Differential Diagnosis — 49-year-old Male: Midpenile Pain, Burning Micturition, Nocturia

🔴 Most Likely Diagnoses

1. Urethritis (Infectious)

• Gonococcal urethritis (Neisseria gonorrhoeae): purulent discharge, dysuria, frequency
• Non-gonococcal urethritis (NGU): Chlamydia trachomatis, Mycoplasma genitalium, Ureaplasma — clear/mucoid discharge, urethral itching, burning
• Urethral discomfort with urination and discharge is the hallmark — Goldman-Cecil Medicine

2. Urethral Calculus (Stone)

• Pain localized to the mid/penile shaft
• Burning micturition, obstructive symptoms
• Posterior urethral stones → perineal/rectal pain; pendulous urethral stones → pain at penile tip or shaft
• Campbell-Walsh Urology: "those in the pendulous urethra have pain at the penile tip…patients with primary urethral calculi have more insidious symptoms of persistent pain during voiding, obstructive lower urinary tract symptoms"

3. Benign Prostatic Hyperplasia (BPH)

• BPH is the most common benign prostatic disease in males >50, and symptoms can begin in the late 40s
• Classic LUTS: nocturia, daytime frequency, urgency, dysuria, hesitancy, weak stream
• Differential per Swanson's Family Medicine: "These symptoms include nocturia, daytime frequency, urgency, urge incontinence, and dysuria. Differential diagnosis includes carcinoma of the prostate, neuropathic bladder, chronic prostatitis, and urethral stricture"

4. Chronic Prostatitis / Chronic Pelvic Pain Syndrome (CP/CPPS)

• Perineal, penile, or pelvic pain + irritative voiding symptoms (dysuria, nocturia, frequency)
• Most common prostatitis syndrome in men under 50
• Pain can radiate to shaft/mid-penis; pain during/after ejaculation is characteristic
• Can coexist with urethritis-like symptoms

🟡 Important Considerations

5. Urethral Stricture

• Obstructive + irritative voiding: weak stream, straining, nocturia, dysuria
• Often post-infectious (gonorrhea, chlamydia) or post-traumatic/iatrogenic
• Can cause stasis and secondary UTI/prostatitis
• Smith & Tanagho's General Urology lists urethral stricture in the differential of LUTS + dysuria

6. Cystitis / Urinary Tract Infection (UTI)

• Less common in males of this age, but possible
• Suprapubic pain, frequency, nocturia, burning
• When present, an underlying structural or functional cause (BPH, calculus, stricture) must be sought

7. Interstitial Cystitis / Bladder Pain Syndrome (IC/BPS)

• Chronic pelvic/urethral pain + irritative voiding symptoms in the absence of infection
• Campbell-Walsh Urology: dysfunctional voiding patterns may mimic IC/BPS; nocturia is prominent
• More common in women, but can occur in men — often under-recognized

8. Lichen Sclerosus (BXO — Balanitis Xerotica Obliterans)

• Chronic inflammatory dermatosis affecting glans penis and foreskin
• Presents with pruritus, penile pain, dysuria
• Can cause meatal/urethral stenosis → obstructive + irritative voiding symptoms (nocturia)
• Dermatology 2-Volume Set: "affects glans penis and foreskin; presents with pruritus, pain"

9. Penile Carcinoma / Urethral Carcinoma

• Less common but must be considered with persistent midpenile pain, especially with visible lesion
• Campbell-Walsh Urology differential for penile lesions includes primary tumors

10. Referred Pain — Ureteric/Renal Calculus

• A distal ureteric stone can cause referred pain to the tip or shaft of the penis (via the genitofemoral nerve L1-L2)
• May mimic urethral pain; flank/colicky component may help differentiate

🟢 Rarer / Contextual Causes

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