Male Infertility

Introduction

If you and your partner have been trying to conceive without success, and tests have pointed to a male factor, this article is for you. Male infertility is common — it contributes to roughly half of all cases where a couple struggles to conceive — and in most situations there are clear paths forward. Some men benefit from lifestyle changes, some from medical or surgical treatment, and many couples use assisted reproductive techniques to achieve pregnancy.

This guide explains what male infertility means, what causes it, how it is investigated, and the range of treatments that fertility specialists and urologists use. It is written for men who have already begun the evaluation process, or who have a diagnosis and are planning next steps as part of a couple. Throughout, the article uses the term “male infertility” as that is how most people refer to the condition; the medical literature sometimes uses “male factor infertility” or “subfertility” for the same issue.

What Is Male Infertility?

Male infertility is generally defined as the inability of a man to cause pregnancy in a fertile female partner after twelve months of regular, unprotected intercourse. If the female partner is over 35, the recommended evaluation timeline is six months rather than twelve, because female fertility declines with age and earlier investigation is warranted.

Infertility is a condition of the couple, not of one partner alone. When a couple is evaluated, around one-third of cases are found to involve a male factor only, another third involve a female factor only, and roughly one-third involve factors in both partners or remain unexplained. For this reason, current guidance from the American Urological Association (AUA) and the American Society for Reproductive Medicine (ASRM) recommends that both partners be evaluated at the same time, rather than evaluating the woman first and the man only if no female cause is found.

Male fertility depends on several things working together:

• The testes producing enough healthy sperm
• Hormones from the brain and testes coordinating sperm production
• Open passageways carrying sperm from the testes to the urethra
• The ability to deliver sperm into the female reproductive tract through ejaculation

A problem in any of these areas can result in difficulty conceiving. Importantly, infertility is not the same as impotence (erectile difficulty), and many men with male infertility have completely normal sexual function. The two conditions can overlap, but they are separate issues.

Types and Patterns of Male Infertility

Doctors generally group male infertility findings into a few broad patterns. Knowing which pattern applies helps direct the workup and treatment.

Problems with sperm production

The testes may produce too few sperm (oligozoospermia), no sperm at all (azoospermia), sperm that do not move well (asthenozoospermia), sperm with abnormal shape (teratozoospermia), or a combination of these. When low count, poor movement, and abnormal shape are present together, the condition is sometimes called oligoasthenoteratozoospermia, or OAT.

Obstructive vs non-obstructive azoospermia

When no sperm are found in the ejaculate, the cause is either a blockage in the reproductive tract (obstructive azoospermia) or a failure of sperm production in the testes (non-obstructive azoospermia). The distinction is important because the treatment pathways are very different. Obstructive azoospermia often responds to surgical repair or surgical sperm retrieval with high success. Non-obstructive azoospermia is more challenging, but sperm can sometimes still be retrieved directly from the testis for use in assisted reproduction.

Functional sperm problems

In some men, sperm count and movement appear normal on a basic semen analysis, but the sperm have damaged DNA or fail to fertilise eggs effectively. This is sometimes only discovered after assisted reproduction attempts do not succeed, and may require more advanced sperm function tests.

Ejaculatory problems

In a smaller proportion of cases, sperm are produced normally but cannot be delivered. This includes retrograde ejaculation (sperm enters the bladder instead of being expelled), anejaculation (no ejaculation occurs), and severe erectile dysfunction that prevents intercourse.

Causes and Risk Factors

The list of conditions that can affect male fertility is long. In many men, more than one factor is at play, and in a meaningful proportion of cases no clear cause can be identified even after a full workup — a situation called idiopathic male infertility.

Varicocele

A varicocele is an enlargement of veins within the scrotum, similar to a varicose vein elsewhere in the body. It is one of the most common identifiable and treatable causes of male infertility. Varicoceles can raise the temperature within the scrotum and impair sperm production over time. They are found in roughly 15 percent of all men but in a higher proportion of men with infertility.

Hormonal causes

Sperm production is driven by hormones from the pituitary gland (FSH and LH) acting on the testes, which in turn produce testosterone and sperm. Disorders of the pituitary or hypothalamus, low gonadotropin levels (hypogonadotropic hypogonadism), and thyroid or prolactin disorders can all affect fertility. Notably, men taking testosterone supplements or anabolic steroids often have suppressed sperm production, sometimes severely, because external testosterone signals the brain to stop sending the hormones that drive natural sperm production.

