The symptoms of sexually transmitted diseases in men are skin and mucous membrane damage, urethral irritation, blisters, small pimples, etc. They need to be analyzed by type, such as syphilis, gonorrhea, genital chlamydia, condyloma acuminatum, genital herpes, AIDS, etc. It is recommended to consult with a specialist. 1. Syphilis: in the first stage, there may be hard chancre and sclerosing lymphadenitis; in the second stage, there may be skin and mucous membrane damages such as syphilis rash, etc., as well as bone and joint damages, nerve damages, etc.; in the third stage, there may be skin and mucous membrane damages such as nodular syphilis rash, etc., and cardiovascular syphilis in the severe cases. 2. Gonorrhea: early frequency of urinary urgency and urinary pain, urethral urethral redness and swelling, accompanied by inguinal lymphadenitis, may have terminal hematuria, hematospermia. There can also be complications, such as gonococcal prostatitis, gonococcal vesiculitis, etc. There can be fever, scrotal swelling and pain. 3. Chlamydia infection of the genital tract: common manifestations include itching or burning sensation in the urethra. The lack of active treatment can cause epididymitis, prostatitis, etc., appear perineal dull pain, penile pain, etc.. 4. Condyloma acuminatum: the glans, penis, etc. can have scattered reddish pimples, most of them are asymptomatic, a few have burning pain or discomfort during sexual intercourse. 5. Genital herpes: the initial outbreak is often a cluster or scattered small blisters, self-conscious pain, often accompanied by inguinal lymph node swelling and pain, fever and so on. Recurrent herpes can have prodromal symptoms, such as localized burning sensation. 6. AIDS: acute HIV infection can have weakness and other general discomfort, asymptomatic infection without any manifestations, AIDS can have fever, diarrhea, weight loss, generalized lymph node enlargement, etc., often combined with opportunistic infections, such as herpes virus infection, toxoplasmosis. Men suspected of having sexually transmitted diseases are actively diagnosed and treated.