Male infertility is an important aspect of reproductive health and can contribute to difficulty in achieving pregnancy. Infertility is not exclusively a female health concern. In many couples, male factors may contribute independently or alongside female reproductive factors.
Understanding male reproductive health, identifying possible causes and undergoing appropriate medical evaluation can help determine the factors affecting conception.
What Is Male Infertility?
Male infertility refers to reproductive difficulties associated with factors affecting sperm production, sperm function, sperm transport or the ability to achieve ejaculation.
Infertility is generally assessed at the couple level. According to the World Health Organization (WHO), infertility is defined as the failure to achieve pregnancy after 12 months or more of regular, unprotected sexual intercourse.
Male factors may contribute to infertility independently or in combination with female factors.
These factors can include:
- Reduced sperm production.
- Low sperm concentration.
- Poor sperm motility.
- Abnormal sperm morphology.
- Blockages in the reproductive tract.
- Hormonal imbalances.
- Sexual or ejaculatory dysfunction.
An abnormal semen analysis does not automatically mean that a man cannot father a child. Results need to be interpreted alongside medical history, examination and the reproductive health of both partners.
What Are the Common Causes of Male Infertility?
Male infertility can arise from several medical, genetic, hormonal and environmental factors.
1. Low Sperm Count (Oligozoospermia)
Oligozoospermia refers to a lower-than-reference sperm concentration in semen.
It may be associated with:
- Hormonal disturbances.
- Testicular conditions.
- Genetic abnormalities.
- Previous infections.
- Certain medications.
- Exposure to excessive heat or environmental toxins.
The underlying cause needs to be assessed rather than relying on sperm concentration alone.
2. Poor Sperm Motility (Asthenozoospermia)
Sperm motility refers to the ability of sperm cells to move.
Progressive motility is particularly relevant because sperm need to travel through the female reproductive tract to reach the egg.
Reduced motility may be associated with abnormalities in sperm development, oxidative stress, infections and other reproductive health conditions.
3. Abnormal Sperm Morphology (Teratozoospermia)
Sperm morphology describes the size and shape of sperm cells.
Abnormal morphology may affect the proportion of sperm with a typical structure. However, morphology should not be interpreted in isolation because it does not independently establish whether natural conception is possible.
4. Varicocele
A varicocele is an enlargement of veins within the scrotum, similar to varicose veins.
It may be associated with increased testicular temperature and changes in the testicular environment.
In some men, varicocele is associated with impaired sperm production or quality. However, not every varicocele requires treatment.
5. Hormonal Imbalances
Hormones play an essential role in regulating sperm production.
The hypothalamus and pituitary gland regulate testicular function through hormones such as follicle-stimulating hormone (FSH) and luteinising hormone (LH).
Conditions affecting testosterone production or hormonal regulation may interfere with spermatogenesis.
6. Blockages in the Reproductive Tract
Obstructions in the reproductive tract can prevent sperm from entering the semen.
Possible causes include:
- Congenital absence or abnormalities of reproductive ducts.
- Previous infections.
- Surgical procedures.
- Injury or trauma.
In some cases, sperm production remains normal even when sperm cannot be detected in the ejaculate.
7. Genetic Conditions
Certain genetic conditions can affect testicular development, sperm production or sperm transport.
Examples include:
- Klinefelter syndrome.
- Y-chromosome microdeletions.
- CFTR gene-related abnormalities associated with congenital absence of the vas deferens.
Genetic investigations may be recommended in selected cases, particularly when sperm production is severely impaired or absent.
8. Infections and Medical Conditions
Certain infections involving the reproductive tract may affect sperm production or transport.
Other medical conditions, including diabetes, systemic illnesses and previous cancer treatments, may also influence male reproductive health.
The impact depends on the nature and severity of the condition.
What Are the Symptoms of Male Infertility?
Male infertility often has no noticeable symptoms.
Many men discover reproductive difficulties only when a couple undergoes an infertility evaluation.
Depending on the underlying condition, some individuals may experience:
- Difficulty achieving or maintaining an erection.
- Reduced sexual desire.
- Pain, swelling or a lump in the testicular region.
- Changes in ejaculation.
- Hormonal symptoms such as reduced facial or body hair.
- A history of testicular injury, surgery or infection.
The absence of these symptoms does not necessarily indicate normal sperm production.
How Is Male Infertility Diagnosed?
Evaluation involves understanding medical history, identifying potential risk factors and conducting appropriate investigations.
1. Medical and Reproductive History
The assessment may include questions about:
- Previous pregnancies and reproductive history.
- Duration of difficulty conceiving.
- Past infections or sexually transmitted infections.
- Previous surgeries or injuries.
- Chronic medical conditions.
- Current and previous medication use.
- Smoking, alcohol consumption and occupational exposures.
A physical examination may also be required to assess testicular size, reproductive anatomy and signs of hormonal abnormalities.
2. Semen Analysis
Semen analysis is one of the primary investigations used in evaluating male reproductive health.
The laboratory examines several parameters, including:
| Parameter | What It Assesses |
| Semen volume | Amount of semen produced |
| Sperm concentration | Number of sperm per millilitre |
| Total sperm number | Total sperm in the ejaculate |
| Sperm motility | Movement of sperm |
| Sperm morphology | Shape and structure of sperm |
| Vitality | Proportion of living sperm |
The World Health Organization’s sixth edition of its laboratory manual provides standardised procedures for semen examination and laboratory quality assessment.
Sample collection should follow the laboratory’s instructions. The duration of sexual abstinence, completeness of sample collection and time taken to deliver the sample can influence the results.
A single abnormal semen analysis may not provide a complete picture of reproductive health. Repeat testing may be recommended depending on the findings.
