Sperm Motility Issues: Causes, Testing, and Treatment Options

When your semen analysis comes back showing motility issues, it can feel like a gut punch. You might not have even known sperm motility was a thing until suddenly it became your thing. And now you are left wondering what it means, whether it is your fault, and what can actually be done about it.

First, take a breath. Sperm motility issues are one of the more common findings on semen analysis, and they are also one of the more treatable. Many men with motility issues go on to father children, whether naturally, with simple interventions, or with assisted reproduction. For a broader understanding of male fertility challenges, see our complete guide to male infertility.

This guide will explain what sperm motility actually is, why it matters for fertility, what might be causing your issues, and most importantly, what you can do to improve your chances of conception.

Understanding Sperm Motility

Motility refers to the sperm's ability to move. But not just any movement counts; for fertility purposes, we care about whether sperm can swim effectively toward an egg.

Types of Motility

When a laboratory analyses sperm motility, they categorise sperm into different groups.

Progressive Motility

This is the most important category for fertility. Progressively motile sperm swim forward in a relatively straight line or in large circles. These are the sperm capable of traveling through the female reproductive tract to reach and fertilise an egg.

Non-Progressive Motility

These sperm move but do not make forward progress. They might swim in small circles or vibrate in place. While technically motile, they are unlikely to reach an egg.

Immotile

These sperm do not move at all. A certain percentage of immotile sperm is normal in any sample.

What the Numbers Mean

Under the current World Health Organisation laboratory manual (6th edition, 2021), the lower reference limits are 42 percent total motility (any movement) and 30 percent progressive motility. These represent the 5th percentile of men whose partners conceived within a year. You may still see the older 2010 figures of 40 and 32 percent on some reports. The WHO stresses that these limits alone cannot diagnose infertility.

If your results fall below these limits, this is often described as asthenozoospermia, or reduced sperm motility. The severity matters; mildly reduced motility has a different prognosis than severely reduced motility. Motility issues often occur alongside low sperm count, and both factors are evaluated together when assessing fertility.

Why Motility Matters for Fertility

For natural conception, sperm face an incredible journey. They must travel from the vagina through the cervix, into the uterus, and up the fallopian tube to meet the egg. For a cell far too small to see with the naked eye, it is an epic trek.

Only sperm that can swim strongly and persistently have any chance of completing this journey. Poor motility means fewer sperm reach the egg, reducing the chances of fertilisation.

Even with assisted reproduction, motility matters. For IUI, sperm still need to swim from the uterus to the egg. For conventional IVF, sperm must be able to penetrate the egg. Only with ICSI, where a single sperm is injected directly into the egg, does motility become less critical.

What Causes Sperm Motility Issues

Many factors can affect how well sperm swim. Identifying the cause, when possible, helps guide treatment. For a broader overview of male fertility challenges, see our guide to fertility conditions.

Varicocele

A varicocele is an enlargement of the veins within the scrotum, similar to varicose veins in the legs. Varicoceles are present in about 15 percent of all men and around 40 percent of men with fertility issues.

Varicoceles can affect sperm production and quality by raising testicular temperature and affecting blood flow. For a varicocele that can be felt on examination in a man with abnormal semen results, repair is associated with improved sperm parameters, including motility, and higher natural pregnancy rates in studies.

Infections

Current or past infections of the reproductive tract can damage sperm and affect motility. Sexually transmitted infections like chlamydia and gonorrhea can cause inflammation and scarring. Prostatitis and other genitourinary infections can also affect sperm quality.

Treating active infections can help, though damage from past infections may be permanent.

Lifestyle Factors

Several modifiable factors affect sperm motility.

Heat Exposure

Sperm production requires temperatures slightly below body temperature, which is why the testicles are located outside the body. Frequent hot tub or sauna use, wearing tight underwear, prolonged laptop use on the lap, and occupations involving prolonged sitting or heat exposure can all impair sperm motility.

Smoking

Smoking damages sperm DNA and reduces motility. Because new sperm take a couple of months to develop, any benefit from quitting takes at least that long to show.

Alcohol

Heavy alcohol consumption negatively affects sperm production and motility.

Obesity

Excess weight is associated with hormonal changes and increased scrotal temperature, both of which can reduce sperm motility.

Recreational Drugs

Marijuana, anabolic steroids, and other recreational drugs can significantly impair sperm production and function.

Hormonal Imbalances

Testosterone and other hormones regulate sperm production. Imbalances can affect sperm development, resulting in poor motility. Low testosterone, high prolactin, or thyroid disorders can all play a role.

Genetic Factors

Some men have genetic conditions that affect sperm structure and function. Defects in the sperm tail (flagellum), which powers movement, can cause severe motility issues. Primary ciliary dyskinesia is one such condition.

Oxidative Stress

Excessive reactive oxygen species (free radicals) in semen can damage sperm membranes and impair motility. Antioxidant supplements are often suggested, but the evidence that they improve fertility is weak (see below).

Antisperm Antibodies

In some men, the immune system produces antibodies that attach to sperm and impair their movement. This can occur after vasectomy reversal, testicular trauma, or infection.

Idiopathic (Unknown Cause)

In many cases, no specific cause for reduced motility is identified despite thorough evaluation.

