Will I Lose Length After Prostate Surgery? What the Research Shows

Yes, many men do experience some loss of penile length and girth after radical prostatectomy. It is one of the most common physical changes after surgery, and it is also one of the least discussed. The encouraging part is that it is not entirely inevitable, and what you do in the months surrounding your surgery appears to make a real difference.

I’m going to talk about this plainly, because I’ve found that men would rather hear the truth than be managed.

Why nobody warns you about this

Before my own prostate cancer treatment, I had conversations about cancer control, incontinence, and erectile dysfunction. Nobody mentioned size.

Then it happened, and I found out later that it happens to a great many men — and that most of them were as surprised as I was. I’ve since spoken with thousands of men, and this is the change that hits hardest emotionally, even among men who were prepared for erectile dysfunction. It isn’t vanity. It’s a change to your body that nobody told you to expect, discovered at a moment when you’re already dealing with cancer.

If this has happened to you, you are not unusual and you are not alone.

Why it happens

Three things are going on at once.

Loss of the nightly erection cycle. A healthy man has several erections during sleep. That cycle isn’t about sex — it’s how penile tissue gets stretched and oxygenated on a regular basis. Prostate surgery disrupts the nerves that produce those erections, so the cycle stops.

Tissue changes from lack of oxygen. Tissue that goes without regular oxygenated blood flow begins to change. Researchers describe this as a process where erectile tissue can become more fibrous over time — essentially, more scar-like and less elastic. Elastic tissue is where length comes from.

Structural changes from the surgery itself. Removing the prostate shortens the urethra, and the way the remaining structures are reconnected can contribute to a change in length independent of tissue health.

The first two are the ones that rehabilitation addresses. The third is surgical.

How much, and for how long?

Studies report a range, and honest answers here are ranges rather than a single number.

What’s more interesting than the average is the difference between groups. In one study following men after prostatectomy, 23% of men who used a vacuum device successfully reported a decrease in penile length and circumference at nine months. Among men in the same study who did not respond to the device, 85% reported a decrease. In the control group that did not use a device at all, a majority reported a decrease.

Those aren’t perfect numbers from a perfect study, and I won’t pretend they are. But the pattern across the research is consistent enough to be worth acting on: men who maintained blood flow to the tissue fared better on this measure than men who did not.

Timing also matters. Loss appears to be greatest in the first several months after surgery — which is exactly the window when most men are focused on cancer recovery and not thinking about tissue health.

What “stretch” actually means

Here’s a way to think about it that I use with the men I work with.

Penile tissue behaves like elastic. Elastic that is regularly stretched stays pliable. Elastic that sits unused in a drawer for a year gets stiff and loses its give. That’s not a perfect analogy biologically, but it captures the mechanism well enough to act on.

Every erection does three things at once: it brings oxygen-rich blood to the cells, it stretches the tissue, and it exercises the smooth muscle inside the penis. When the nightly cycle stops after surgery, all three stop.

A vacuum device is a way of producing that stretch and that blood flow mechanically, on a schedule, during the period when the body can’t produce it on its own. That’s the entire logic of penile rehabilitation.

Why starting before surgery matters most

If you’re reading this before your operation, this is the most useful thing in the article.

Men who begin rehabilitation before surgery — a practice called prehabilitation — go into the operation with well-conditioned, well-oxygenated tissue. They also learn to use the device while they’re feeling well, instead of trying to learn something new during catheter recovery.

The research on prehabilitation is younger than the research on post-surgical rehabilitation, and I’d be overstating it to call the evidence settled. But the reasoning is straightforward and the downside is essentially zero. Every urologist I work with who has seen it in practice thinks it helps.

If you have a surgery date, this is a conversation worth having with your urologist now rather than at your follow-up.

What if my surgery was months or years ago?

Start anyway.

I’ll be honest with you: the earlier you start, the better the outcome tends to be. That’s true across all of this research. But “earlier is better” is not the same as “later is useless,” and men who begin months or years after treatment still report improvement in function and, for some, in size.

The tissue is more resilient than the timelines in most pamphlets suggest. What you cannot do is get back the months you spent waiting — so the answer to “is it too late?” is always the same. Start today.

What realistic expectations look like

I want to be careful here, because this is a topic where men are vulnerable to being sold miracles.

Penile rehabilitation is not a lengthening procedure. Nobody should promise you that a device will make you larger than you were before treatment. What rehabilitation aims to do is preserve what you have and recover what recent inactivity has cost you.

Progress is slow and it is not linear. Some weeks will look better than others. The men who do well are almost always the ones who stopped measuring week to week and kept going for months.

Talking about it

One more thing, because it comes up in nearly every conversation I have.

Men often carry this privately, including from their partners. And partners frequently sense that something is wrong and interpret the withdrawal as disinterest, which makes everything worse.

Saying it out loud — this changed, it bothers me, I’m working on it — is usually less painful than the alternative. In my experience partners respond to that far better than men expect.

Where to start

If you have a surgery date coming up, or if you’re in recovery and this is the change that’s been on your mind, the first step is understanding what a rehabilitation program actually involves.

Every CBH program includes an FDA-cleared device, a routine built for your specific situation, video tutorials, and one-on-one coaching support so you have someone to ask when you’re unsure.

Call or text me at 947.224.7342. I’ve had this conversation thousands of times, and I’ve had it about myself. There’s nothing you can ask me that will surprise me.

Frequently Asked Questions

Is length loss after prostate surgery permanent? Not necessarily. Some men recover length as erectile function returns, particularly those who maintain regular blood flow to the tissue during recovery. Outcomes vary based on how quickly rehabilitation begins.

Does radiation cause length loss too? Radiation can affect erectile tissue gradually rather than immediately, and men on hormone therapy may experience changes as well since hormone therapy suppresses the body’s natural erection cycle.

When should I start rehabilitation to protect length? Before surgery if possible. Otherwise, as soon as your physician clears you — typically a few weeks after the catheter is removed.

Will a vacuum device make me longer than I was before? No. The goal of penile rehabilitation is to preserve and restore, not to enlarge. Be cautious of anyone promising otherwise.

Do nerve-sparing procedures prevent this? Nerve-sparing surgery improves the odds of erectile recovery but does not eliminate the risk of size change. Even nerve-sparing procedures affect the neurovascular bundles.