Common causes of painful urination in men are sexually transmitted diseases, urethritis and prostatitis, according to Mayo Clinic, MedlinePlus and WebMD. STDs that present with painful urination in men include gonorrhea and genital herpes if ulcers are present.
Urethritis is an inflammation of the tubes that carry urine out of the body, says MedlinePlus. This condition is caused by both bacteria and viruses, including the pathogens that cause sexually transmitted diseases. Urethritis is also caused by injury.
Prostatitis is an inflammation or infection of the prostate, a walnut-sized gland near the bladder that produces seminal fluid, says WebMD. Men are more at risk from prostatitis if they have recently had a catheter fitted or have an enlarged prostate.