Low Sperm Count: Causes, Signs, and What to Do About It

What Is Low Sperm Count?

Low sperm count — medically known as oligospermia — means that the fluid you ejaculate during orgasm contains fewer sperm than normal. A normal sperm count is 15 million sperm per milliliter or more. Anything below that threshold is considered low.

Having a low sperm count doesn't mean conception is impossible. But it does reduce the likelihood of fertilizing an egg naturally — and the lower the count, the greater the impact on fertility.

Signs You Might Have Low Sperm Count

This is where most men get caught off guard: low sperm count typically has no obvious symptoms. You cannot feel it, and it does not affect sexual function, libido, or ejaculation in most cases.

The only reliable way to know your sperm count is through a semen analysis.

That said, some underlying causes of low sperm count do produce noticeable signs. These include:

• Low sex drive or erectile dysfunction — which can indicate low testosterone, a common driver of low sperm count
• Pain, swelling, or a lump in the testicle area — which may indicate a varicocele or other structural issue
• Decreased facial or body hair — which can signal a hormonal imbalance affecting sperm production
• A history of difficulty conceiving with a partner

If any of these are present, a fertility evaluation is worth scheduling sooner rather than later.

What Causes Low Sperm Count?

Low sperm count can have medical, environmental, and lifestyle causes — and in many cases, more than one factor is involved.

Medical Causes

Varicocele - A varicocele is an enlargement of the veins within the scrotum — similar to varicose veins. It is one of the most common and most correctable causes of low sperm count. Varicoceles raise the temperature inside the scrotum, which impairs sperm production.

Hormonal Imbalances - Sperm production is controlled by a hormonal cascade involving the brain, pituitary gland, and testes. Disruptions anywhere in that chain — including low testosterone, elevated estrogen, or pituitary dysfunction — can significantly reduce sperm count.

Infections - Certain infections can temporarily or permanently affect sperm production, including sexually transmitted infections, prostatitis, and epididymitis. Some infections cause scarring that blocks sperm transport even after the infection resolves.

Ejaculation Problems - Retrograde ejaculation — where semen travels into the bladder instead of out through the urethra — can result in very low or absent sperm in the ejaculate. This is common in men with diabetes, spinal cord injuries, or certain surgical histories.

Genetic Conditions - Conditions like Klinefelter syndrome, Y chromosome microdeletions, and other genetic disorders can impair sperm production at a fundamental level. Genetic testing is an important part of a thorough fertility evaluation when other causes cannot be identified.

Prior Surgeries or Injuries - Surgeries involving the groin, bladder, or testicles — as well as physical trauma to the area — can affect sperm production or transport.

Lifestyle and Environmental Causes

Heat Exposure - Elevated scrotal temperature is one of the most common and correctable causes of reduced sperm production. Regular hot tub use, saunas, prolonged laptop use on the lap, and tight underwear can all raise scrotal temperature enough to affect sperm count over time.

Alcohol and Drug Use - Alcohol, anabolic steroids, marijuana, and certain recreational drugs can all reduce sperm count and quality. Anabolic steroids in particular can cause significant and sometimes prolonged suppression of sperm production.

Obesity - Excess body weight is associated with hormonal changes — particularly increased estrogen and decreased testosterone — that can directly impair sperm production.

Stress - Chronic psychological stress affects hormone levels throughout the body, including those that regulate sperm production. Prolonged stress is an underrecognized contributor to male fertility issues.

Medications - Certain medications — including some antibiotics, antidepressants, and testosterone replacement therapy — can temporarily or significantly reduce sperm count. If you're on any long-term medications and concerned about fertility, discuss this with your provider.

Can Low Sperm Count Be Treated?

In many cases, yes. The right treatment depends entirely on the underlying cause — which is why identifying the cause matters before choosing a path forward.

Varicocele repair can significantly improve sperm count in men where varicocele is identified as the primary cause.

Hormonal treatment can restore sperm production in men with hormonal imbalances — particularly when natural testosterone stimulation is used rather than synthetic replacement.

Lifestyle modifications — reducing alcohol, eliminating heat exposure, managing weight and stress — can produce meaningful improvements in sperm count over time, particularly when combined with medical treatment.

Assisted reproduction — including IVF with ICSI — can help couples conceive even when sperm count remains low after treatment.

The most important first step is a comprehensive evaluation to understand exactly what is driving the low count.

Why Getting Evaluated Early Matters

Low sperm count does not resolve on its own. And because it rarely produces symptoms, many men don't find out until a couple has been trying to conceive for months or years without success.

The earlier a low sperm count is identified and the cause determined, the more treatment options are available — and the better the outcomes tend to be.

Serving Houston and the Surrounding Areas

The Y Factor provides comprehensive male fertility evaluations and low sperm count treatment to men across the greater Houston area, including Katy, The Woodlands, Tomball, Sugar Land, Cypress, Spring, Pearland, Friendswood, and League City.

Schedule Your Evaluation at The Y Factor

If you've been trying to conceive without success, or simply want to understand your fertility baseline, a semen analysis at The Y Factor is the right first step. Our team will identify the cause of any abnormalities and build a personalized treatment plan around your specific situation.

Women have OB-GYNs. Men have The Y Factor.

Call us today or book online. Same-week appointments available in Houston.