Genetic causes

Several genetic conditions can affect male fertility:

• Klinefelter syndrome — an extra X chromosome (47,XXY), associated with small testes and very low sperm production
• Y chromosome microdeletions — small missing pieces of the Y chromosome that affect sperm production
• Cystic fibrosis gene mutations — can cause absence of the vas deferens (the tubes that carry sperm), even in men without other cystic fibrosis symptoms
• Other chromosomal abnormalities that may affect sperm production or function

Infections and inflammation

Past or current infections — including sexually transmitted infections, mumps after puberty, tuberculosis, and urinary tract infections — can damage sperm-producing tissue or block sperm passageways. Inflammation of the testes (orchitis) or epididymis (epididymitis) can have lasting effects.

Past surgery or injury

Surgery in the groin or pelvic area, including hernia repair and prostate surgery, can sometimes affect the structures that carry sperm or trigger ejaculation. Testicular injury, torsion (twisting) of the testis, or a history of undescended testis in childhood can also affect later fertility.

Cancer and its treatments

Cancer itself, and the chemotherapy and radiation used to treat it, can damage sperm production. Effects may be temporary or permanent depending on the agent, dose, and individual response. Men diagnosed with cancer who may want to have children later are usually offered the option of sperm freezing before treatment begins.

Lifestyle and environmental factors

A number of modifiable factors can affect sperm quality:

• Smoking reduces sperm count and movement
• Heavy alcohol use affects testosterone and sperm production
• Recreational drugs, including marijuana and opioids
• Anabolic steroids and testosterone supplements (a particularly important and reversible cause)
• Obesity, which alters hormone balance
• Heat exposure — frequent hot tubs, saunas, or laptop use directly on the lap
• Occupational exposures to pesticides, heavy metals, and certain chemicals
• Some prescription medications, including certain blood pressure drugs, antidepressants, and chemotherapy agents

Age

Male fertility declines with age, though more gradually than female fertility. Sperm count typically remains adequate into later life, but sperm quality, DNA integrity, and the likelihood of conception per cycle decrease. Advanced paternal age is also associated with a small increase in certain genetic conditions in offspring.

Diagnosis

Evaluation of male infertility usually begins with a history, physical examination, and at least one semen analysis. From there, additional tests are added based on what is found. The goal is to identify a treatable cause where possible and to guide decisions about which treatment pathway is most likely to lead to a pregnancy.

Medical history

A urologist or fertility specialist will ask about:

• How long you have been trying to conceive, and frequency of intercourse
• Any previous pregnancies you have caused (in this or a prior relationship)
• Childhood conditions such as undescended testis or mumps after puberty
• Past surgery, injury, infections, or chemotherapy/radiation
• Current and past medications, including testosterone or anabolic steroids
• Lifestyle factors — smoking, alcohol, recreational drugs, heat exposure, occupation
• Sexual function, including erections and ejaculation
• Family history of infertility or genetic conditions

Physical examination

The examination focuses on the genital area: the size and consistency of the testes, the presence of the vas deferens on each side, any varicocele, and signs of hormonal imbalance such as reduced body hair or breast tissue enlargement (gynaecomastia). A general examination may also be done to look for clues to systemic causes.

Semen analysis

• Volume of the ejaculate
• Concentration — number of sperm per millilitre
• Total sperm count in the sample
• Motility — the percentage of sperm that are moving, and how well
• Morphology — the percentage of sperm with normal shape
• Vitality — the percentage of sperm that are alive
• pH and other characteristics of the seminal fluid
• White blood cells, which may indicate infection

Because sperm production fluctuates, results can vary substantially between samples. If the first analysis is abnormal, at least one repeat test is usually done, ideally a few weeks apart, before drawing conclusions.

Hormone testing

Blood tests for testosterone, FSH, LH, and sometimes prolactin and thyroid hormones help distinguish testicular causes from pituitary or hypothalamic causes. The pattern of results often points clearly to where the problem lies.

Genetic testing

For men with very low sperm counts or azoospermia, current guidelines recommend genetic testing including karyotype (chromosome analysis), Y chromosome microdeletion testing, and cystic fibrosis gene testing if absence of the vas deferens is found. These tests help identify causes that cannot be reversed and inform discussions about the chance of passing conditions to children.

