Do Steroids Shrink Your Penis or Testicles?

Anabolic steroids do shrink the testicles, often enough that men notice, but they don’t shrink the penis of an adult man.¹² The shrinking comes from the body switching off its own testosterone production, and a fully grown penis doesn’t depend on that. The bigger question for most men is what happens to sperm and natural testosterone after stopping.³

How Much Steroids Shrink the Testicles

The difference is measurable and large. Men currently using steroids had average testicles of about 12 ml, compared with roughly 22 ml in men who never used.⁴ Men who had stopped still averaged about 17 ml, almost 5 ml smaller than non-users.⁵

Shrinkage shows up quickly, with size dropping mostly within the first 32 weeks or so of use.⁶ The testicles may feel softer and smaller, sometimes within weeks of starting a cycle, and the scrotum may hang differently or look tighter. It’s usually painless, so men tend to notice by appearance rather than discomfort.

Total time on steroids matters. The longer someone used in total, the smaller their testicles tended to be.⁷

Size alone doesn’t tell you how well the testicles are working. A testicle’s volume mostly reflects its sperm-making tissue, so a smaller one usually means less sperm production, but it’s only a rough guide. A man can have near-normal size and still have low sperm output, and some men with smaller testicles still make some sperm. Blood hormone tests and a semen analysis measure function. For size, clinicians compare against a set of graded beads or use ultrasound, which is more reliable than comparing by eye.

Why the Testicles Shrink

Normally the brain sends hormone signals that tell the testicles to make testosterone and sperm. When steroids flood the body, the brain senses plenty of testosterone and stops sending those signals.⁸ The testicles’ own testosterone production falls as a result.⁹ Sperm production slows down at the same time.¹⁰ The sperm-making tubes make up more than 90% of the testicle’s volume, so when they waste away the whole testicle shrinks.¹¹ In animal studies, steroid cycles destroyed the cells that make testosterone and caused clear shrinkage.¹²

The brain’s pituitary gland releases two messenger hormones, LH and FSH, and these are the actual signals the testicles respond to. LH mainly tells the testicles to make testosterone, while FSH mainly supports sperm production. Outside steroids make the brain read blood hormone levels as high, so it cuts back both, and the testicle tissue that responds to these signals idles and shrinks.

Sperm production also depends on very high testosterone inside the testicles, far higher than the level in the blood. Injected steroids raise blood levels but don’t recreate that concentrated level inside the testicle, because its own production has dropped. Some steroids are also converted to estrogen, which adds to the brain’s shutdown of the signals.

Why the Penis Doesn’t Shrink

Penis growth depends on testosterone during childhood and puberty, then stops. In lab tissue, extra-high testosterone made penile tissue no larger than normal levels did, and very high doses didn’t change the tissue’s structure at all.¹³ Giving testosterone to boys before puberty didn’t lead to a shorter penis as adults.¹⁴ Neither growth nor shrinkage is expected from steroid use in grown men. The testicles are different: they are working organs that need constant hormonal signaling to maintain their tissue, which is why they respond to the shutdown and the penis doesn’t.

Some men still feel it got smaller, and there are reasons. Steroids can disrupt sexual function, including erections, especially after stopping.¹⁵ Erections depend on healthy testosterone along with blood flow and nerve signaling, so a hormone crash after a cycle can weaken them. A less firm erection looks and measures shorter than a full one, even though the tissue itself is unchanged. Much larger muscles and body fat changes can also make the penis look smaller in proportion.

Measuring stretched length gives a steadier comparison than judging by eye, since flaccid size naturally varies with cold, stress and arousal. A penis that seems smaller alongside erection trouble more likely reflects weaker erections than true shrinkage, and when erections return to normal as hormones recover, the apparent difference usually goes away too.

Do Testicles Return to Normal After Stopping

Most lost testicle size comes back after stopping, but it can take years and often isn’t complete.¹⁶ In most men, testosterone returned to normal within about 3 months of stopping.¹⁷ Sperm production took longer, about a year.¹⁸ In the first weeks to months, expect possible fatigue, low mood and low sex drive as hormones restart. Even so, about 1 in 10 men still had low testosterone at the end of follow-up, and about a third still had sperm counts below the normal range.¹⁹ In rare cases, steroid damage to the testicles has become permanent.²⁰

Low testosterone can linger in former users for years.²¹ In one large urology clinic, about 1 in 60 men seen for low testosterone had it from steroid use.²² Lingering symptoms after quitting are worth checking rather than waiting out indefinitely.

