Why Is My Penis Burning? Causes and When to See a Doctor

A burning sensation in the penis almost always traces back to inflammation somewhere along the urinary or genital tract, and the most common triggers are sexually transmitted infections, contact irritants, and yeast overgrowth. The sensation can range from a mild sting during urination to a persistent, deep ache that lingers between bathroom trips. Because the list of possible causes spans infections, skin conditions, structural problems, and even nerve disorders, figuring out what is behind the burning matters for choosing the right treatment and avoiding complications.

Sexually Transmitted Infections Are the Leading Infectious Cause

When a burning feeling appears inside the urethra, especially during or just after urination, sexually transmitted infections sit at the top of the suspect list. In men with urethritis confirmed by lab testing, chlamydia is by far the most common single-pathogen cause, followed by Mycoplasma genitalium and then gonorrhea.¹ Gonorrhea tends to announce itself more dramatically: it provokes the most intense inflammatory response in the urethra and often produces a visible, thick discharge within days of exposure.¹ Chlamydia and Mycoplasma genitalium cause a more moderate level of inflammation, which is why their symptoms can be subtler and easier to dismiss as “just irritation.”

Mycoplasma genitalium deserves special attention because it is a frequent culprit behind burning that does not go away after a standard course of antibiotics. In one study of men whose urethritis persisted or came back after doxycycline treatment, Mycoplasma genitalium was detected in about four out of ten cases.² This organism does not respond well to the antibiotics typically prescribed for chlamydia, so if your burning lingers after treatment, your doctor may need to test for it specifically.

Genital herpes is a different kind of burn. Rather than an internal urethral sting, herpes tends to cause burning or pain on the skin surface, often alongside clusters of small blisters or ulcers. During a first outbreak, roughly two-thirds of people develop systemic symptoms like fever and body aches, and painful urination occurs in a majority of cases.³ The lesions are typically distributed on both sides and can last around two to three weeks untreated. Recurrent outbreaks are usually shorter and milder, but they can still produce that unmistakable surface-level burning.

Trichomoniasis is sometimes mentioned as a cause, but it accounts for only a small fraction of male urethritis and produces very little inflammatory response in the urethra compared to other STIs.¹ Many men who carry it never develop noticeable symptoms.

Yeast Infections and Balanitis

Penile yeast infections are more common than many men realize. Candida balanitis, an overgrowth of yeast on the head of the penis, is the most frequent fungal infection in that area.⁴ The burning in this case is usually on the outer surface of the glans rather than deep inside the urethra. You might also notice redness, itching, a whitish coating, or small cracked patches on the skin. Uncircumcised men are more susceptible because the warm, moist environment under the foreskin favors yeast growth.

Diabetes is a major risk factor. High blood glucose promotes yeast attachment and growth while simultaneously weakening the local immune defenses, and Candida balanitis occurs almost exclusively in uncircumcised men with diabetes, especially when blood sugar control is poor.⁵ If you find yourself dealing with recurrent yeast-related burning and you have not had your blood sugar checked recently, that is worth discussing with your doctor.

Contact Dermatitis and Everyday Irritants

Not every case of penile burning involves an infection. Contact dermatitis, meaning skin inflammation from direct exposure to an irritant or allergen, is a common and frequently overlooked cause. Allergic reactions can be triggered by latex condoms, lubricants containing propylene glycol, spermicides, and even some feminine hygiene products that transfer during contact.⁶ The burning tends to appear on the outer skin rather than inside the urethra, and it often comes with redness, itching, or a rash.

More often, though, the dermatitis is irritant rather than allergic. Persistent moisture, friction, and even overly aggressive washing with scented soaps are the usual offenders.⁷ Ammonia released from urine residue that sits against the skin can also irritate the glans and foreskin, which is why poor hygiene and excessive hygiene can both lead to the same burning sensation.⁷ If your symptoms started shortly after switching to a new soap, detergent, condom brand, or lubricant, removing that product from the equation is the fastest diagnostic test you can run at home.

