| Location | Etiology of stricture | |
| Anterior urethra | Meatus | Instrumentation, iatrogenic, hypospadias, skin disorders (lichen sclerosus) |
| Pendulous urethra | Instrumentation, iatrogenic, hypospadias, skin disorders (lichen sclerosus), sexually transmitted infections, crush injury | |
| Bulbar urethra | Instrumentation, iatrogenic, skin disorders (lichen sclerosus), sexually transmitted infections, crush injury, straddle-type injury | |
| Posterior urethra | Membranous urethra | Instrumentation, pelvic fracture with urethral distraction defects |
| Prostatic urethra | Instrumentation, radiation therapy for prostate cancer (external beam radiation therapy, brachytherapy) | |
| Bladder neck | Instrumentation, radiation therapy for prostate cancer (external beam radiation therapy, brachytherapy) | |