Imaging

Scrotal ultrasound can detect varicoceles that are not obvious on examination, evaluate testicular tissue, and look for cysts or tumours. Transrectal ultrasound is used in some cases of suspected obstruction in the deeper ducts.

Specialised sperm tests

In selected cases, advanced tests may be performed:

• Sperm DNA fragmentation testing — measures the integrity of the genetic material in sperm
• Anti-sperm antibody testing — checks whether the immune system is attacking sperm
• Post-ejaculation urinalysis — checks for retrograde ejaculation
• Testicular biopsy — rarely needed for diagnosis alone but may be done at the same time as sperm retrieval in azoospermia

Treatment and Management

Treatment depends entirely on the cause. For some men, a specific reversible problem is found and treated directly. For others, the underlying cause cannot be reversed, and treatment focuses on retrieving sperm and using assisted reproduction to achieve pregnancy. In couples with mild male factor findings and a healthy female partner, simpler treatments may be enough.

Lifestyle changes

For many men, addressing modifiable factors is the first step and can produce meaningful improvement in semen quality over three to six months — the time it takes for a new cycle of sperm to be produced. Measures commonly advised include:

• Stopping smoking
• Reducing or eliminating alcohol
• Stopping anabolic steroids or testosterone supplements (under medical guidance, as abrupt withdrawal has its own considerations)
• Achieving a healthy weight if overweight
• Avoiding excess heat exposure to the scrotum
• Reviewing medications with a doctor to see if any could be contributing
• Managing chronic conditions such as diabetes and high blood pressure

While certain antioxidant supplements have been studied for male infertility, the evidence is mixed. Major societies note that the benefit is uncertain and that supplementation should not delay evaluation of an underlying cause.

Treating specific medical conditions

Where a hormonal cause is identified, hormone treatment can sometimes restore sperm production. Men with hypogonadotropic hypogonadism (low signal from the pituitary) may respond well to gonadotropin injections, often over a course of many months. Thyroid disorders and high prolactin are treated directly. Infections are treated with appropriate antibiotics.

Some men with low-normal sperm parameters and certain hormonal patterns may be offered medications such as clomiphene or anastrozole, which aim to boost the body’s own testosterone and sperm production. The evidence for these is variable, and they are used selectively by specialists.

Varicocele repair

Surgical repair of a varicocele (varicocelectomy) is an option for men with a clinically detectable varicocele and abnormal semen parameters. The procedure ties off or blocks the abnormal veins, allowing the testis to function in a more normal temperature environment. Improvement in semen parameters is seen in many men over three to twelve months following surgery, although not in every case. Varicocele repair is one of the few interventions in male infertility that can sometimes restore the ability to conceive naturally.

Surgery for obstruction

When sperm production is normal but there is a blockage, surgical reconstruction may be possible. Vasovasostomy (reconnecting the vas deferens after a vasectomy) and vasoepididymostomy (connecting the vas deferens to the epididymis when there is a blockage closer to the testis) are microsurgical procedures performed by specialist urologists. Success depends on the cause of the obstruction, the time since it developed, and the surgeon’s experience.

Surgical sperm retrieval

When natural sperm delivery is not possible — either because of obstruction that cannot be repaired, or because of severely reduced production — sperm can be retrieved directly from the reproductive tract for use in IVF with ICSI (described below). Techniques include:

• PESA (percutaneous epididymal sperm aspiration) — a fine needle draws sperm from the epididymis
• TESA (testicular sperm aspiration) — a needle draws tissue and sperm from the testis
• TESE (testicular sperm extraction) — small samples of testicular tissue are surgically removed and examined for sperm
• Micro-TESE (microsurgical TESE) — an operating microscope is used to identify the most promising areas of the testis to sample; this is the preferred technique in non-obstructive azoospermia in many specialist centres

Retrieved sperm can be used immediately or frozen for future use.

Assisted reproductive techniques

When natural conception is not occurring despite treatment of identifiable causes, or where treatment cannot fully reverse the cause, assisted reproduction is used to bring sperm and egg together. The technique chosen depends on the severity of the sperm problem and on the female partner’s situation.