Prostatitis and Deeper Pelvic Inflammation

When burning is not clearly linked to the skin or the urethra, the prostate gland can be the hidden source. Prostatitis, particularly the chronic form sometimes called chronic pelvic pain syndrome, is one of the most common causes of lower urinary tract symptoms in younger men.⁸ The pain or burning often feels more diffuse, sometimes radiating to the perineum, the lower abdomen, or the tip of the penis. Men with the inflammatory subtype of chronic prostatitis tend to report more frequent and more severe symptoms, including penile pain, a weak urinary stream, and difficulty with erections.⁹

This condition is notoriously frustrating because urine and semen cultures often come back clean, leaving doctors and patients with a diagnosis of exclusion. Treatments vary widely and can include antibiotics (if bacteria are found), anti-inflammatories, pelvic floor physical therapy, and lifestyle changes. If your burning persists for weeks without a clear cause and is accompanied by urinary frequency or pelvic discomfort, prostatitis is a diagnosis worth exploring.

Lichen Sclerosus

Lichen sclerosus is a chronic skin condition that most people have never heard of, yet it can cause significant burning, itching, and pain on the penis. It typically begins as white, shiny patches on the glans or foreskin that may look harmless at first. Over time, the affected skin can thin out, crack, and become scarred. As the disease progresses, it can cause tightening of the foreskin, difficulty urinating if the meatal opening narrows, and pain during erections.¹⁰

The burning from lichen sclerosus tends to be persistent and worsens with friction or urine contact on the damaged skin. It is often misdiagnosed as a yeast infection or contact dermatitis early on, since the symptoms overlap. A biopsy is usually needed for confirmation. Treatment with potent topical steroid creams can control mild to moderate cases, but advanced scarring sometimes requires surgical correction. This is a condition that benefits from early diagnosis, so white patches on the penile skin that do not resolve on their own are worth showing to a dermatologist or urologist.

Urethral Stricture

A urethral stricture is a narrowing of the urethra caused by scar tissue, and it can produce both obstructive symptoms (a weak or split stream, straining to urinate) and irritative symptoms like burning and urgency. Roughly half of all urethral strictures result from medical procedures like catheterization or urological surgery, about a third have no identifiable cause, and around one in five are linked to previous bacterial urethritis.¹¹ This means that an STI you treated and forgot about years ago could leave behind scar tissue that starts causing burning much later.

The burning in this case tends to come with a noticeably slower or thinner urinary stream, and you may feel like you cannot fully empty your bladder. Left untreated, a significant stricture can back up pressure into the bladder and eventually affect kidney function.¹¹ Diagnosis usually involves imaging of the urethra or a scope exam. Mild strictures can be dilated, but more severe or recurrent ones may require surgical reconstruction.

Nerve-Related Burning

Sometimes the burning has nothing to do with infection, skin damage, or a structural blockage. Pudendal nerve entrapment, in which the nerve that supplies sensation to the perineum and genitals becomes compressed, can produce chronic burning pain in the penis, perineum, or rectal area. The hallmark feature is that the pain worsens with sitting and improves when standing or lying down.¹² Along with the burning, people with this condition often develop urinary hesitancy, frequency, urgency, and sexual dysfunction.¹²

Pudendal entrapment is uncommon and tends to be diagnosed only after infections, dermatological conditions, and structural problems have been ruled out. Prolonged cycling, pelvic surgery, and repetitive strain are risk factors. Treatment ranges from nerve blocks and physical therapy to, in severe cases, surgical decompression. If your burning has a neuropathic quality, meaning it feels like electric shocks, pins-and-needles, or a constant raw sensation unrelated to urination, and it has a clear positional component, this diagnosis deserves consideration.

Medications That Can Trigger Burning

A class of diabetes drugs called SGLT2 inhibitors (brand names include empagliflozin, dapagliflozin, and canagliflozin) works by pushing excess glucose out through the urine. That glucose-rich urine, however, creates a friendlier environment for yeast and bacteria in the urogenital tract. Clinical safety data for these drugs consistently show a higher rate of genital yeast infections in users, and there is also an association with urinary tract infections.¹³ In rare cases, these medications have been linked to a serious deep-tissue infection called Fournier gangrene, though that is uncommon enough that it should prompt awareness, not panic.¹⁴

Urogenital candida infections are growing more pervasive in people with diabetes generally, and SGLT2 inhibitors appear to compound the risk by increasing urinary glucose excretion.¹⁵ If you started one of these drugs recently and then developed penile burning, your prescriber should know. Most of these infections are mild to moderate and respond to antifungal treatment without needing to stop the diabetes medication, but the pattern is important to identify.

How to Tell These Causes Apart

Location and timing are your best initial clues. Burning that occurs inside the urethra during urination points toward an STI, a urinary tract infection, or a stricture. Burning on the outer skin surface that is visible as redness, cracking, or a rash suggests contact dermatitis, yeast, or lichen sclerosus. A diffuse ache or burning that radiates beyond the penis itself, especially into the perineum or pelvis, is more consistent with prostatitis or nerve entrapment.

