Low Sperm Count: Causes, Treatment & Pregnancy Chances

Written by: Parivar Saathi Editorial Team

Editorial review: Dr. Deeksha Goswami, Senior Fertility Counsellor

Published: 19 June 2026

Quick Answer

A low sperm count, known medically as oligospermia, means having fewer than 15 million sperm per millilitre of semen. It is one of the most common causes of male infertility, but it rarely means a man cannot father a child. Many cases are caused by treatable factors such as infection, varicocele, hormonal imbalance or lifestyle, and conception is often still possible naturally or with treatments such as IUI, IVF or ICSI.

Key Facts at a Glance

1. Normal sperm count: 15 million or more sperm per millilitre of semen (WHO reference).
2. Low count (oligospermia): below 15 million per millilitre; a severe count is below 5 million.
3. Male factors contribute to roughly 40 to 50 percent of all infertility cases.
4. A semen analysis is the single test that confirms a low count.
5. Most causes are treatable or manageable, and pregnancy is often still possible.

What Is a Low Sperm Count?

A low sperm count means your semen contains fewer sperm than normal. The World Health Organization considers a normal count to be at least 15 million sperm per millilitre, or about 39 million in a single ejaculate. Below this level the chance of fertilising an egg falls, though it does not drop to zero. Sperm count is only one part of male fertility; how well sperm move (motility) and their shape (morphology) matter just as much, which is why a full semen analysis looks at all three.

Signs and Symptoms

Most men with a low sperm count have no obvious symptoms, and the problem is often found only when a couple struggles to conceive. Sometimes there are signs of an underlying cause, such as a swelling or lump in the testicle, a low sex drive, difficulty with erections, or reduced facial and body hair, which can point to a hormonal issue. If you notice any of these, it is worth getting checked early.

What Causes a Low Sperm Count?

1. Varicocele: enlarged veins in the scrotum that raise temperature and lower sperm quality. This is the most common reversible cause.
2. Infections: some infections, including certain sexually transmitted infections, can interfere with sperm production.
3. Heat exposure: hot tubs, saunas, laptops on the lap, tight clothing and long hours of sitting can all warm the testicles.
4. Hormonal imbalances: low testosterone or problems with the thyroid or pituitary gland can reduce sperm production.
5. Smoking and alcohol: tobacco, heavy drinking and recreational drugs all lower sperm count and quality.
6. Stress, weight and other factors: ongoing stress, obesity, some medicines and environmental toxins can also play a role.

How Is It Diagnosed?

The main test is a semen analysis, which measures sperm count, movement and shape from a single sample. Because results naturally vary, doctors usually repeat it after two to three months. Depending on the findings, your doctor may add hormone blood tests, a scrotal ultrasound to look for a varicocele, or genetic tests. Our semen analysis test guide explains what each number on your report means, and testing early can save you months of treatment by giving you answers sooner.

Treatment Options

1. Treat the underlying cause: surgery can correct a varicocele, antibiotics clear infections, and hormone therapy can address an imbalance.
2. Lifestyle changes: stopping smoking, cutting back on alcohol, reaching a healthy weight, avoiding heat and managing stress all help. Because sperm take about three months to develop, improvements take time to show.
3. Assisted reproduction: when natural conception is unlikely, IUI can help in milder cases, while IVF or ICSI is highly effective even with very low counts.

If you are weighing up treatment, our guide on when you should consider IVF explains how doctors decide, and talking to a fertility counsellor can help you choose the right path with less stress. You can also read about a man's role in fertility to see how both partners contribute.

Can You Still Get Pregnant With a Low Sperm Count?

1. Mild low count: natural conception is often still possible, sometimes with simple lifestyle changes and good timing.
2. Moderate low count: intrauterine insemination (IUI), where prepared sperm is placed directly in the uterus, may be recommended.
3. Severe low count: IVF or ICSI, where a single healthy sperm is injected directly into an egg, is very effective even when very few sperm are available.

A low sperm count does not automatically mean infertility. Every couple is different, and a proper evaluation is the best way to know which path gives you the highest chance of success.

When to See a Specialist

See a fertility specialist if you have been trying to conceive for 12 months without success, or after 6 months if your partner is over 35. Get checked sooner if you have a known risk factor such as a past testicular problem, surgery or infection. Early testing means quicker answers and more options. If you are unsure where to start, our fertility counselling guide can help you take the first step.

Frequently Asked Questions

What is considered a low sperm count?

A count below 15 million sperm per millilitre of semen is considered low, and below 5 million is severe. A semen analysis measures this, and because results vary, it is usually repeated to confirm.

Can I get my partner pregnant with a low sperm count?

Yes, often. Many men with a low count conceive naturally, especially when the count is only mildly reduced. When natural conception is unlikely, IUI, IVF or ICSI can help, even with very low counts.

How can I increase my sperm count naturally?

Stop smoking, limit alcohol, reach a healthy weight, eat an antioxidant-rich diet, sleep well, manage stress and avoid heat to the testicles. Because sperm take about three months to develop, give changes at least that long to show.

Does a low sperm count mean I am infertile?

No. A low count lowers the chance of conception but rarely makes it impossible. Many men with a low count father children, with or without treatment.

Which test confirms a low sperm count?

A semen analysis. It measures the number, movement and shape of sperm in a sample, and is usually repeated after a few months to confirm the result.

How long does it take to improve a low sperm count?

Around two to three months, because sperm take roughly 72 days to develop. Changes you make today show their effect a few months later.

Key Takeaways

1. A low sperm count (oligospermia) means fewer than 15 million sperm per millilitre, and it is one of the most common causes of male infertility.
2. Most causes, including varicocele, infection, hormonal issues and lifestyle, are treatable or manageable.
3. A semen analysis is the key test; it is simple and is usually repeated to confirm.
4. Conception is often still possible, naturally or with IUI, IVF or ICSI.
5. A low count does not mean infertility; a proper evaluation shows the best path forward.

Related Reading

1. Semen Analysis Test: What It Checks, Normal Values and How to Read Your Report — https://parivarsaathi.com/blog/semen-analysis-test-what-it-checks-normal-values-and-how-to-read-your-report
2. Men's Role in Fertility: Why OPD Checks Matter for Both Partners — https://parivarsaathi.com/blog/mens-role-in-fertility-why-opd-checks-matter-for-both-partners
3. When Should You Consider IVF — https://parivarsaathi.com/blog/when-should-you-consider-ivf
4. Fertility Counselling in Kolkata: A Complete Guide for Couples — https://parivarsaathi.com/blog/fertility-counselling-in-kolkata-a-complete-guide-for-couples-in-west-bengal

Medical References

1. World Health Organization. WHO laboratory manual for the examination and processing of human semen, 6th edition.
2. Mayo Clinic. Low sperm count: symptoms and causes.
3. NHS. Low sperm count.
4. American Society for Reproductive Medicine (ASRM). Patient resources on male infertility.

About the Author

This article was written by the Parivar Saathi Editorial Team and medically reviewed by Dr. Deeksha Goswami, Senior Fertility Counsellor.

Disclaimer

This article is for general information and education only and is not a substitute for professional medical advice. Please consult a qualified doctor or fertility specialist for diagnosis and treatment.