What Is Andrology? The Medical Specialty for Male Health

Andrology is the medical specialty focused on conditions specific to the male reproductive and sexual system, often described as the male counterpart to gynecology. The field covers a wide range of problems, from infertility and erectile dysfunction to hormonal disorders and structural abnormalities of the penis. The term itself has been in use for over a century, though it was independently revived in Europe in the mid-twentieth century and gained formal academic footing when the first international journal of andrology was founded in Germany in 1969.¹ Despite its long history, andrology remains unfamiliar to many people, and male reproductive health is frequently underserved compared to its female equivalent.

What Andrologists Actually Treat

A global survey of andrology practitioners found that the primary areas of practice are male infertility (about 37% of clinical work), male sexual dysfunction (about 27%), and sexually transmitted infections (roughly 15%).² Many andrologists are also actively involved in assisted reproductive technologies, imaging, and surgical emergencies involving the male reproductive tract. Depending on the country, andrologists come from different training backgrounds: some are urologists who subspecialized, others are endocrinologists, and in some systems there is a dedicated andrology training pathway. The unifying thread is a focus on male-specific reproductive and sexual problems that fall between the cracks of broader specialties.

Male Infertility and Why It Matters More Than People Think

Infertility affects roughly 15–20% of couples trying to conceive, and male factors contribute to about half of those cases.³ That statistic tends to surprise people, because the cultural assumption is still that infertility is primarily a female issue. In reality, about 7% of all men experience some degree of impaired fertility, and testicular failure is the single largest category of causes.⁴ Genetic factors account for roughly 15–20% of the most severe forms, but in about half of all cases, the underlying cause remains unknown.⁵

The diagnostic workup typically starts with a semen analysis, which remains the cornerstone of male fertility evaluation. The World Health Organization publishes standardized reference values for sperm count, motility, and morphology, and clinics worldwide follow those guidelines.⁶ A semen analysis alone rarely tells the whole story, though. Blood hormone levels, genetic testing, and imaging often follow, especially when sperm counts are very low or absent. The clinical approach to the male partner is not uniformly standardized across international guidelines, which means the quality and thoroughness of the evaluation you receive can vary widely depending on where you seek care.³

Assisted Reproduction for Severe Male Infertility

For men with no sperm in the ejaculate, either because of a blockage or severely impaired sperm production, andrologists can retrieve sperm directly from the testicles using surgical techniques. Testicular sperm extraction, or TESE, is one such method, and when combined with intracytoplasmic sperm injection (ICSI), it allows even men previously considered irreversibly infertile to father genetically related children.⁷ ICSI works by injecting a single sperm cell directly into an egg, bypassing all the natural barriers that normally require healthy sperm function.⁸

A more refined version called micro-TESE uses a surgical microscope to find pockets of sperm-producing tissue in the testicle. Comparative studies have found that ICSI outcomes are similar regardless of whether the sperm was collected via micro-TESE, aspiration, or from an ejaculate with very low concentrations, confirming that micro-TESE is an effective tool for severe cases.⁹ These procedures sit squarely within the andrologist’s domain and represent one of the more dramatic success stories in male reproductive medicine over the past few decades.

Erectile Dysfunction as a Vascular Signal

Erectile dysfunction is a core condition in andrology and affects a substantial share of men, particularly with age. The mechanism behind an erection depends heavily on nitric oxide, a signaling molecule released by nerve and blood vessel cells in the penis. Nitric oxide triggers a chemical chain that relaxes the smooth muscle in the erectile tissue, allowing blood to flow in and create rigidity. When that signaling pathway is impaired, the result is erectile dysfunction.¹⁰

What makes this more than a bedroom problem is that the same vascular damage responsible for erection difficulties often signals broader cardiovascular trouble. Conditions like high blood pressure, diabetes, smoking, and high cholesterol all damage blood vessel lining throughout the body, and the penile arteries, being small, tend to show dysfunction earlier than larger vessels.¹¹ An andrologist evaluating erectile dysfunction is, in effect, screening for systemic vascular health. The medications most people associate with this condition, like PDE5 inhibitors, work by amplifying that same nitric oxide signaling pathway.¹²

