarring or blockages that interfere with sperm transport.

8. Blockages in the Reproductive Tract

Sperm must travel through several structures before being released in semen. A blockage anywhere along this pathway can prevent sperm from reaching the ejaculate.

Blockages may result from:

• Previous infections

• Surgery

• Injury

• Vasectomy

• Congenital conditions

• Scarring

A man may still produce sperm normally even when a blockage prevents sperm from appearing in the semen.

9. Genetic Conditions

Certain genetic or chromosomal conditions can affect sperm production or the development of the reproductive system.

Examples include:

• Klinefelter syndrome

• Y-chromosome abnormalities

• Certain forms of congenital absence of the vas deferens

• Other inherited conditions

Genetic testing may be recommended in selected men, particularly when sperm counts are extremely low or sperm are absent.

10. Erectile or Ejaculation Problems

Fertility also depends on the ability to have intercourse and deliver semen into the reproductive tract.

Conditions that can interfere with this process include:

• Erectile dysfunction

• Premature ejaculation

• Retrograde ejaculation

• Pain during intercourse

• Certain anatomical abnormalities

Retrograde ejaculation occurs when semen travels backward into the bladder instead of exiting through the penis.

11. Medications and Medical Treatments

Some medicines and medical treatments can affect sperm production or ejaculation.

Examples include certain:

• Hormonal medicines

• Testosterone treatments

• Anabolic steroids

• Cancer treatments

• Other prescription medicines

Chemotherapy and radiation can significantly affect sperm production, sometimes temporarily and sometimes for a longer period. Men who may undergo cancer treatment should discuss fertility preservation options with their healthcare team beforehand when appropriate.

12. Lifestyle and Environmental Factors

Several lifestyle and environmental factors may affect sperm production or quality.

These may include:

• Smoking

• Excessive alcohol consumption

• Recreational drug use

• Anabolic steroid use

• Obesity

• Prolonged exposure to high temperatures

• Certain pesticides and chemicals

• Heavy metals

• Radiation exposure

Not every man exposed to these factors will develop infertility, but reducing avoidable risks can be part of overall fertility care.

What Are the Symptoms of Male Infertility?

One of the most important things to understand about male infertility symptoms is that there may be no obvious symptoms.

The primary sign is often difficulty achieving pregnancy with a partner despite regular, unprotected intercourse.

However, some men may experience symptoms associated with an underlying condition, such as:

• Difficulty getting or maintaining an erection

• Low sexual desire

• Problems with ejaculation

• Pain or swelling around the testicles

• A lump or enlarged veins in the scrotum

• Recurrent reproductive infections

• Changes in testicular size

• Symptoms associated with hormonal problems

Having one of these symptoms does not automatically mean that a man is infertile. A medical evaluation is needed to determine the cause.

Can You Tell If Sperm Is Healthy by Looking at Semen?

No.

The appearance or thickness of semen cannot reliably determine sperm count, motility or morphology.

For example, semen may appear watery or different from usual, but this alone cannot diagnose low sperm count. Similarly, semen that looks normal does not necessarily mean that sperm parameters are normal.

A semen analysis is the appropriate laboratory test for evaluating sperm quantity and quality.

What Is a Semen Analysis?

A semen analysis is one of the main tests used when evaluating male fertility.

Depending on the laboratory, the test can assess:

• Semen volume

• Sperm concentration

• Total sperm number

• Sperm motility

• Sperm morphology

• Other characteristics of the semen

Sperm results can vary between samples. For this reason, a doctor may recommend more than one semen analysis before making conclusions about sperm health.

How Is Male Infertility Diagnosed?

A fertility evaluation usually begins with a detailed medical and reproductive history.

Your doctor may ask about:

• How long you have been trying to conceive

• Previous pregnancies

• Previous infections

• Testicular injuries

• Previous surgeries

• Medications

• Testosterone or steroid use

• Medical conditions

• Sexual and ejaculation problems

• Lifestyle factors

• Family history of fertility problems

Depending on the findings, additional tests may be recommended.

Semen Analysis

This is usually one of the first investigations used to assess male fertility.

Hormone Testing

Blood tests may evaluate testosterone and other hormones involved in reproductive function.

Scrotal Ultrasound

Ultrasound can help identify conditions such as varicocele or other abnormalities affecting the testicles.

Genetic Testing

Genetic tests may be recommended in selected cases, particularly with very low sperm counts or azoospermia.

Post-Ejaculation Urine Test

This test can help identify retrograde ejaculation when sperm are suspected of entering the bladder instead of leaving the penis.

Testicular Biopsy

In selected cases, a small tissue sample may help determine whether sperm production is occurring normally.

The specific tests required depend on the individual situation rather than being the same for every man.

What Are the Treatment Options for Male Infertility?

Treatment depends on the underlying cause, sperm parameters, the duration of infertility and the fertility needs of both partners.

1. Lifestyle Changes

Depending on the individual's circumstances, a doctor may recommend:

• Quitting smoking

• Limiting alcohol

• Avoiding recreational drugs

• Avoiding anabolic steroids

• Maintaining a healthy weight

• Exercising regularly

• Managing stress

• Reducing unnecessary heat exposure to the testicles

• Limiting exposure to certain chemicals and toxins

Lifestyle changes may support reproductive health, but they cannot correct every cause of infertility.

2. Medicines and Hormonal Treatment

If infertility is caused by a specific hormonal disorder, appropriate hormone treatment may help restore sperm production.