Intrauterine insemination (IUI): A prepared sample of sperm is placed directly inside the uterus around the time of ovulation. IUI can help in cases of mild male factor where there are enough motile sperm after preparation, and where the female partner has open fallopian tubes and is ovulating.

In vitro fertilisation (IVF): Eggs are retrieved from the female partner and combined with sperm in the laboratory. Resulting embryos are transferred to the uterus. Standard IVF requires reasonable sperm numbers and function.

Intracytoplasmic sperm injection (ICSI): A single sperm is injected directly into each egg in the laboratory. ICSI is commonly used by fertility specialists when sperm numbers are very low, motility is poor, or sperm have been surgically retrieved. It allows men with severe male factor infertility to have biological children, often using just a handful of sperm.

Donor sperm: When no sperm can be retrieved, or when there is a high risk of passing on a genetic condition, sperm from a screened donor can be used with IUI or IVF. This is a significant decision for many couples and is usually accompanied by counselling.

Sperm freezing (cryopreservation)

Sperm can be frozen and stored for future use. This is offered before treatments that may damage fertility (such as chemotherapy or certain pelvic surgeries), and is also used when sperm is retrieved surgically and not used immediately. Frozen sperm typically maintains good function for many years.

Sexual and Ejaculatory Function

Erectile dysfunction, premature ejaculation, retrograde ejaculation, and anejaculation can all interfere with conception even when sperm production is normal. Treatment depends on the cause:

• Erectile dysfunction may respond to oral medications, lifestyle changes, or treatment of underlying conditions such as diabetes
• Retrograde ejaculation can sometimes be managed with medication or by retrieving sperm from urine after ejaculation
• Anejaculation may be addressed with techniques such as penile vibratory stimulation or electroejaculation under specialist care

It is worth raising sexual function concerns openly with the treating doctor, even though it can feel uncomfortable. These issues are common and treatable, and addressing them is often part of the fertility plan.

Lifestyle and Self-Management

Beyond the specific lifestyle changes already discussed, there are general patterns that support male reproductive health during the time you are trying to conceive:

• Balanced diet rich in fruits, vegetables, whole grains, and lean protein, with adequate sources of zinc, selenium, and folate
• Regular moderate exercise — very intense or excessive exercise (such as long-distance cycling) may have small negative effects
• Adequate sleep, as sleep deprivation affects testosterone
• Managing stress, which can affect hormone balance and sexual function
• Limiting heat exposure — loose-fitting underwear during the fertility window is often advised, although the evidence for fabric choice is modest
• Frequency of intercourse — every two to three days throughout the cycle is usually advised, rather than trying to time intercourse precisely to ovulation

Monitoring and Follow-up

During treatment for male infertility, follow-up usually includes:

• Repeat semen analyses at intervals appropriate to the treatment (for example, three months after lifestyle changes, three to six months after varicocele surgery)
• Hormone checks if medical treatment is being used
• Coordination with the female partner’s evaluation and treatment
• Discussion of when to move from one treatment approach to another, particularly the decision about when to consider IVF/ICSI

Decisions about when to escalate to more advanced treatments depend on the couple’s age, the duration of trying, the underlying cause, and shared preferences. There is no single correct timeline; this is something a fertility specialist will help map out.

Complications and Other Health Considerations

Male infertility is not only a reproductive issue. Research over the past two decades has shown that men with infertility may have a slightly higher risk of certain other health conditions, including:

• Testicular cancer (a small but real association, which is why testicular examination is part of the workup)
• Hormonal disorders, including low testosterone in later life
• Certain genetic conditions that have wider health implications
• Cardiovascular and metabolic conditions in some studies

For this reason, current AUA/ASRM guidance suggests that the fertility evaluation is also an opportunity to address general men’s health. Men diagnosed with male infertility benefit from ongoing primary care follow-up, even after the fertility journey is complete.

Living with Male Infertility

The emotional side of male infertility is often underestimated. Many men feel a strong sense of personal responsibility, guilt, or inadequacy when a male factor is identified. Cultural expectations around fatherhood and masculinity can make it difficult to talk about openly, even with close family or with the partner.