Testing and Diagnosis

Semen Analysis

The starting point is a semen analysis. Because sperm parameters can vary significantly between samples, an abnormal result should be confirmed with at least one repeat analysis before drawing conclusions. American guidance suggests tests about a month apart; NICE suggests repeating ideally about 3 months later.

Additional Testing

If motility issues are confirmed, additional testing may include hormone blood tests (testosterone, FSH, LH, prolactin, thyroid), physical examination to check for varicocele, ultrasound of the scrotum if varicocele is suspected, testing for infection if symptoms suggest this, and genetic testing in severe cases.

Treatment and Improvement Strategies

Lifestyle Modifications

Healthy lifestyle changes are worthwhile for many men, and any effect on sperm takes 2 to 3 months to show (roughly the time it takes for new sperm to develop and reach the ejaculate).

Quit Smoking

This is one of the most impactful changes you can make.

Reduce Alcohol

Limit consumption to moderate levels or eliminate it entirely while trying to conceive.

Maintain Healthy Weight

If overweight, losing weight can improve hormonal balance and sperm quality.

Avoid Heat

Skip hot tubs and saunas. Wear loose-fitting underwear. Take breaks if you sit for long periods. Do not place laptops directly on your lap.

Exercise Moderately

Regular moderate exercise supports overall health and may improve sperm quality. Avoid excessive intense exercise, which can have the opposite effect.

Eat Well

A diet rich in fruits, vegetables, whole grains, lean proteins, and healthy fats supports sperm health. Foods high in antioxidants may be particularly beneficial.

Supplements

Many supplements are marketed for sperm motility. Some small studies suggest benefits, but the evidence is weak: the American Urological Association and ASRM advise that supplements and antioxidants are of questionable value for male infertility, and European urology guidelines note that the benefits seen in small studies have not been supported by randomised trials. The supplements most often discussed are listed below.

Coenzyme Q10 (CoQ10)

An antioxidant that may improve sperm motility and protect against oxidative damage.

L-Carnitine

An amino acid involved in energy production that may support sperm motility.

Zinc

Important for sperm development and function.

Selenium

An antioxidant that may improve sperm motility.

Omega-3 Fatty Acids

May support sperm membrane health and motility.

Vitamin E and Vitamin C

Antioxidants that may protect sperm from oxidative damage.

Because the evidence is weak, supplements should not delay proper evaluation or effective treatment. Discuss any supplement with your doctor before starting.

Medical Treatment

Varicocele Repair

If a varicocele can be felt on examination and your semen results are abnormal, repair may improve sperm parameters. Improvement typically takes several months to show.

Hormone Therapy

If hormonal imbalances are identified, treatment to correct them may improve sperm production and quality.

Antibiotic Treatment

If an infection is confirmed, appropriate antibiotics can resolve it, potentially improving sperm quality. NICE advises against antibiotics just because white blood cells are seen in the semen without an identified infection.

Assisted Reproduction

When motility issues persist despite treatment, assisted reproduction offers effective solutions.

IUI (Intrauterine Insemination)

Sperm are washed and concentrated, then placed directly into the uterus, reducing the distance they need to travel. IUI can help with mild to moderate motility issues.

IVF (In Vitro Fertilisation)

Eggs are retrieved and combined with sperm in a laboratory dish. This reduces the distance sperm need to travel to essentially zero.

ICSI (Intracytoplasmic Sperm Injection)

A single sperm is injected directly into an egg. ICSI is highly effective even with severe motility issues, as long as viable sperm can be obtained. The sperm does not need to swim at all.

Timeline for Improvement

Sperm take roughly two to two and a half months to develop and reach the ejaculate (one tracer study measured about 64 days on average), so any intervention (lifestyle change or treatment) takes about 2 to 3 months to affect sperm quality. Be patient and consistent with changes.

A repeat semen analysis after this period can assess whether improvement has occurred.

Questions to Ask Your Doctor

If you have been diagnosed with sperm motility issues, consider asking what might be causing your motility issues, whether additional testing is recommended, what lifestyle changes might help, whether supplements are appropriate for you, whether any medical treatment might improve your motility, and what fertility treatment options would work for your level of motility.

The Emotional Side

Receiving a diagnosis that affects your fertility can be challenging. Men often feel that their masculinity or identity is tied to their ability to father children, and learning about sperm issues can shake that sense of self.

These feelings are normal. Many men in your situation have felt the same way. Talking to your partner, a counselor, or other men who have faced fertility challenges can help. Remember that sperm motility issues are a medical condition, not a reflection of who you are.

Sources

• WHO laboratory manual for the examination and processing of human semen, 6th edition (2021) (checked October 2026)
• Boitrelle et al. The sixth edition of the WHO manual for human semen analysis: a critical review. Life, 2021 (checked October 2026)
• AUA/ASRM: Diagnosis and Treatment of Infertility in Men (guideline, amended 2024) (checked October 2026)
• EAU Guidelines on Sexual and Reproductive Health: Male infertility (checked October 2026)
• NICE NG257: Testing and management of male factor fertility problems (2026) (checked October 2026)
• Misell et al. Measuring human spermatogenesis kinetics in vivo. J Urol, 2006 (checked October 2026)
• HFEA: Intracytoplasmic sperm injection (ICSI) (checked October 2026)

Medical Disclaimer

This article provides general information about sperm motility issues. Individual situations vary, and treatment should be personalised based on your specific diagnosis and circumstances. Please consult with a qualified healthcare provider or fertility specialist for guidance.