Treatment should be based on laboratory testing and specialist evaluation.

Men should not start testosterone therapy or fertility medicines without medical guidance, as some hormone treatments can reduce sperm production.

3. Treatment of Infections

If an infection is identified, appropriate treatment may be prescribed.

However, treating an infection does not always reverse fertility problems if permanent scarring or reproductive tract damage has already occurred.

4. Varicocele Treatment

In selected men with a clinically significant varicocele and fertility problems, surgical repair may be considered.

The decision depends on factors such as the physical examination, semen parameters and the couple's fertility circumstances. Treatment is not automatically required for every varicocele.

5. Surgery for Blockages

If sperm are being produced but cannot reach the semen because of a blockage, surgery may sometimes restore sperm flow.

Vasectomy reversal and procedures to repair certain reproductive tract blockages are examples of surgical approaches that may be considered in selected cases.

6. Sperm Retrieval

For some men with azoospermia or severe sperm production problems, sperm may be retrieved directly from the testicle or epididymis.

Retrieved sperm can sometimes be used with assisted reproductive techniques such as ICSI.

7. Intrauterine Insemination (IUI)

IUI involves placing prepared sperm directly into the uterus around the time of ovulation.

Whether IUI is appropriate depends on factors such as sperm quality, the female partner's fertility, fallopian tube status and other clinical considerations.

8. In Vitro Fertilisation (IVF) and ICSI

IVF involves fertilising an egg with sperm in a laboratory and transferring the resulting embryo into the uterus.

When sperm quantity or quality is significantly reduced, intracytoplasmic sperm injection (ICSI) may be used. ICSI involves injecting a single sperm directly into an egg.

These treatments can be considered when severe male-factor infertility makes natural conception or simpler fertility treatments less suitable.

Does Low Sperm Count Mean You Cannot Become a Father?

Not necessarily.

A low sperm count can reduce the probability of natural conception, but it does not automatically mean that pregnancy is impossible.

The effect depends on the overall sperm parameters, the underlying cause and the fertility of both partners.

Some causes of low sperm count can be treated, while in other situations assisted reproductive techniques may provide another route to pregnancy.

Can Male Infertility Be Prevented?

Not every case of male infertility can be prevented. Genetic conditions, certain medical conditions and some treatments are outside a person's control.

However, men can reduce exposure to some known risk factors by:

• Avoiding tobacco

• Limiting excessive alcohol

• Avoiding anabolic steroids and recreational drugs

• Maintaining a healthy weight

• Managing chronic health conditions

• Protecting the testicles from injury

• Avoiding unnecessary prolonged heat exposure

• Reducing occupational exposure to certain chemicals and toxins

Men planning cancer treatment can also discuss fertility preservation with their healthcare team before treatment when appropriate.

When Should You See a Fertility Specialist?

Consider seeking a fertility evaluation if pregnancy has not occurred after:

• 12 months of regular, unprotected intercourse when the female partner is under 35.

• 6 months when the female partner is 35 or older.

Earlier evaluation may be appropriate when there is a known or suspected fertility problem, such as:

• Previous testicular injury

• Undescended testicles

• Varicocele

• Previous vasectomy

• Sexual or ejaculation problems

• Very low or absent sperm count

• Previous chemotherapy or radiation

• Reproductive tract infections

• Known genetic conditions

Both partners may need evaluation because fertility can involve male factors, female factors or a combination of both.

Frequently Asked Questions About Male Infertility

What is the main cause of male infertility?

There is no single cause. Male infertility can result from problems with sperm production, sperm quality, sperm transport, hormones, reproductive anatomy, genetics, infections, lifestyle factors or certain medical treatments.

What are the signs of male infertility?

The most common sign is difficulty achieving pregnancy. Many men have no noticeable symptoms. Some may have erectile or ejaculation problems, testicular pain or swelling, hormonal symptoms or other signs related to an underlying condition.

How do I know if my sperm count is low?

A semen analysis is the main way to evaluate sperm count. Appearance of semen alone cannot reliably determine sperm count or sperm quality.

Can a man with zero sperm count have a baby?

In some cases, yes. Treatment depends on why sperm are absent from the semen. If sperm production is present but sperm cannot reach the ejaculate, surgery or sperm retrieval may be considered. Retrieved sperm can sometimes be used with IVF and ICSI.

Can varicocele cause male infertility?

Yes. Varicocele can affect sperm production and quality in some men. However, not every man with a varicocele has fertility problems.

Does testosterone increase sperm count?

Not necessarily. In fact, testosterone replacement therapy can suppress the body's natural sperm production. Men who are trying to conceive should discuss testosterone treatment with a fertility specialist before starting or continuing it.

Can male infertility be treated?

Many causes can be treated or managed. Depending on the cause, treatment may include lifestyle changes, medication, surgery, sperm retrieval, IUI, IVF or ICSI.

Conclusion

Male infertility can result from many different factors, and there is often more than one possible explanation for difficulty conceiving. Low sperm count, poor sperm motility, abnormal sperm morphology, varicocele, hormonal problems, azoospermia, infections, blockages, genetic conditions and certain lifestyle or medical factors can all play a role.

Because male infertility may have no obvious symptoms, a semen analysis and appropriate fertility evaluation are important when pregnancy does not occur within the expected timeframe.

The right treatment depends on the underlying cause and the reproductive needs of both partners. A fertility specialist can help identify the problem and discuss appropriate options, which may range from medical or surgical treatment to assisted reproductive techniques such as IUI, IVF or ICSI.