Timing matters too. Burning that appeared a few days to two weeks after unprotected sexual contact suggests an STI. Burning that started after switching personal-care products or condom brands is more likely irritant dermatitis. Chronic burning that has persisted for months, worsens with sitting, and comes with urinary hesitancy suggests a structural or neurological cause.

Discharge is another useful signal. A thick, yellow-green discharge is classic for gonorrhea. A thinner, clear-to-white discharge is more common with chlamydia. No discharge at all, combined with external skin changes, steers the diagnosis away from urethritis and toward a dermatological or nerve-related cause.

When to See a Doctor

Some cases of penile burning resolve on their own. If you switched to a new soap and developed mild irritation, stopping the soap and keeping the area clean and dry for a few days is a reasonable first step. But several scenarios warrant a prompt visit:

Any discharge: Even a small amount of clear or colored discharge, especially after unprotected sex, should be tested for STIs.
Visible sores or blisters: These could be herpes, syphilis, or another infection that requires specific treatment.
Burning with fever or body aches: Systemic symptoms suggest an infection that needs antibiotics or antivirals.
Persistent burning beyond a week: If it is not resolving with simple hygiene changes, something deeper is going on.
Difficulty urinating or a weak stream: This combination raises the possibility of a stricture or significant urethral inflammation.
Recurrent burning after treatment: As noted earlier, Mycoplasma genitalium and other resistant organisms may need targeted testing.

At the visit, expect a urine sample to be collected for testing. Modern nucleic acid tests can detect chlamydia, gonorrhea, and trichomoniasis from a urine sample or a self-collected swab with high accuracy.¹⁶ If an STI is suspected, your doctor may also recommend blood tests for syphilis and HIV. For cases where skin changes are present, a visual exam and sometimes a swab for yeast are usually enough to guide treatment. More complex cases, especially those involving chronic burning, urinary flow problems, or suspected nerve involvement, may require referral to a urologist.

Why Self-Diagnosis Falls Short

The overlap between these causes is wider than most people expect. Yeast infections and contact dermatitis can look identical on the skin. Chlamydia and Mycoplasma genitalium produce nearly the same symptoms in the urethra. Prostatitis mimics a urinary tract infection. And a healing STI can leave behind a stricture that produces burning years later, long after the original infection is gone. Over-the-counter antifungal creams can mask symptoms without addressing an underlying STI, and self-prescribing antibiotics through online services without proper testing risks selecting for resistant organisms. The evidence consistently points to testing as the dividing line between guessing and knowing, and the tests themselves have become much less invasive than they used to be. A urine cup or a self-swab can answer in a few days what weeks of home experimentation cannot.

1
PLOS ONE. Profile of sexually transmitted infections causing urethritis and a related inflammatory reaction in urine among heterosexual males: A flow-cytometry study
2
PubMed. Mycoplasma genitalium: a common cause of persistent urethritis among men treated with doxycycline
3
PubMed. Genital herpes simplex virus infections: clinical manifestations, course, and complications
4
PubMed. Mycotic infections of the penis
5
PubMed. Genital mycotic infections in patients with diabetes
6
PubMed. Common skin disorders of the penis
7
PubMed Central. Penile Inflammatory Skin Disorders and the Preventive Role of Circumcision
8
PubMed. Lower Urinary Tract Symptoms in Young Men-Causes and Management
9
Urology. Symptoms and inflammation in chronic prostatitis/chronic pelvic pain syndrome
10
PubMed Central. Penile Lichen Sclerosis: A Surgical Perspective of its Aetiology and Treatment
11
PubMed Central. Urethral stricture: etiology, investigation and treatments
12
PubMed. Pudendal entrapment as an etiology of chronic perineal pain: Diagnosis and treatment
13
PubMed Central. Genital Infections with Sodium Glucose Cotransporter-2 Inhibitors: Occurrence and Management in Patients with Type 2 Diabetes Mellitus
14
The Journal for Nurse Practitioners. Type 2 Diabetes: SGLT2i-Associated Genitourinary Infections and Lower Urinary Tract Dysfunction
15
PubMed Central. Growing importance of urogenital candidiasis in individuals with diabetes: A narrative review
16
PubMed Central. Comparison of self-obtained penile-meatal swabs to urine for the detection of C. trachomatis, N. gonorrhoeae and T. vaginalis