Male infertility contributes to roughly half of all cases where a couple cannot conceive, yet it is often the last factor to be investigated. If you and your partner have been trying for a year without success, the cause is as likely to sit with the man as with the woman. This guide explains the main causes of male infertility, the signs worth checking, and the treatment options that help, from simple lifestyle changes to ICSI.
Key Takeaways
- → Male factors contribute to about half of all infertility cases, and around 1 in 6 people worldwide face infertility (WHO, 2023).
- → Low sperm count, weak motility and abnormal shape are the most common findings on a semen analysis.
- → Varicocele is the most common surgically correctable cause, found in up to 44 percent of men with primary infertility.
- → Smoking, alcohol, excess weight and heat exposure lower sperm quality, but many of these effects are reversible.
- → Treatment ranges from lifestyle changes and medication to varicocele repair, IUI and ICSI for severe male factor.
What Is Male Infertility and How Common Is It?
Infertility affects about 17.5 percent of adults worldwide, roughly 1 in 6 people, according to the World Health Organization (WHO) (2023). Male infertility describes any condition that lowers a man’s chance of making a partner pregnant, usually through low sperm count, weak sperm movement or abnormally shaped sperm.
Male factors are involved in about half of all infertility cases. India’s Indian Council of Medical Research (ICMR) notes that a male factor is contributory in around 50 percent of cases and solely responsible in about 20 percent. Infertility is not one partner’s problem: it is a shared medical issue best assessed together.
Many couples assume the woman should be tested first, and that habit delays diagnosis. When both partners are assessed at the same time, treatment starts sooner, which matters because success rates fall with age. For the female side of the picture, see our guide to PCOS and pregnancy.
What Are the Most Common Causes of Male Infertility?
Varicocele, an enlarged vein inside the scrotum, is the most common surgically correctable cause of male infertility. It appears in about 15 percent of men overall and in 35 to 44 percent of men with primary infertility, which is why the American Society for Reproductive Medicine (ASRM) recommends a scrotal examination in every male fertility assessment.
The causes fall into three broad groups. Sperm production problems come from hormonal imbalance, genetic conditions, infections or heat damage. Sperm delivery problems come from blockages, previous surgery or ejaculation disorders. Lifestyle and environmental causes include smoking, alcohol, obesity, anabolic steroids, and long exposure to heat or toxins.
For many men, no single cause is found, and that is normal. Unexplained male factor still responds to treatment, so a missing label does not mean a missing option.
How Is Male Infertility Diagnosed?
A semen analysis is the first and most important test, and it is usually repeated to confirm any abnormal result. The WHO publishes the reference limits used by laboratories worldwide, and the 2021 sixth edition values are the current benchmark. A result at or above each limit sits within the reference range.
| Parameter | WHO 2021 reference limit | What it measures |
|---|---|---|
| Semen volume | 1.4 mL or more | Fluid released with each ejaculate |
| Sperm concentration | 16 million per mL or more | How densely sperm are packed in the fluid |
| Total sperm number | 39 million per ejaculate or more | Total sperm released per sample |
| Total motility | 42 percent or more | Share of sperm that are moving |
| Progressive motility | 30 percent or more | Share swimming in a forward direction |
| Normal forms | 4 percent or more | Share with a normal shape |
A single number rarely tells the whole story. Specialists look at the pattern across all parameters, along with hormone tests and a physical examination. Our overview of male infertility care at our clinic explains what the assessment involves.
Concerned about a sperm test result? Get a clear plan from our fertility team.
What Are the Treatment Options for Male Infertility?
Treatment usually starts with the simplest option that can work and moves up only if needed. Lifestyle changes come first, followed by medication, surgery, and finally assisted reproduction such as IUI or ICSI when sperm quality is severely reduced or sperm cannot be released normally.
| Treatment | How it helps | Usually considered for |
|---|---|---|
| Lifestyle changes | Removes damaging habits so sperm production can recover | Smoking, alcohol, excess weight, heat exposure |
| Medication | Corrects a hormonal imbalance or treats an infection | Low hormone levels, genital infection |
| Varicocele repair | Restores blood flow and can raise sperm count and motility | Palpable varicocele with abnormal semen |
| Surgical sperm retrieval | Collects sperm directly when none appear in the ejaculate | Azoospermia, meaning no sperm in the sample |
| IUI | Places prepared sperm in the uterus near ovulation | Mild male factor with a healthy female factor |
| IVF with ICSI | Injects a single sperm directly into a mature egg | Severe low count, poor motility, retrieved sperm |
ICSI is the strongest option for severe male factor because it needs only one healthy sperm per egg. Our IUI treatment guide explains when the gentler option is a better first step, and our guide to IVF treatment in Karimnagar covers how ICSI is planned when sperm numbers stay low.
Lifestyle Changes That Improve Sperm Health
Sperm take roughly 74 days to mature, so any lifestyle change needs about two to three months before it shows up in a test. Smoking, heavy alcohol use, vaping and anabolic steroids all reduce fertility, and obesity lowers the number of healthy sperm, according to the European Society of Human Reproduction and Embryology (ESHRE).
Focus on a few changes that carry the strongest evidence. Stop smoking and vaping, keep alcohol low, work toward a healthy weight, and stay physically active. Avoid prolonged heat from laptops on the lap, tight clothing, hot baths and saunas, because the scrotum works best slightly cooler than the body. Eat more fruit, vegetables and whole grains, since a diet high in saturated fat is linked to lower sperm production.
Men often ask whether supplements help. Some antioxidants show modest benefit, but they work best on top of the basics, not instead of them. Tell your doctor about every medicine you take, because some prescription drugs harm sperm.
When Should You See a Fertility Specialist?
You should seek assessment after 12 months of regular unprotected sex without conception, or after 6 months if your partner is over 35. See a specialist sooner if there is a known risk factor, such as a history of testicular surgery, cancer treatment, a previous undescended testis, or a very low sperm result on an earlier test.
Both partners should be assessed, because male and female factors often overlap. The ICMR sets national standards for evaluating infertility, and a specialist applies those standards rather than treating one result in isolation. If you are looking for experienced care close to home, our guide to the fertility specialists in Karimnagar explains what to expect at a first consultation.
Male Fertility and Overall Health
Sperm quality can act as a window on wider health. Research published in the Journal of Clinical Medicine (2024) links poorer male fertility with a higher chance of other conditions later in life, which is why male infertility is now treated as a health marker rather than an isolated problem.
This is worth taking seriously. A fertility assessment can surface an undiagnosed hormonal or metabolic issue early, when it is easier to manage, which supports both your chances of conception and your long-term health.
Next Steps Toward Parenthood
Male infertility is common, usually treatable, and never a reason to give up on a family. Start with a proper assessment, correct anything that can be corrected, and move through the treatment ladder only as far as you need to. Most couples find a clear path once both partners are tested and a plan is in place.
At Atom Fertility Center in Karimnagar, our team evaluates both partners, explains every option in plain language, and builds a plan around your values. If you have been trying without success, an early consultation is the single most useful step you can take.
Ready to find out what is holding things up? Our fertility team can help.