3. Hormonal Testing
Blood tests may be advised when the medical history, physical examination or semen analysis suggests a hormonal problem.
Depending on the clinical findings, investigations may include:
- Follicle-stimulating hormone (FSH).
- Luteinising hormone (LH).
- Testosterone.
- Prolactin.
- Other selected hormonal investigations.
These tests help assess the hormonal mechanisms involved in sperm production.
4. Genetic Testing
Genetic investigations may be considered in selected cases of azoospermia (absence of sperm in the ejaculate) or severe oligozoospermia.
Depending on clinical findings, these may include:
- Karyotype analysis.
- Y-chromosome microdeletion testing.
- CFTR genetic testing in selected obstructive conditions.
Genetic counselling may be relevant when an inherited condition is identified.
5. Imaging and Additional Investigations
Ultrasound and other specialised investigations may be recommended when clinically indicated.
For example, scrotal ultrasound may help assess suspected structural abnormalities, while transrectal ultrasound may be considered in selected cases of suspected ejaculatory duct obstruction.
Not every individual requires all these investigations. Testing should be guided by the clinical assessment.
What Are the Treatment Options for Male Infertility?
Treatment depends on the underlying cause, reproductive history and the findings of investigations.
There is no single treatment suitable for every individual.
1. Treatment of Underlying Medical Conditions
When infertility is associated with a specific medical or hormonal condition, management may focus on addressing that condition.
Selected hormonal disorders may respond to medically supervised treatment.
However, testosterone replacement therapy should not be used as a fertility treatment in men seeking to maintain or restore sperm production, as external testosterone can suppress spermatogenesis.
2. Surgical Management
Certain structural conditions may require surgical assessment.
Examples include:
- Selected cases of clinically significant varicocele.
- Obstructive conditions affecting sperm transport.
- Selected cases of reproductive tract abnormalities.
The potential benefits and limitations of surgery depend on the underlying diagnosis.
3. Assisted Reproductive Techniques
Depending on the reproductive findings of both partners, assisted reproductive techniques may be considered.
These include:
Intrauterine Insemination (IUI):
IUI involves placing prepared sperm into the uterus around the time of ovulation. Its suitability depends on factors including sperm parameters and female reproductive health.
In Vitro Fertilisation (IVF):
IVF involves fertilisation of an egg with sperm in a laboratory setting, followed by the transfer of an embryo into the uterus.
Intracytoplasmic Sperm Injection (ICSI):
ICSI involves the injection of a single sperm directly into an egg. It may be considered in certain cases of significant male-factor infertility.
Surgical Sperm Retrieval:
In selected cases where sperm are absent from the ejaculate, sperm may be retrieved through a surgical procedure. Whether this is appropriate depends on the underlying condition.
The choice of reproductive technique requires an individual assessment of both partners.
Can Lifestyle Factors Affect Male Fertility?
Lifestyle and general health can influence male reproductive function, although the strength of evidence varies across different risk factors.
Certain measures may support overall reproductive health:
- Maintaining a balanced and nutritious diet.
- Engaging in regular physical activity.
- Maintaining a healthy body weight.
- Avoiding tobacco and recreational drug use.
- Limiting excessive alcohol consumption.
- Avoiding unnecessary exposure to excessive heat.
- Managing chronic medical conditions.
- Reviewing medications that may affect reproductive function with a qualified medical practitioner.
Anabolic steroid use and non-prescribed testosterone can interfere with sperm production.
It is important to recognise that lifestyle changes cannot correct every cause of male infertility. Supplements and antioxidant preparations should not be assumed to improve fertility, as evidence supporting their clinical benefit remains limited.
When Should a Couple Seek an Infertility Evaluation?
Medical evaluation is generally recommended when pregnancy has not occurred after 12 months of regular, unprotected intercourse.
Earlier assessment may be appropriate when either partner has known reproductive health concerns, previous reproductive surgery, testicular conditions, irregular menstrual cycles or other relevant medical risk factors.
Both partners should undergo assessment rather than assuming that infertility is caused by only one individual.
An appropriate evaluation helps identify possible contributing factors and determine whether further investigations or treatment are indicated.
Frequently Asked Questions
1. Can male infertility be treated?
Some causes of male infertility are treatable, depending on the underlying medical condition. Treatment may involve managing hormonal abnormalities, selected surgical procedures or assisted reproductive techniques. Outcomes vary between individuals.
2. Does a low sperm count always mean infertility?
No. A low sperm count may reduce the probability of conception, but it does not independently establish whether natural pregnancy is possible. Other semen parameters and the reproductive health of both partners also matter.
3. Can a man have normal sexual function and still experience infertility?
Yes. Sexual function and sperm production are different aspects of male reproductive health. A man may have normal libido, erections and ejaculation while having abnormalities in sperm production or quality.
4. Is semen analysis sufficient to diagnose male infertility?
Semen analysis is an important initial investigation, but it is not sufficient in every case. Medical history, physical examination and additional tests may be required to understand the underlying cause.
5. Does age affect male fertility?
Male reproductive function may change with advancing age. Changes can occur in semen parameters and sperm DNA integrity. However, age alone cannot determine an individual’s fertility status.
6. Can azoospermia be treated?
Azoospermia refers to the absence of sperm in the ejaculate. Its causes include obstructive and non-obstructive conditions. Depending on the diagnosis, treatment or surgical sperm retrieval may be considered in selected cases.
Conclusion
Male infertility is a multifactorial reproductive health condition that requires appropriate medical evaluation. Factors affecting sperm production, hormonal regulation, reproductive anatomy and sperm transport may all contribute to difficulties in conception.
A systematic assessment of both partners helps identify potential causes and supports informed decisions regarding further investigations and treatment.
Understanding male reproductive health is an important part of a comprehensive approach to infertility.
