Infertility is often thought of as a woman’s problem, but research shows that male factors contribute to about half of all infertility cases. In many couples who have difficulty conceiving, problems with sperm production, sperm function, or sperm delivery may be involved.
The good news is that many causes of male infertility can be identified through proper medical evaluation and laboratory testing. Early diagnosis may improve treatment options and increase the chances of conception.
In this article, you’ll learn the common causes of male infertility, symptoms, risk factors, diagnostic tests, available treatments, and when to seek medical advice.
What Is Male Infertility?
Male infertility is the inability of a man to contribute to pregnancy after 12 months of regular, unprotected sexual intercourse (or after 6 months if the female partner is 35 years or older, depending on clinical recommendations).
Infertility does not always mean a man is completely unable to father a child. It may simply mean that conception is more difficult because of problems affecting sperm or the reproductive system.
How Common Is Male Infertility?
Male infertility is more common than many people realize. According to international health organizations, male factors are involved in approximately 40–50% of infertility cases among couples.
Because infertility can involve one or both partners, healthcare providers usually recommend evaluating both individuals.
Common Causes of Male Infertility
1. Low Sperm Count
A low sperm count means fewer sperm are present in the semen than expected.
Fewer sperm reduce the chances of one reaching and fertilizing an egg.
Possible causes include:
- Hormonal disorders
- Genetic conditions
- Previous infections
- Certain medications
- Lifestyle factors
2. Poor Sperm Motility
Sperm motility refers to how well sperm move.
If sperm cannot swim effectively through the female reproductive tract, fertilization becomes less likely.
3. Abnormal Sperm Shape (Morphology)
The shape of sperm affects their ability to fertilize an egg.
Abnormal sperm morphology may reduce fertility, although pregnancy can still occur in many cases depending on overall semen quality.
4. Varicocele
A varicocele is an enlargement of the veins within the scrotum.
It is one of the most common potentially treatable causes of male infertility and may affect sperm production and quality.
5. Hormonal Problems
Hormones produced by the brain and testes regulate sperm production.
Conditions affecting these hormones may reduce sperm production.
Examples include:
- Low testosterone associated with certain medical conditions
- Disorders of the pituitary gland
- Thyroid disorders
6. Infections
Certain infections can affect sperm production or reproductive structures.
Examples include:
- Sexually transmitted infections (STIs)
- Mumps affecting the testicles (orchitis)
- Epididymitis
- Prostatitis
Early diagnosis and treatment may reduce complications.
7. Blockage of the Reproductive Tract
Some men produce healthy sperm, but a blockage prevents sperm from being released during ejaculation.
Possible causes include:
- Previous surgery
- Infection
- Congenital abnormalities
- Injury
8. Undescended Testicles
Men born with one or both testicles that did not descend into the scrotum may have a higher risk of reduced fertility, especially if the condition was not corrected early.
9. Genetic Conditions
Certain inherited disorders may interfere with sperm production.
Examples include:
- Klinefelter syndrome
- Y chromosome microdeletions
- Cystic fibrosis-related abnormalities affecting the reproductive tract
Genetic testing may be recommended in selected cases.
10. Lifestyle Factors
Several lifestyle habits may affect male fertility, including:
- Smoking
- Excessive alcohol consumption
- Recreational drug use
- Obesity
- Poor diet
- Physical inactivity
- Chronic stress
- Inadequate sleep
Improving lifestyle habits may help improve overall reproductive health.
11. Heat Exposure
Frequent exposure of the testicles to excessive heat may temporarily reduce sperm production.
Possible sources include:
- Hot tubs
- Saunas
- Prolonged laptop use directly on the lap
- Certain occupational heat exposures
12. Certain Medications and Medical Treatments
Some medicines and medical treatments may affect fertility.
Examples include:
- Chemotherapy
- Radiation therapy
- Anabolic steroid misuse
- Certain hormone therapies
Never stop prescribed medication without discussing it with your healthcare provider.
Symptoms of Male Infertility
Many men have no obvious symptoms other than difficulty achieving pregnancy with their partner.
Some men may experience:
- Difficulty fathering a child
- Reduced sexual desire
- Erectile dysfunction
- Pain or swelling in the scrotum
- Small or firm testicles in some medical conditions
- History of recurrent genital infections
Because symptoms may be absent, medical evaluation is important when pregnancy does not occur after the recommended period.
Risk Factors
Factors associated with male infertility include:
- Increasing age
- Smoking
- Excessive alcohol intake
- Obesity
- Diabetes
- Previous testicular injury
- Exposure to certain industrial chemicals
- Radiation exposure
- Family history of infertility
- Untreated sexually transmitted infections
How Is Male Infertility Diagnosed?
Diagnosis usually begins with a detailed medical history and physical examination.
