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Male Fertility: Sperm Health, Causes of Infertility & How to Improve It
Male factors contribute to a large share of couples' infertility — around a third or more — which is why the man is always tested.
Quick Facts
Fertility is a shared journey — and male factors are involved far more often than many people realise. Worldwide, around 1 in 6 people of reproductive age experience infertility, and male-factor infertility plays a role in a large share of couples (estimates commonly put it at around a third or more of cases). That's why, in any fertility assessment, the man is always tested too.
Male fertility mainly comes down to healthy sperm — enough of them, moving well, and normally formed — plus the ability to deliver them. The key test is a semen analysis, which is the gold-standard first test and checks sperm volume, count, concentration, movement (motility) and shape. Encouragingly, sperm health can often be improved with lifestyle changes, and many causes are treatable.
This guide explains how male fertility works, what affects it, what a semen analysis involves, and the evidence-based steps to support sperm health. Difficulty conceiving is common and never something to feel ashamed about.
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Things worth knowing
Fertility is a shared journey
Male factors play a role in a large share of couples, so the man is always tested too.
Semen analysis is the key test
It checks volume, count, motility and shape — the gold-standard first test.
One result isn't the whole story
Sperm production varies, so an abnormal result is often repeated before any conclusions.
Sperm take 2–3 months to develop
Consistent healthy habits over that time can improve results — change takes patience.
Lifestyle really matters
Healthy weight, no smoking, less alcohol and less heat can all support sperm health.
Common — not shameful
Difficulty conceiving is common and many causes are treatable, so it's worth checking.
Everything You Need to Know (Sperm Health & Semen Analysis)
Male fertility depends on producing healthy sperm and delivering them. A semen analysis assesses the key measures:
| Measure | What it means |
|---|---|
| Volume | The amount of semen produced |
| Sperm count / concentration | How many sperm are present |
| Motility | How well sperm move (important for reaching the egg) |
| Morphology | The shape/structure of sperm |
| Other | pH, signs of infection, and more |
One result isn't the whole story
Sperm production varies, so an abnormal result is often repeated before conclusions are drawn. Reference ranges follow WHO criteria, which have been refined over time.
Male factor is common — not rare or shameful
It contributes to a substantial share of couples' infertility, which is exactly why both partners are assessed.
Signs
Often there are no obvious symptoms other than difficulty conceiving. Sometimes there are clues:
Possible clues
- Difficulty conceiving after regular trying
- Sexual-function issues (low libido, erectile or ejaculation difficulties)
- Testicular problems — pain, swelling, lumps, or a history of undescended testes
- Signs of hormonal issues (e.g. reduced body hair)
- A varicocele (enlarged scrotal veins) — sometimes noticeable, often not
- History of STIs, mumps, injury, surgery, or certain treatments
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Tick the symptoms that apply to you. This is a self-check, not a diagnosis — saved on this device only.
Any testicular lump, swelling or persistent pain should be checked by a doctor promptly (for fertility and general health).
Causes
Common causes/contributors to male-factor infertility:
- Sperm problems
- Low count, poor motility, or abnormal shape (the most common findings).
- Varicocele
- Enlarged veins in the scrotum that can impair sperm production by affecting drainage/temperature.
- Infections
- Including some STIs (e.g. chlamydia, gonorrhoea) that can affect sperm or block delivery.
- Hormonal issues
- Problems with testosterone or pituitary hormones.
- Blockages or structural issues
- Preventing sperm from being ejaculated.
- Lifestyle factors
- Smoking, excess alcohol, recreational drugs, high BMI, excess heat (e.g. hot tubs), and stress.
- Medical treatments
- Some medicines, chemotherapy, or radiotherapy.
- Genetic factors
- In some cases.
Male Fertility Testing
A male assessment is part of every couple's fertility workup.
