A slight curve to the penis is completely normal, and most men have some degree of natural bend. Straightening becomes a medical question when curvature interferes with sex, causes pain, or measures beyond about 30 degrees. The approach depends on what’s causing the curve, how severe it is, and whether it’s still changing or has stabilized.
When Curvature Is Normal and When It’s Not
Many penises curve slightly to the left, right, up, or down when erect. This is just anatomy. There’s no official threshold where a curve becomes “abnormal,” but the FDA-approved injection treatment for curvature targets bends greater than 30 degrees, which gives a rough sense of when doctors consider intervention worthwhile. If your curve doesn’t cause pain and doesn’t prevent penetration, treatment may not be necessary regardless of the degree.
The two main causes of significant curvature are congenital curvature (something you’re born with) and Peyronie’s disease (something that develops later in life). These are fundamentally different conditions. Congenital curvature results from how the penis formed during development and doesn’t involve scar tissue. Peyronie’s disease, by contrast, involves a buildup of fibrous plaque beneath the skin that pulls the penis into a curve. Peyronie’s affects an estimated 1 in 10 men, most commonly between ages 40 and 70, and it can develop after injury to the penis during sex or other activity, though many men don’t recall a specific event.
Understanding the Two Phases of Peyronie’s Disease
If your curvature developed over time, it matters a great deal whether the condition is still active or has stabilized. Peyronie’s disease progresses through two distinct phases, and the timing determines which treatments are appropriate.
The first is the acute phase, when inflammation is active, the plaque is still forming, and the curve may be getting worse. This phase typically lasts up to 12 to 18 months. During this period, you may notice pain during erections, a changing shape, or new areas of hardness under the skin. Surgery is generally not performed during this phase because the condition hasn’t finished progressing.
The second is the chronic or stable phase, which begins once the plaque and curvature stop changing. For most men, this happens within 12 to 18 months of when symptoms first appeared. Once the curve has stabilized, the full range of treatment options opens up. In a small number of cases, Peyronie’s disease resolves on its own without any treatment, though this is uncommon.
Traction Devices: The Least Invasive Option
Penile traction therapy involves wearing a lightweight stretching device on the penis for a set number of hours each day. It’s the most conservative approach and can reduce curvature while also preserving or slightly increasing length. Traction can be used on its own or combined with other treatments like injections.
The commitment is significant. Most clinical studies have required men to wear the device for several hours daily over months. In one study of 55 men with Peyronie’s disease, participants wore a traction device for an average of 4.6 hours a day over six months. The results were dose-dependent: men who wore the device more than six hours daily saw curvature decrease by an average of 38 degrees, while those using it fewer than four hours daily saw a decrease of about 20 degrees.
More recently, newer device designs have shown results with shorter daily wear times. A 2020 study of 110 men found that wearing a traction device for just 30 to 90 minutes per day over three months led to improved curvature in 77% of participants, and 94% saw an increase in penis length compared to a control group. If you’re looking for a non-invasive starting point, traction therapy is worth discussing with a urologist, though it does require patience and consistency.
Injection Therapy for Moderate Curvature
The only FDA-approved injection for Peyronie’s disease works by breaking down the collagen in the scar tissue that causes the bend. It’s approved for men with stable disease whose curvature falls between 30 and 90 degrees and who can still get erections (with or without medication).
Treatment involves a series of injection cycles spaced six weeks apart, typically four cycles total, with follow-up assessments afterward. In two large clinical trials involving over 800 men, the injections reduced curvature by 33% to 35% on average. That’s a meaningful improvement, though it’s not a complete correction for most men. The real-world difference between the injection and a placebo was an additional 11% to 17% reduction in curvature, meaning some natural improvement occurred in both groups over time.
Between injection visits, your urologist will perform a “modeling” procedure, manually bending the penis to help break up the softened plaque. You’ll also be instructed to do gentle stretching exercises at home. The process takes several months from start to finish.
Surgical Options for Severe or Persistent Curvature
Surgery is typically reserved for men with stable Peyronie’s disease whose curvature is severe enough to prevent intercourse, or for men with congenital curvature who want correction. It offers the most reliable straightening but comes with trade-offs.
There are two main surgical approaches. Plication involves placing stitches on the side of the penis opposite the curve to cinch it straight, essentially shortening the longer side to match the shorter side. It’s simpler, carries a lower risk of complications, and preserves erectile function well. The downside is some degree of penile shortening, which is inherent to the technique.
The second approach, plaque incision with grafting, involves cutting into or removing the scar tissue and patching the area with a graft. This is a more complex procedure that can better preserve length in theory. However, a direct comparison of the two techniques found that satisfaction rates and perceived straightness were similar between the groups. Men who underwent grafting were significantly more likely to experience reduced rigidity, difficulty with intercourse, and loss of sensation. Men who had plication were more likely to notice palpable lumps at the stitch sites. Shortening was a common complaint regardless of which surgery was performed.
For men who have both significant curvature and erectile dysfunction that doesn’t respond to medication, a penile implant can address both problems simultaneously. The implant straightens the penis mechanically while restoring the ability to get an erection.
Vacuum Devices
Vacuum erection devices, which draw blood into the penis using negative pressure, have some limited evidence supporting a role in curvature correction. In animal studies, vacuum therapy reduced curvature compared to no treatment, though traction devices outperformed them. The clinical evidence in humans is weaker and based on smaller studies. Vacuum devices are more commonly used to help with erections than to correct curvature specifically, and the American Urological Association hasn’t issued a formal recommendation on their use for Peyronie’s due to insufficient data.
What About Oral Medications and Supplements?
You’ll find suggestions online for vitamin E, various supplements, and oral medications to treat penile curvature. The American Urological Association has reviewed the evidence for oral therapies extensively, and no oral medication has been shown to reliably reduce curvature. While some of these substances are harmless, none should be expected to straighten the penis. Your time and money are better spent on treatments with demonstrated results.
How a Urologist Evaluates Curvature
If you decide to seek treatment, a urologist will typically start by asking you to take photos of your erect penis from multiple angles at home, which gives them a baseline measurement of the curve’s direction and severity. In some cases, they’ll perform an ultrasound in the office after inducing an erection with medication. This allows them to locate and measure the plaque, assess blood flow, and determine whether the plaque is calcified (hardened), which can affect treatment choices. The degree of curvature, the stability of the disease, and your erectile function all factor into which treatment path makes the most sense.