Male infertility means a man's sperm quality, quantity, or delivery is contributing to a couple's difficulty conceiving after a year of trying. It's common and often treatable — frequently linked to a varicocele (enlarged veins in the scrotum) that affects sperm production.
Male factors contribute to about half of all infertility cases — solely responsible in roughly 20%, and a contributing factor in another 30–40% (NIH/NICHD). A varicocele affects 15% of all men but 35–40% of men with primary infertility (AUA/ASRM, cross-checked with NIH).
Causes & risk factors
- Varicocele — the most common correctable cause
- Low sperm count or poor sperm motility/shape
- Hormonal imbalances
- Genetic conditions (e.g. Klinefelter syndrome) or blocked/absent reproductive ducts
- Infections such as epididymitis, orchitis, or STIs
- Lifestyle factors: obesity, smoking, heat exposure, diabetes
Symptoms to watch for
- Often no obvious symptoms at all — infertility itself may be the only sign
- Scrotal swelling, lump, or heaviness (possible varicocele)
- Reduced sexual desire or erectile difficulty
- Small, firm testicles
- Testicular pain/swelling, or signs of hormonal imbalance — warrants prompt evaluation
How it's diagnosed
- Semen analysis (sperm count, motility, shape) — the core test
- Physical examination to check for a varicocele
- Hormone blood tests
- Scrotal ultrasound
- Genetic testing/karyotyping in select cases
Treatment options
- Lifestyle changes: weight loss, quitting smoking, and avoiding heat exposure can improve semen parameters.
- Medication: to correct underlying hormone imbalances.
- Microsurgical varicocelectomy: a microscope-guided procedure to tie off enlarged veins — the first-line, most effective repair for varicocele-related infertility per AUA/ASRM guidelines.
- Surgical sperm retrieval: for men with blockages or absent ducts.
- Assisted reproductive technology (IVF/ICSI): when other treatments aren’t sufficient on their own.
Outlook & prevention
Many men see meaningful improvement in semen quality after treating a varicocele or making lifestyle changes, improving natural conception chances. Even when an underlying cause can't be fully corrected, modern techniques like IVF/ICSI offer a proven path to parenthood.
- Unable to conceive after 1 year of regular unprotected intercourse (or 6 months if the female partner is over 35)
- A scrotal lump, pain, or swelling
- History of testicular injury, surgery, or an undescended testicle