An 18-year-old male with painful urination and yellow-green discharge is likely suffering from which condition?

The symptoms described for the 18-year-old male, specifically painful urination and yellow-green discharge, are strongly indicative of a urinary tract infection or sexually transmitted infection, such as urethritis, often associated with epididymitis. Epididymitis is an inflammation of the epididymis, commonly resulting from an infection that can cause such symptoms.

The association between painful urination and discharge suggests an infection in the genitourinary system, which fits the clinical presentation of epididymitis. This condition is known to produce not only the pain associated with urination but also potential discharge due to the underlying infectious process.

Other conditions listed, such as varicocele, testicular torsion, and gynecomastia, do not typically present with a combination of painful urination and yellow-green discharge. Varicocele often involves no symptoms at all or may present with a dull ache and is related to venous dilation rather than infection. Testicular torsion primarily presents with severe, unilateral testicular pain and does not include urinary symptoms or discharge. Gynecomastia involves breast tissue development and does not have any relevance to urinary symptoms or discharge.

Therefore, the symptoms directly support a diagnosis of epididymitis, making