What causes penis shrinkage?

Concerns about penis size are common, and those worries may intensify when it seems like the penis may be getting smaller over time. For those wondering, "Why is my penis shrinking?" — first, know that any change in penis size is likely to be very minimal.

Penile shrinkage may occur for a variety of reasons, ranging from something as simple and reversible as cold temperatures to more complex health conditions. Read on to learn more about what can cause penis shrinkage and how to address it.

There are a number of causes of penis shrinkage. Most changes are temporary and/or very minimal.

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Temperature

Being in a cold environment is one of the most common causes of temporary penis shrinkage. When the body is cold, the cremaster muscle pulls the testicles closer to the body to help maintain warmth and protect sperm. 

Being in a cold environment is one of the most common causes of apparent penis shrinkage. When the body is cold, the cremaster muscles pull the testicles closer to the body to maintain warmth and protect sperm. A similar reflex may also cause the penis to temporarily retract, which can make it appear as though it has shrunk.

This is a normal physiological response. Once the body warms up, the penis will return to its normal size.

Abdominal weight gain

As people get older, body fat distribution tends to shift more toward the abdomen and pubic area. This type of weight gain may cause the penis to appear smaller, though it has not actually shrunk. 

The penis may look smaller because fatty tissue that builds up over the pubic bone can cover the base and shaft of the penis, reducing its visible length. For those for whom weight is a contributing factor, losing weight may help restore the appearance of penile size.

Peyronie’s disease

Peyronie's disease is a condition in which scar tissue develops within the penis, causing it to curve. While having a slight curve to the penis is common and not a cause for concern, this condition can cause painful erections. It may make intercourse difficult or impossible, depending on the severity. 

Peyronie's disease may decrease both the length and girth of the penis. In some cases, the condition may improve on its own, especially if the only symptom is pain. However, penile curvature tends to stay the same or worsen without treatment — either with medications, injections, surgery, or a combination of therapies, depending on the severity and stage of the disease.

Prostate surgery

People who have had prostate surgery — either removing part or all of the prostate gland — may experience penile shrinkage following the procedure. Research suggests that approximately 15%–71% of people who undergo a radical prostatectomy experience some degree of penile shortening. Researchers believe this occurs for two main reasons. First, during surgery, the urethra reconnects to the bladder in a way that draws it slightly deeper into the pelvis, which may reduce visible penile length. Second, nerve and blood vessel damage from the surgery can reduce blood flow and oxygen to the penis, which may lead to tissue changes that contribute to shortening over time. Penile length may partially or fully recover over the months to years following surgery.

Some research also suggests that certain medical treatments for prostate cancer, such as radiation therapy combined with hormone therapy, may contribute to penile shortening.

Aging and poor blood flow 

As the body ages, blood flow to the penis may decrease due to changes in the blood vessels, similar to how circulation may decline elsewhere in the body. Good blood flow is important for healthy erections and overall penile health.

Over time, reduced blood flow and lower oxygen levels in penile tissue may lead to changes in the penis itself, including a loss of smooth muscle and elastic fibers and an increase in stiffer, fibrous tissue. These changes may contribute to reduced penile size and are more common in people with risk factors such as high blood pressure, diabetes, high cholesterol, or smoking. 

Long-term erectile dysfunction

Some research suggests that erectile dysfunction (ED) may be linked to reduced penis size.  

One study found that men with ED had shorter penile length compared to men without ED. Health conditions that often go along with ED — such as diabetes — may make these changes more likely by causing additional damage to blood vessels and nerves in the penis.

Erections act like "exercise" for penile tissue — they deliver oxygen-rich blood that helps keep the tissue flexible and healthy. When erections become less frequent due to health issues or aging, the reduced blood flow can lead to gradual tissue changes that may affect penile size over time. That said, having ED does not mean shrinkage will definitely happen, and getting treatment for ED early on may help keep penile tissue healthy.

Low testosterone

Testosterone plays an important role in sexual health and may affect penile health more broadly. As testosterone levels naturally decline with age, the flexible muscle tissue inside the penis may gradually break down. Over time, this lost tissue may be replaced by stiffer, scar-like material. These changes may contribute to erectile dysfunction and, in some cases, a slight decrease in penile size.

Diabetes 

Diabetes is a known risk factor for ED. In people with diabetes, erections that are less firm than usual may create the impression of a smaller penis. 

However, diabetes can also cause actual structural changes inside the penis which include the buildup of stiffer tissue and loss of flexible fibers that can affect both erections and penile size over time. 

For those concerned about penis shrinkage, the following measures may help. 

Lose weight

For people with overweight or obesity, losing weight may help the penis appear larger. Weight gain around the abdomen may conceal part of the penile shaft, so reducing body fat in the abdominal area may help restore visible length.

For those who find it difficult to lose weight through lifestyle changes alone — such as adjusting eating habits, exercising, and maintaining a caloric deficit — speaking with a healthcare provider about weight loss medications, such as a GLP-1 medication, may be worth considering.

In addition to improving the appearance of the penis, losing weight may also support overall erectile function.

Maintain a healthy lifestyle

Many factors affect sexual health and erectile function. Maintaining a healthy lifestyle can support overall health and, in turn, positively influence sexual health and erectile function. These may include:

• Quitting smoking

• Avoiding excess alcohol

• Exercising regularly

• Maintaining a nutritious eating plan

• Getting adequate sleep

• Managing stress

Get treatment for erectile dysfunction

For those experiencing ED, speaking with a healthcare provider about treatment options is recommended. Addressing long-term ED and infrequent erections may help reduce the risk of penile shrinkage.

A healthcare provider may suggest lifestyle changes — such as quitting smoking or reducing alcohol intake. Prescription medications such as Viagra (sildenafil) or Cialis (tadalafil). Penis pumps may also be an option worth discussing.

Penile rehabilitation after prostate surgery

For those undergoing prostate surgery, it is worth knowing that some loss of penile length is possible. Speaking with a surgeon about penile rehabilitation options before and after the procedure is advisable. Options may include pelvic floor physical therapy or the use of a vacuum erection device (also known as a penis pump).

Get treatment for Peyronie’s disease

For those with Peyronie's disease, treatment may help prevent further penile shortening. Depending on the severity of the condition, options may include vacuum erection devices, penile traction devices, oral medications, injections, or surgery.

If you’ve noticed that your penis seems to be shrinking, you may want to speak with a healthcare provider. This is especially important in the following situations:

• The shrinkage is significant or sudden

• Pain occurs during erections

• The penis has a severe curve

• Ongoing ED is present

• Other unexplained health symptoms are present

A healthcare provider can then conduct an evaluation to assess overall health and identify what may be contributing to penile shrinkage.

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For those concerned about penis shrinkage, the following points are worth noting:

• Most people who experience a small degree of penis shrinkage — regardless of the cause — are still able to enjoy a satisfying sexual life.

• The penis may temporarily shrink due to cold temperatures; this is fully reversible.

• Peyronie's disease, abdominal weight gain, and prostate surgery may all contribute to noticeable penile changes.

• Diabetes, aging, low testosterone, and long-term erectile dysfunction may also play a role, though changes from these causes tend to be more gradual and subtle.

• Anyone concerned about penis shrinkage or other unexplained health symptoms should consult a healthcare provider.