Testosterone Deficiency and Replacement

Low testosterone, clinically called hypogonadism, is another major area of andrological practice. Symptoms include reduced sex drive, erectile problems, fatigue, loss of muscle mass, depression, and thinning bones. The condition can originate from the brain’s signaling system, from the testes themselves, or from a combination of both, which becomes increasingly common as men age.¹³ One complicating factor is that the degree of testosterone decline does not always match the severity of symptoms, which makes diagnosis less straightforward than a simple blood test might suggest.¹⁴

Testosterone replacement therapy has been a subject of intense debate, particularly around cardiovascular safety. A large randomized trial published in the New England Journal of Medicine found that in men with low testosterone who already had or were at high risk for heart disease, testosterone therapy was not associated with a higher rate of major cardiac events compared to placebo.¹⁵ However, the same trial did observe a higher incidence of atrial fibrillation, acute kidney injury, and pulmonary embolism in the testosterone group. A population-based cohort study offered a more nuanced picture: short-term testosterone use was associated with increased risk of death and cardiovascular events, while long-term use was associated with reduced risks of both.¹⁶ Preclinical and clinical data also suggest testosterone has some beneficial metabolic effects, including improved blood sugar control, fat reduction, and blood vessel relaxation, though its relationship with blood clotting and inflammation is more ambiguous.¹⁷

Prostate Conditions and Their Impact on Sexual Function

Benign prostatic enlargement is extremely common in older men, and its treatment sits at an intersection between urology and andrology because of the direct effects on sexual health. The standard medications used to manage an enlarged prostate can have side effects that men care about deeply. One class of drugs, 5-alpha-reductase inhibitors, carries a meaningful risk of erectile dysfunction, ejaculatory problems, and reduced libido. Another class, alpha-blockers, generally has less impact on erections and desire, although one specific drug in that class (tamsulosin) is associated with ejaculatory dysfunction in about 10% of users.¹⁸

Surgical treatments for an enlarged prostate effectively relieve urinary symptoms, but they often come with significant effects on sexual function, including both erectile and ejaculatory changes.¹⁹ Newer, less invasive procedures such as UroLift, Rezum, and prostatic artery embolization carry lower sexual dysfunction risk but also provide less improvement in urinary symptoms compared to traditional surgery. One exception is Aquablation, which appears to match traditional resection for symptom relief while causing much less ejaculatory dysfunction.²⁰ The takeaway for patients is that this is always a trade-off conversation, and an andrological perspective ensures sexual outcomes are weighed alongside urinary ones.

Adolescent Andrology and Varicocele

Andrology is not exclusively an adult specialty. One of the most common findings on a routine physical exam in teenage boys is a varicocele, which is an enlargement of the veins inside the scrotum. While varicoceles rarely cause symptoms in the moment, there is a clear association between varicoceles and future male infertility.²¹ Research comparing semen quality in adolescents has found that the sperm of young men with varicocele resembles that of young men with bilateral undescended testicles more closely than it resembles normal samples, which is a concerning finding that has pushed some clinicians toward earlier intervention.²²

The challenge is deciding who needs surgery and when. Current thinking favors intervention for adolescents with measurable testicle size differences, abnormal semen parameters, or bilateral palpable varicoceles. Microsurgical varicocelectomy has shown benefits for testicular growth and semen quality, though the ultimate impact on future fertility is still being studied.²³ Untreated varicoceles can cause progressive damage, so individualized treatment planning matters. This is precisely the kind of nuanced, long-horizon clinical decision that justifies a specialty perspective rather than a general one.

Lifestyle, Environment, and Sperm Quality

Beyond genetics and anatomy, andrologists increasingly deal with the effects of modern life on the male reproductive system. Smoking, heavy drinking, obesity, chronic stress, sedentary habits, and excessive heat exposure all appear to harm sperm production through multiple pathways.²⁴ Environmental pollutants also play a role, though the evidence is more convincing for occupational exposures (industrial chemicals, traffic exhaust, agricultural pesticides in high-dose settings) than for the trace-level exposures most people encounter in daily life.²⁵

A sedentary, Western-style lifestyle appears to be genuinely damaging to sperm production. Obesity, in particular, is linked to hormonal disruptions that lower testosterone and impair sperm quality. The practical implication is that a conversation with an andrologist often involves lifestyle counseling alongside medical treatment. Weight loss, exercise, smoking cessation, and moderating alcohol intake can all improve semen parameters even before any medication is introduced.

