Cloudy discharge from penis in morning.mild testicle and groin pain throughout the day. frequent urination stops after ejaculation. chlamydia and gonnorhea negative.in urine culture no growth. in semen analysis, everything normal. kindly advise?

By UPTODATE: C. trachomatis is generally the most commonly identified cause of nongonococcal urethritis (NGU), with Mycoplasma genitalium the second most common; however, almost half of all cases of NGU do not have a specific etiology. Your symptoms are consistent with sexual related urethritis. I will treat empirically with Doxycycline 100 mg, twice a day for seven days as a trial.