An upward curve during an erection is one of the most common penile shapes, and in most cases it’s completely normal. Some degree of curvature, whether up, down, or to one side, is present in a large number of men and rarely causes problems on its own. The curve becomes a medical concern only when it’s severe enough to cause pain, makes sex difficult, or appears suddenly after years of straight erections.
There are two distinct reasons a penis curves: you were born that way, or something changed the tissue inside your penis later in life. Understanding which category you fall into matters, because the causes, outlook, and treatment options are very different.
Congenital Curvature: You Were Born With It
If your penis has curved upward for as long as you can remember, you likely have congenital penile curvature. This is a developmental variation that forms before birth, related to how the elastic tissue inside the penis grows during fetal development. The exact cause isn’t fully understood, but it has nothing to do with injury or scar tissue. It’s simply the way your anatomy developed.
Congenital curvature is usually mild and doesn’t get worse over time. Most men with this type of curve never need treatment. It only becomes a clinical issue if the degree of curvature is significant enough to interfere with sexual function or cause distress. Many men don’t even realize their curve is unusual until they see other penises or a partner mentions it.
Peyronie’s Disease: A Curve That Develops Later
If your upward curve is new, or if a mild curve has recently gotten more pronounced, the likely explanation is Peyronie’s disease. This condition develops when scar tissue (called plaque) forms inside the tough outer sheath of the penis. That sheath normally stretches evenly during an erection. When a patch of scar tissue forms on the top surface, that spot can’t stretch as well as the surrounding tissue, so the penis bends toward the scar, pulling upward.
The plaque most commonly forms on the top (dorsal) surface of the penis, which is why upward curvature is the most frequent direction for Peyronie’s-related bending. The scar tissue can result from an injury to the penis, even a minor one during sex that you might not remember, or from a connective tissue disorder. In many cases, no clear triggering event is identified.
Peyronie’s disease typically progresses through two phases. The acute phase lasts roughly 6 to 18 months, during which the curvature may worsen and erections can be painful. Once the plaque stabilizes, pain usually fades, but the curve remains. About half of men with Peyronie’s disease also develop some degree of erectile difficulty, either from the scar tissue itself or from the psychological impact of the change.
How Much Curvature Is Normal
There’s no official cutoff between “normal curve” and “problem curve.” The American Urological Association notes that there is no agreed-upon minimum curvature necessary before intervention. What matters most is function: can you have comfortable, satisfying sex? If the answer is yes, even a noticeable curve doesn’t require treatment.
That said, curvature beyond about 30 degrees is the point where treatment options open up, and curves approaching 60 to 90 degrees almost always interfere with penetration. If you’re unsure about the degree of your curve, a urologist can measure it precisely using an ultrasound performed during an erection. During this exam, medication is injected into the shaft to produce an erection, and then a probe measures blood flow and the angle of curvature to help guide treatment decisions.
Treatment for Mild to Moderate Curvature
For curves between 30 and 90 degrees caused by Peyronie’s disease, the only FDA-approved medication is an injectable enzyme treatment that breaks down the scar tissue. In clinical trials, men who received this treatment saw their curvature decrease by about 34% over a year, compared to roughly 20% improvement in men who received a placebo. The treatment also significantly reduced how bothered men felt about the condition. It requires multiple office visits for injections, combined with a modeling technique where the physician and patient manually stretch the plaque between sessions.
Traction devices, which gently stretch the penis over time, are sometimes used alongside injections. Research shows that using a traction device for at least 3 hours per day can produce a small but meaningful gain in stretched penile length, though the effect on curvature itself is less clear. The commitment required is substantial, and results are modest.
When Surgery Makes Sense
Surgery is typically reserved for men with stable Peyronie’s disease (meaning the curve has stopped changing) who haven’t responded to other treatments or who have severe curvature. There are two main surgical approaches, each with distinct tradeoffs.
Plication (often called the Nesbit procedure) works by shortening the longer side of the penis to straighten it. It’s best suited for curves under 60 degrees. The operation takes one to two hours, and the risk of erectile problems afterward is about 5%. The main downside is that almost all patients experience some shortening of the penis, since the procedure works by making the longer side match the shorter side.
Plaque incision and grafting cuts into the scar tissue to release the tension and fills the gap with a tissue graft. This approach handles more severe bends and causes less shortening (about 20% of patients), but it carries a higher risk: roughly 25% of men experience some degree of erectile difficulty afterward, and the same percentage report temporary or permanent numbness. The procedure takes about three hours.
Recovery from either surgery involves going home within one to two days. Stitches dissolve in two to three weeks, and all sexual activity needs to be avoided for six weeks.
What to Pay Attention To
If your curve has been there since puberty, is painless, and doesn’t interfere with sex, it’s almost certainly a normal anatomical variation that needs no treatment. Many partners find an upward curve pleasurable, as it can increase stimulation of the front vaginal wall during intercourse.
The signs that something has changed and warrants a urologist visit are more specific: a curve that appears or worsens over weeks to months, pain during erections, a hard lump you can feel under the skin of the shaft, or difficulty maintaining an erection. Catching Peyronie’s disease during the acute phase gives you the widest range of treatment options before the scar tissue fully hardens.