Peyronie’s Disease and Structural Penile Problems

Peyronie’s disease involves the formation of scar tissue, or plaque, inside the penis, leading to curvature, pain, and in many cases difficulty with penetration. Andrologists manage both the acute phase, when the plaque is still forming, and the stable phase, when the curvature has stopped changing. In the early stage, treatment tends to be conservative, including injections directly into the plaque. Surgery is generally reserved for men who have not responded to other therapies for about a year and cannot have satisfactory sexual intercourse.²⁶ The condition is more common than most men realize, and embarrassment often delays diagnosis. It is a good example of a problem that sits entirely within andrology’s domain and would not be caught by routine general care unless a patient volunteers the information.

The Psychological Toll of Male Reproductive Problems

One of the more underrecognized aspects of andrology is the psychological burden that reproductive problems place on men. Research consistently shows that male infertility is associated with depression, anxiety, reduced self-esteem, and a sense of damaged masculine identity.²⁷ These effects are not limited to men whose infertility has a diagnosed male cause. Systematic analysis has found that the experience of infertility itself, regardless of which partner the cause is attributed to, negatively affects men’s mental health.²⁸

Men undergoing fertility treatment tend to adopt avoidant coping strategies and often suppress their emotions rather than seeking support. Treatment failure can lead to grief, feelings of inadequacy, and relationship strain. Couple separation has been noted as a common reason for discontinuing male infertility treatment altogether.²⁹ Despite all this, psychological support for the male partner remains limited within most fertility clinics, which primarily focus on the woman. The evidence supports routine psychosocial screening for men dealing with severe infertility, particularly after surgical treatment failures.

Fertility Preservation Before Cancer Treatment

Oncoandrology is a growing subfield dealing with the reproductive consequences of cancer treatment. Chemotherapy, radiation, and certain surgeries can permanently damage sperm production. Current guidelines from the American Society of Clinical Oncology recommend that sperm cryopreservation (sperm banking) should be offered to males before cancer-directed treatment begins.³⁰ For men who cannot provide a semen sample, testicular sperm extraction is an option. For prepubertal boys, the only available approach is testicular tissue cryopreservation, which is still experimental and should only be done in a clinical trial setting. The time pressure of a cancer diagnosis makes early referral to an andrologist critical, since every day of delay before treatment begins is a day that could have been used for preservation.

Paternal Age and Offspring Health

There is growing recognition that the father’s age at conception matters for offspring health in ways that were largely overlooked until recently. Advancing paternal age is linked to accumulating genetic mutations in sperm, chromosomal abnormalities, and epigenetic changes that may silence important genes.³¹ Evidence increasingly suggests that older fathers pass along a higher vulnerability to certain inheritable conditions. While the risks are small in absolute terms for any individual, the trend is consistent enough that andrologists factor paternal age into fertility counseling, particularly as more men delay fatherhood into their 40s and beyond.

Male Contraception Research

Beyond condoms and vasectomy, options for male contraception have historically been nonexistent. That is slowly changing. Several hormonal male contraceptive agents have entered clinical trials, including novel compounds delivered as oral pills or transdermal gels. The most advanced candidate is a combined progestogen-testosterone gel currently in a phase 2b efficacy trial.³² On the non-hormonal side, researchers have identified targets that affect sperm production, motility, and transport, and at least one compound, a retinoic acid receptor antagonist, has entered first-in-human trials.³³

Reversible vas-occlusive methods, sometimes described as a “reversible vasectomy,” are also in development. The concept involves blocking the vas deferens with a material that can later be dissolved, rather than cutting and sealing the tube permanently. Early-stage research on this approach is underway.³⁴ None of these methods are available for general use yet, but the pipeline is the most active it has ever been, and andrology is the specialty driving the clinical side of that work.

Why Men Avoid Reproductive Healthcare

One of the biggest challenges facing andrology as a field is simply getting men through the door. Research on barriers to help-seeking has identified three consistent themes: rigid ideas about male gender roles that frame medical vulnerability as weakness, fear of medical procedures and diagnoses, and embarrassment around discussing sexual or reproductive symptoms with professionals.³⁵ In some cultural contexts, these patterns are reinforced by health systems that are not designed to be welcoming to men seeking reproductive care, leading men to self-treat, conceal problems, or rely on non-medical providers.³⁶ The result is that many conditions go undiagnosed until they have progressed significantly or until a couple’s struggle with infertility forces the issue. Greater awareness that andrology exists as a specialty, and that male reproductive health is a legitimate medical concern, is one of the simplest ways to close that gap.