What's involved
- History & examination — general health, lifestyle, past infections/surgery, sexual function; examination of the testes (e.g. for a varicocele)
- Semen analysis — the key first test (often repeated to confirm)
- Blood tests — hormones (e.g. testosterone, FSH, LH) if indicated
- Further tests — scrotal ultrasound, genetic tests, or specialist investigations if results are abnormal
- Referral to a urologist/andrologist or fertility specialist as needed
Keep semen-analysis and other reports in ParentVibes Medical Records.
Treatment
Treatment depends on the cause; many options exist:
- Lifestyle-related
- Stop smoking, reduce alcohol, healthy weight, reduce heat exposure — can improve sperm over months.
- Varicocele
- Surgical repair in selected cases.
- Infection
- Treating the infection.
- Hormonal
- Specific medical treatment.
- Blockages
- Surgery in some cases.
- Severe sperm issues / unexplained
- Assisted reproduction — especially ICSI with IVF, where a single sperm is injected into an egg.
Specialist-led treatment only
Never use unproven "fertility boosters" or self-prescribe. Discuss evidence-based options with a doctor; supplements marketed for male fertility have mixed evidence.
Improving Sperm Health (Evidence-Based)
Sperm take roughly two to three months to develop, so consistent healthy habits over that time can improve results:
Sperm-health habits (3-month focus)
- Maintain a healthy weight — higher BMI is linked with lower sperm count and motility
- Stop smoking; limit alcohol; avoid recreational drugs
- Reduce excess heat to the testes (hot tubs, very hot baths, laptops on the lap)
- Manage stress — chronic stress can affect the hormones needed for sperm
- Eat a balanced diet rich in fruit, vegetables and antioxidants
- Prevent STIs — use condoms with new partners; treat infections promptly
- Exercise regularly (moderately) and sleep well
When to See a Doctor
See a doctor (with your partner) if:
- You've been trying for 12 months without success (or 6 months if the female partner is 35+)
- You have testicular pain, swelling or lumps (check promptly)
- You have sexual-function concerns (libido, erection, ejaculation)
- You have a history of undescended testes, mumps, STIs, injury, surgery, or cancer treatment
- You'd like a fertility check or have concerns about sperm health
Seek urgent care
For sudden severe testicular pain or swelling — this can be a medical emergency.
Continue learning
Frequently Asked Questions
How common is male infertility?
Very common — male factors contribute to a large share of couples' infertility (often estimated at around a third or more), which is why men are always tested.
What does a semen analysis check?
Semen volume, sperm count/concentration, motility (movement), and morphology (shape), plus signs of infection — it's the key first test.
Can sperm health be improved?
Yes — stopping smoking, reducing alcohol, a healthy weight, avoiding excess heat, and a good diet can improve sperm over about 2–3 months.
How long does sperm take to develop?
Roughly 2–3 months, which is why healthy changes take time to show in results.
What is ICSI?
A form of IVF where a single sperm is injected directly into an egg — often used for male-factor infertility.
Does a varicocele cause infertility?
It's more common in men with fertility issues and can affect sperm; repair helps in selected cases. A specialist can advise.
Do "male fertility" supplements work?
Evidence is mixed; don't rely on them or self-prescribe — ask a doctor.
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Medical review
- Last reviewed
- June 2026
- Medical reviewer
- Dr. Vinika G.
- Next review due
- June 2027
- Status
- Medically reviewed by Dr. Vinika G.
References
This article is for general information and education only and is not a substitute for professional medical advice, diagnosis, or treatment. Male fertility is individual and best assessed alongside the partner. Consult a qualified doctor, urologist/andrologist or fertility specialist for testing and treatment, and before taking any supplement or medicine. Seek urgent care for sudden severe testicular pain or swelling. In a medical emergency, contact your doctor or local emergency services immediately. Content reviewed against guidance from WHO, NHS, CDC and peer-reviewed literature.
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Medical disclaimer
This article is for educational purposes only and does not replace medical advice. If you have severe pain, heavy bleeding, missed periods, or unusual symptoms, please consult a qualified healthcare provider.