Male infertility
Male infertility occurs when a male reproductive factor reduces the chance of conception. Problems can involve sperm production or function, obstruction, hormones, ejaculation, sexual function or genetic conditions, and many cause no obvious symptoms.
At a glance
Quick facts
- Contribution
- Male factors contribute to about half of infertile couples
- First-line test
- Semen analysis
- Abnormal result
- Usually repeated for confirmation
- Further assessment
- History, examination, hormones or genetics when indicated
- Important medication issue
- Exogenous testosterone can suppress sperm production
- Treatment
- Cause-directed care, IUI, IVF or ICSI
Dr. Farida Sani
Fertility Physician · Clearview Hospital and Fertility
Reviewed for clinical accuracy, fertility context and patient-facing clarity.
Names & terminology
How this entity may be named or searched
- Male-factor infertility
- Infertility in which a male reproductive factor contributes to difficulty conceiving.
- Azoospermia
- No sperm detected in the ejaculate on appropriately performed testing.
- Oligozoospermia
- Sperm concentration below the laboratory reference range.
- ICSI
- Intracytoplasmic sperm injection, in which a single sperm is injected into an oocyte during IVF.
Structured entity profile
Clinical profile
Overview
Male infertility is not rare. The AUA/ASRM guideline states that a male factor contributes in whole or in part to approximately half of infertile couples. Causes include impaired sperm production, obstruction of sperm transport, hormonal disorders, genetic conditions, ejaculatory dysfunction and other problems affecting sperm delivery or quality. [1] [2]
WHO also notes that male infertility may arise from absent or low sperm production, abnormal motility or morphology, reproductive-tract obstruction and endocrine disorders. Because male and female factors can coexist, evaluation should generally occur in parallel. [2] [3]
Symptoms and warning signs
Many men with infertility feel well and have no symptoms. Possible clues include reduced testicular size, scrotal swelling or varicocele, low libido or erectile symptoms, problems with ejaculation, previous undescended testis, genital infection, surgery, chemotherapy or use of testosterone or anabolic steroids. [1] [2]
SYMPTOM MATRIX
Male infertility is often found through testing rather than symptoms
History and examination help interpret semen results and identify conditions that may need targeted treatment.
- Difficulty conceiving with no other symptoms
- Abnormal semen analysis
- Need for repeat testing
- Male and female evaluation in parallel
- Ejaculatory or sexual dysfunction
- Varicocele or testicular abnormality
- History of undescended testis
- Previous genital infection or surgery
- Testosterone or anabolic-steroid exposure
- Testicular mass
- Severe or repeated azoospermia
- Marked endocrine symptoms
- New testicular pain or swelling
Male infertility assessment can occasionally uncover health problems beyond fertility, including endocrine or testicular disease.
Diagnosis
Semen analysis is the central first-line test. NICE uses WHO reference values and recommends repeating an abnormal test, ideally after enough time for a new cycle of sperm production unless azoospermia or severe oligozoospermia makes earlier confirmation appropriate. A single borderline result should not be interpreted in isolation. [2]
With repeated abnormalities, evaluation may include examination of the testes and scrotum, testosterone and gonadotrophins, and selected genetic testing. AUA/ASRM emphasizes that the male evaluation is important both for directing fertility treatment and because some infertility diagnoses have broader health or genetic implications. [1] [2]
Diagnostic pathway
Start with semen, then investigate the pattern
The goal is to distinguish production problems, obstruction, endocrine causes and functional problems that change treatment.
Fertility assessment is usually most useful when relevant male and female factors are evaluated in parallel.
Testosterone and fertility are not the same goal
External testosterone can suppress the hormonal signals required for sperm production and may worsen fertility. NICE specifically advises against androgens as treatment for semen abnormalities, and AUA/ASRM recommends fertility-aware management when testosterone deficiency and reproductive goals coexist. [1] [2]
Treatment and management
Treatment depends on the cause. Gonadotrophins can treat hypogonadotropic hypogonadism; selected obstruction or varicocele may have surgical options; ejaculatory dysfunction may need targeted management; and surgical sperm retrieval can be used in some forms of azoospermia. Empiric supplements or hormonal treatments are not automatically beneficial for every abnormal semen result. [1] [2]
Treatment is individualized according to the underlying cause, the pattern and severity of semen abnormalities, reproductive goals and fertility factors affecting both partners.
When enough usable sperm are present, IUI may be an option in selected couples. IVF with ICSI can overcome more severe sperm-number, motility or fertilisation problems, including use of surgically retrieved sperm in appropriate cases. The female partner’s age and fertility factors remain important in deciding how quickly to move to assisted reproduction. [1]
Treatment & care hub
Identify the male factor before choosing the technology
Male infertility treatment ranges from correcting a cause to using assisted reproduction.
Correct specific hormonal disorders
Hypogonadotropic hypogonadism is one example where targeted hormonal therapy can restore sperm production.
Address obstruction or anatomy
Reconstruction, varicocele treatment or sperm retrieval may be considered according to the diagnosis.
Use processed sperm strategically
IUI may be appropriate when sufficient motile sperm are available and other fertility factors support it.
Bypass major sperm limitations
ICSI allows fertilisation with a single selected sperm and is widely used for significant male-factor infertility.
Treatment is individualized according to diagnosis, age, reproductive goals and clinical context.
A semen analysis is not a simple fertility score
Semen parameters vary between samples and overlap between fertile and infertile populations. Reference values help standardize interpretation but do not by themselves prove or exclude fertility. Clinical context, repeat testing and the fertility status of the couple remain important. [1] [2]
Evidence snapshot
Male factors deserve parallel assessment
Focusing evaluation only on the female partner can miss a common contributor to infertility.
Common questions
Frequently asked questions
Semen analysis is the usual first-line test, interpreted alongside history and the fertility evaluation of the couple.
Yes. Guidelines recommend confirmatory testing because semen parameters vary and one result may not reflect a stable pattern.
External testosterone can suppress sperm production and is not a treatment for semen abnormalities in someone trying to conceive.
Azoospermia means no sperm are detected in the ejaculate on properly performed testing; further assessment is needed to determine whether the cause is production failure or obstruction.
No. Treatment depends on severity and cause and may include medical or surgical treatment, IUI, conventional IVF or ICSI.
Sources
- AUA / ASRM — Diagnosis and Treatment of Infertility in Men: Guideline (amended 2024)
- NICE — Fertility problems: assessment and treatment (NG257) - investigation, 2026
- WHO — Infertility fact sheet, 28 November 2025
This article is based on trusted medical sources and has undergone clinician review. It is not a substitute for personalized medical advice.
Male infertility evaluation starts with a detailed reproductive, sexual and medical history, including previous fertility, illnesses, medicines, lifestyle factors and reproductive-tract procedures; semen analysis is then a central first-line test.