When a couple struggles to conceive, the conversation often centres on the woman — her cycles, her hormones, her ovarian reserve. But male infertility causes nearly 50% of all infertility cases globally, and in India, the numbers are sobering: studies indicate that only about one in four Indian men meets normal semen parameters, and average sperm counts have fallen by an estimated two-thirds over the past three decades. This is not a fringe problem. It is a silent, rising public health issue — and one that remains significantly under-discussed in clinical settings. This article breaks down the real male infertility causes, what affects sperm health, and when couples should stop waiting and seek professional evaluation.

Understanding Male Infertility: The Basics

Male infertility is defined as the inability to father a biological child after 12 months of regular, unprotected intercourse. It is almost always diagnosed through a semen analysis — a test that evaluates three core parameters:

Parameter	Normal Range (WHO 2021)	What It Means
Sperm concentration	≥16 million/mL	Number of sperm per ejaculate
Sperm motility	≥42% total motility	Percentage that can swim
Sperm morphology	≥4% normal forms	Percentage of normal shape

Abnormalities in one or more of these parameters are the most common finding in infertile men. The condition is classified as:

• Oligospermia — low sperm count (below 16 million/mL)
• Asthenospermia — poor sperm motility
• Teratospermia — abnormal sperm shape/morphology
• Azoospermia — complete absence of sperm in ejaculate (affects ~1% of all men and ~10–15% of infertile men)

The Main Male Infertility Causes

1. Varicocele — The Most Treatable Cause

Varicocele is an abnormal enlargement of veins within the scrotum — essentially varicose veins of the testicles. It is found in approximately 40% of men with primary infertility and up to 80% of those with secondary infertility (inability to conceive again after a previous pregnancy). It reduces sperm health by raising scrotal temperature and impairing blood flow, which damages sperm production and DNA integrity. Crucially, varicocele repair (varicocelectomy) is one of the most effective surgical interventions in male infertility, with evidence showing significant improvement in sperm count and motility post-correction.

2. Hormonal Imbalances

The hypothalamic-pituitary-gonadal (HPG) axis controls testosterone and sperm production. Disruptions anywhere in this chain affect fertility:

• Low testosterone directly reduces sperm production
• Elevated prolactin suppresses the pituitary signals that drive sperm development
• Low anti-Müllerian hormone (AMH) in men has been linked to higher sperm DNA fragmentation — a relatively recent finding from a 2025 Indian study (Oncoscience)
• Thyroid disorders — both hypo- and hyperthyroidism — can impair sperm motility and morphology

3. Lifestyle Factors: The Modifiable Causes

A 2025 study published in Oncoscience of 278 Indian men aged 21–50 found strong associations (p < 0.001) between lifestyle factors and poor semen parameters:

• Tobacco use — reduced sperm concentration, motility, and morphology
• Alcohol consumption — reduced sperm quality and increased DNA fragmentation
• Obesity/underweight — both extremes associated with lower semen quality and greater DNA damage
• Occupational heat exposure — men in high-temperature work environments had significantly more sperm DNA damage

Chronic psychological stress — increasingly prevalent in urban India's working population — is also independently associated with reduced testosterone and worsened semen quality.

4. Infections and Obstructions

Past or current infections can impair sperm production or block the reproductive tract:

• Mumps orchitis — a mumps infection that reaches the testicles can cause irreversible testicular damage
• Sexually transmitted infections (STIs) such as chlamydia and gonorrhoea can cause epididymal scarring, leading to obstructive azoospermia
• Tuberculosis — still relevant in India — can affect the genitourinary tract

5. Genetic Causes

• Klinefelter syndrome (47,XXY) — the most common genetic cause of male infertility
• Y chromosome microdeletions — affect ~10–15% of men with severe oligospermia or azoospermia
• Cystic fibrosis gene mutations — associated with absence of the vas deferens (congenital bilateral absence of the vas deferens, CBAVD)

Genetic causes cannot be treated but are important to diagnose — both for understanding prognosis and for counselling couples about assisted reproduction options.

6. Environmental and Occupational Exposures

Endocrine-disrupting chemicals (EDCs) — found in plastics (BPA), pesticides, industrial solvents, and certain personal care products — interfere with hormone signalling and reduce low sperm count and motility. Heavy metal exposure (lead, cadmium, mercury) and excessive radiation also fall in this category.

What Tests Diagnose Male Infertility?

Test	What It Detects
Semen analysis	Sperm count, motility, morphology
Sperm DNA Fragmentation Index (DFI)	Hidden DNA damage in sperm
Hormonal panel (FSH, LH, testosterone, prolactin, TSH)	Hormonal causes
Scrotal ultrasound	Varicocele, testicular abnormalities
Genetic karyotyping / Y-deletion	Chromosomal causes
Post-ejaculate urinalysis	Retrograde ejaculation

A basic semen analysis is the starting point — but a normal result does not fully rule out male factor issues. Sperm DNA fragmentation can be elevated even when count and motility appear normal, and this is increasingly recognised as a cause of unexplained infertility and recurrent miscarriage.

Male Infertility Treatment in India: What Are the Options?