Common investigations include:
Semen Analysis
This is the most important initial laboratory test.
It evaluates:
- Semen volume
- Sperm concentration
- Sperm motility
- Sperm morphology
- Other characteristics of the semen
Sometimes more than one semen analysis is required because sperm quality naturally varies over time.
Hormonal Blood Tests
Blood tests may include:
- Follicle-Stimulating Hormone (FSH)
- Luteinizing Hormone (LH)
- Testosterone
- Prolactin
- Thyroid function tests (when indicated)
Scrotal Ultrasound
Ultrasound can help identify:
- Varicocele
- Testicular abnormalities
- Epididymal problems
- Other scrotal conditions
Additional Tests
Depending on individual circumstances, your healthcare provider may recommend:
- Genetic testing
- Urine analysis after ejaculation (in selected cases)
- STI screening
- Specialized sperm function tests
Can Male Infertility Be Treated?
Treatment depends on the underlying cause.
Management may include:
- Lifestyle modifications
- Treatment of infections
- Hormonal therapy for selected hormonal disorders
- Surgery (such as varicocele repair in appropriate cases)
- Assisted reproductive technologies (ART), including intrauterine insemination (IUI) or in vitro fertilization (IVF), when indicated
Your healthcare provider will recommend the most appropriate treatment based on your diagnosis.
Can Male Infertility Be Prevented?
Not every cause can be prevented, but healthy habits may reduce certain risks.
Consider:
- Avoiding smoking.
- Limiting alcohol intake.
- Maintaining a healthy weight.
- Exercising regularly.
- Eating a balanced diet.
- Protecting the testicles from injury.
- Seeking prompt treatment for infections.
- Avoiding anabolic steroid misuse.
Frequently Asked Questions
Can a man with a low sperm count still father a child?
Yes. Pregnancy may still occur naturally in some cases, depending on sperm quality and other factors. However, a low sperm count may reduce the chances of conception.
Does age affect male fertility?
Yes. Although men can remain fertile into older age, increasing age may be associated with reduced sperm quality and longer time to conception.
Is infertility always caused by the man?
No. Infertility may involve the male partner, the female partner, both partners, or remain unexplained despite evaluation.
How long should a couple try before seeking help?
Most couples should seek medical evaluation after 12 months of regular, unprotected intercourse without pregnancy. Couples in which the female partner is 35 years or older, or where either partner has known fertility risk factors, may benefit from earlier assessment.
When Should You See a Healthcare Provider?
Consult a healthcare professional if:
- You have been trying to conceive for one year without success.
- You have a history of undescended testicles.
- You have had testicular surgery or injury.
- You experience persistent testicular pain or swelling.
- You have erectile or ejaculation problems.
- You have previously received chemotherapy or radiation therapy.
- You have concerns about your fertility.
Early evaluation can identify treatable causes and improve reproductive planning.
Conclusion
Male infertility is a common medical condition that can result from problems with sperm production, sperm function, hormonal disorders, infections, genetic conditions, or lifestyle factors. Fortunately, many causes are treatable, especially when identified early.
If you and your partner have difficulty conceiving, both partners should undergo appropriate medical evaluation. Modern laboratory testing and imaging play an essential role in identifying the underlying cause and guiding treatment.
Male Fertility Testing at Omokos Diagnostics
At Omokos Diagnostics, we provide reliable laboratory and diagnostic services to support male fertility evaluation. Our services include Semen Analysis, hormonal profile testing, urinalysis, sexually transmitted infection screening, and ultrasound examinations performed using standard laboratory procedures and modern diagnostic equipment.
Our team is committed to providing accurate, confidential, and timely results to support informed medical decisions.
Medical Disclaimer
This article is intended for educational and informational purposes only and should not be used as a substitute for professional medical advice, diagnosis, or treatment. If you have concerns about infertility or reproductive health, consult a qualified healthcare professional for proper evaluation and personalized care. Never ignore persistent symptoms or delay seeking medical advice because of information you have read online.
References
- World Health Organization (WHO). WHO Laboratory Manual for the Examination and Processing of Human Semen, 6th Edition.
- American Urological Association (AUA) and American Society for Reproductive Medicine (ASRM). Diagnosis and Treatment of Infertility in Men: Clinical Practice Guideline.
- European Association of Urology (EAU). EAU Guidelines on Sexual and Reproductive Health.
- National Institute for Health and Care Excellence (NICE). Fertility Problems: Assessment and Treatment.
- Mayo Clinic. Male Infertility: Symptoms and Causes.
- Centers for Disease Control and Prevention (CDC). Infertility FAQs.
- Agarwal A, Baskaran S, Parekh N, et al. Male infertility. The Lancet. 2021;397(10271):319–333.