Some patterns that may help during this period:

• Recognising that infertility is a medical condition, not a personal failing
• Talking openly with your partner about the process, the decisions, and the emotions involved
• Considering professional counselling, which is available and often very helpful — specialist fertility counsellors work with both partners
• Connecting with others going through similar experiences, through support groups or trusted communities
• Being honest with the medical team about how you are coping

The treatment journey can stretch over months or years. Pacing yourselves, taking breaks when needed, and protecting other parts of life that bring meaning are all reasonable.

Outlook

The outlook in male infertility varies widely with the cause. Many men with mild to moderate problems achieve pregnancy through targeted treatment of an identifiable cause, lifestyle change, or simpler assisted reproductive techniques. For men with severe male factor — including azoospermia — the development of ICSI and surgical sperm retrieval techniques has transformed the field, allowing many men who would previously have had no biological options to father children.

That said, not every couple succeeds, and a small proportion of cases of male infertility are not currently treatable in a way that produces a biological child. In these situations, donor sperm and adoption are options that couples may explore, often with counselling support. The right path is highly individual and depends on the couple’s values and circumstances.

Frequently Asked Questions

Can male infertility be cured?

It depends on the cause. Some causes — such as hormonal deficiencies, certain infections, varicoceles, and reversible lifestyle factors — can be treated in ways that restore fertility, sometimes to the point that natural conception becomes possible. Other causes, particularly genetic ones, cannot be reversed, but pregnancy may still be achieved using surgical sperm retrieval and ICSI.

Does taking testosterone affect fertility?

Yes, significantly. Testosterone supplements and anabolic steroids signal the brain to stop sending the hormones (FSH and LH) that drive natural sperm production. This often results in very low sperm counts or no sperm at all. The effect is usually reversible after stopping, but recovery can take many months and is not guaranteed. Men trying to conceive are generally advised to avoid testosterone supplementation and discuss alternatives with their doctor.

How long does it take to see improvement after treatment?

Because a full cycle of sperm production takes around three months, most treatments that affect sperm production are reassessed by semen analysis at three months or later. Improvement after varicocele surgery may continue out to six to twelve months. Some hormone treatments require six to twelve months of consistent use before sperm appear in the ejaculate.

Does a normal semen analysis rule out a male factor?

Not entirely. A normal analysis is reassuring, but some men with normal numbers and motility still have functional sperm problems, including DNA damage, that can affect fertilisation and embryo development. If pregnancy is not occurring despite a normal female evaluation and a normal semen analysis, additional sperm function testing may be considered.

Is male infertility hereditary?

Some causes are. Y chromosome microdeletions, for example, can be passed to male offspring conceived through ICSI, who may then have similar fertility issues. Genetic counselling is recommended where a genetic cause is identified, so couples can make informed decisions.

Can age affect male fertility?

Yes, although the decline is more gradual than in women. Sperm count usually remains adequate into older age, but sperm DNA quality decreases, and the chance of conception per cycle declines. Advanced paternal age is also associated with a small increase in certain conditions in offspring.

Will frequent ejaculation help or hurt?

Very frequent ejaculation can transiently reduce sperm count, but very long periods of abstinence are not better either, as sperm quality declines with prolonged storage. Most guidance suggests intercourse every two to three days throughout the female partner’s cycle as a balanced approach.

Are over-the-counter fertility supplements worth taking?

The evidence for antioxidant and multivitamin supplements in male infertility is mixed. Some studies have shown small improvements in semen parameters, but high-quality evidence for improved pregnancy rates is limited. Major societies note that supplements should not delay evaluation of an underlying cause. If you are considering supplements, discuss them with your treating doctor.

What if no cause is found?

Idiopathic male infertility — abnormal semen results with no identifiable cause — is common. In this situation, treatment focuses on optimising health, addressing the female partner’s evaluation, and choosing an appropriate level of assisted reproduction based on the severity of findings and the couple’s circumstances.

Conclusion

Male infertility is common, often treatable, and almost always navigable with the right evaluation and team. The path from initial diagnosis to pregnancy can be straightforward in some cases and prolonged in others, but for the great majority of couples there are meaningful options. A thorough evaluation by a urologist with fertility experience, coordinated with the female partner’s care, gives the clearest picture of what is causing the difficulty and what choices are available.

Whether the next step is a lifestyle change, a course of medication, a surgical procedure, or moving directly to assisted reproduction, decisions are best made in partnership with a fertility team that knows your full situation and shares the goal of helping you build the family you want.