Many causes of male infertility are reversible or manageable:

• Varicocele repair — can improve sperm parameters significantly in 50–70% of cases
• Hormonal therapy — corrects hypogonadism, elevated prolactin, thyroid disorders
• Lifestyle changes — quitting tobacco, reducing alcohol, weight normalisation, stress management
• Antibiotics — treat underlying genital tract infections
• Surgical sperm retrieval (TESA/PESA) + IVF/ICSI — for obstructive or non-obstructive azoospermia
• ICSI (Intracytoplasmic Sperm Injection) — fertilises an egg with a single sperm, making it the primary ART solution when sperm count or motility is severely impaired

Male infertility treatment in India has advanced significantly — couples no longer have to resign themselves to IVF as the only route. The right treatment depends entirely on the underlying cause, which is why proper diagnosis comes first.

When Should You Seek Help?

Situation	Recommended Action
Trying to conceive for 12+ months (under 35)	Consult a fertility specialist — both partners
Trying to conceive for 6+ months (35 or older)	Seek evaluation sooner
Known risk factors (varicocele, past infection, low testosterone)	Don't wait 12 months — consult early
History of testicular injury, orchitis, or surgery	Proactive semen analysis recommended
Recurrent miscarriage (even with confirmed pregnancies)	Sperm DNA fragmentation testing warranted

Male infertility is not a reflection of masculinity or overall health — it is a medical condition with identifiable causes and, in most cases, workable solutions. The sooner it is evaluated, the more options remain available.

Consult a Fertility Specialist in Malad West, Mumbai

If you and your partner have been trying to conceive without success, or if you have any of the risk factors above, a comprehensive fertility evaluation — including semen analysis for the male partner — is the right first step. Dr. Shernaz Damkevala (Dastur) provides evidence-based fertility consultations at Ahura Nursing Home, Malad West, Mumbai. As a fertility specialist in Malad West with extensive experience in both female and couple-level infertility workups, Dr. Shernaz can guide you through the right diagnostic pathway and connect you with specialist care for the male factor when indicated. Also explore: Fertility Services | IVF & Assisted Reproduction | PCOS Management | Egg Freezing

FAQs 

Q1. What are the most common male infertility causes?

A: The most common causes are varicocele, low sperm count (oligospermia), hormonal imbalances, lifestyle factors (smoking, alcohol, obesity), and infections that cause obstructions.

Q2. What is a normal sperm count?

A: Per WHO 2021 guidelines, a normal sperm concentration is ≥16 million per millilitre. Below this is classified as oligospermia.

Q3. What is azoospermia?

A: Azoospermia is the complete absence of sperm in semen. It affects about 1% of all men and 10–15% of infertile men. It can be obstructive (blockage) or non-obstructive (production failure).

Q4. Can low sperm count be treated?

A: Yes. Depending on the cause, low sperm count can be treated with lifestyle changes, hormonal therapy, varicocele surgery, or assisted reproduction (IVF/ICSI).

Q5. Does smoking affect male fertility?

A: Yes. Tobacco use is strongly associated with reduced sperm concentration, motility, and morphology, as well as increased sperm DNA fragmentation.

Q6. What is a semen analysis test?

A: It is a lab test that evaluates sperm count, motility, morphology, and semen volume. It is the first and most important test for male infertility evaluation.

Q7. What is sperm DNA fragmentation?

A: It is damage to the genetic material within sperm. High DNA fragmentation can cause failed fertilisation, poor embryo quality, and recurrent miscarriage — even when the basic semen analysis appears normal.

Q8. How long should couples try before seeking help?

A: If under 35, try for 12 months before consulting. If over 35, or if there are known risk factors (varicocele, infections, hormonal issues), seek evaluation after 6 months or sooner.

Q9. Is male infertility treatment available in India?

A: Yes. Male infertility treatment in India includes hormonal therapy, varicocele repair, antibiotics for infections, and surgical sperm retrieval with IVF/ICSI for severe cases.

Q10. Can stress cause male infertility?

A: Chronic stress reduces testosterone levels and has been associated with poorer semen quality. While it is rarely the sole cause, it is a meaningful contributing factor.

CITATIONS & REFERENCES

1. Medical Dialogues (2025) — Male infertility in Indian men linked to lifestyle choices and hormonal imbalances — https://medicaldialogues.in/amp/medicine/news/male-infertility-in-indian-men-linked-to-lifestyle-choices-and-hormonal-imbalances-study-156791
2. Omnicuris (2026) — The Male Infertility Crisis: Understanding India's Silent Shift — https://www.omnicuris.com/medshots/daily_updates/male-infertility-trends-india-semen-parameters
3. The Quint (2025) — 'Lifestyle Factors, Delayed Fatherhood': Why Male Infertility Is Rising in India — https://thequint.com/fit/male-infertility-increasing-incidence-in-india-what-causes-it-explained
4. Frontiers in Reproductive Health (2025) — Male factor infertility study — https://public-pages-files-2025.frontiersin.org/journals/reproductive-health/articles/10.3389/frph.2025.1697925/epub
5. WHO (2021) — WHO Laboratory Manual for the Examination and Processing of Human Semen, 6th Edition — https://www.who.int/publications/i/item/9789240030787
6. Urological Society of India — Male Infertility Guidelines — https://medicaldialogues.in/urology/guidelines/male-infertility-urological-society-of-india-guidelines-108542