The order makes sense. Testosterone returns first because the testicle’s hormone-making cells can restart once the brain signals them again. Sperm take longer because new sperm need a couple of months to mature after the tubes restart. Volume lags furthest because the tubes have to rebuild their lining and tissue. So a man can have normal blood testosterone and still have smaller testicles and low sperm counts.

Recovery may have stalled if sex drive or erections are still poor many months after stopping, if tiredness, low mood or muscle loss persist, or if the testicles haven’t regained size over a year or more. Any of these is a reason to get a blood hormone test.

Treatments That Help Recovery

Treatment for steroid-related low testosterone includes careful testosterone replacement, hCG, and drugs that block estrogen’s signal to the brain.²³ hCG (human chorionic gonadotropin) is an injected hormone that imitates the brain’s signal to the testicles. In men whose testicles never got that signal naturally, hCG raised testosterone and modestly increased testicle size within months.²⁴ In men with prior steroid use, hCG-type treatment restores sperm production about as well as in men with natural hormone deficiency.²⁵ Evidence for clomiphene pills alone in former steroid users is very limited.²⁶

The options work differently. hCG acts like the brain’s LH signal, so it stimulates the testicles directly and can restore their own testosterone and sperm. Clomiphene-type drugs are pills that block estrogen’s effect on the brain, so the brain sends out more of its own signals, which only works if the brain and testicles can still respond. Testosterone replacement supplies the hormone itself, which relieves symptoms but doesn’t restart the testicles.

Prescribed testosterone switches off sperm production just as steroids do, so it treats symptoms while keeping the testicles idle. Men wanting children usually need hCG-type treatment instead.

At the appointment, being honest about steroid use lets the doctor choose the right tests. Expect blood tests for testosterone and the brain’s signaling hormones, plus a semen analysis if fertility matters. Treatment is usually a few months of injections or pills with follow-up tests.

What Steroids Mean for Fertility

During steroid use, about 3 in 4 men had sperm counts below the normal range.²⁷ Steroid-related infertility involves low or absent sperm and sperm that swim or are shaped poorly.²⁸ Even when the count looks normal, sperm movement tends to be lower in users.²⁹ A semen analysis looks at count, movement and shape together, so it gives a fuller picture than count alone.

Sperm can drop all the way to zero. With enough suppression, production can stop entirely, leaving no sperm in the semen. This is usually a temporary effect of the shutdown, which is why recovery is possible, though not guaranteed.

Among former users seeking fertility care, about half had no sperm at all at first.³⁰ After about 6 months of hCG and clomiphene, roughly 1 in 6 reached normal counts and about 3 in 10 improved partway.³¹ About half still had no or very few sperm.³² Of couples who reported back, nearly 4 in 10 achieved a pregnancy, most of them naturally.³³

Men planning a family should stop steroids early and get a semen test rather than assume fertility returns. Allow at least a year after stopping before expecting sperm recovery. Fertility clinics can help with assisted conception if counts stay low.

Steroids are not birth control, either. Low sperm counts don’t reliably prevent pregnancy, and some users still have enough sperm to conceive. Partners should use contraception if not planning a child.

Other Body Changes Men Notice

Nearly 4 in 10 male users said boosting sex drive was a reason they started.³⁴ Many later reported lower sex drive, poorer sexual function and fertility problems after stopping, which pushed some to restart.³⁵

The swing goes both ways because higher testosterone during a cycle often increases desire, which is why men connect steroids with better sex. After stopping, the body’s own testosterone is low for a time, so desire can fall below normal. The drop often seems worse because it follows an artificially high period. Erections and mood often follow the same pattern, so the problems tend to come together.

Low sex drive after a cycle can tempt men to start again, which resets testicle recovery. Getting hormones checked offers a way out.

Steroids can also cause breast tissue growth in men, driven by hormone signals in that tissue.³⁶ A firm lump under the nipple is the typical sign. Early growth may ease after stopping, but long-standing tissue often doesn’t. A doctor can examine it and advise on treatment.

In women, steroids can enlarge the clitoris, which many found distressing.³⁷ A supportive partner response helped women cope with that change.³⁸

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