Men’s privacy odor may be caused by not paying attention to personal hygiene or other pathological factors such as circumcision, urethritis, penile cancer and other factors. 1. Physiological factors: not changing underwear for a long time and not cleaning the genitals will cause the genital area to stink, but there is no other abnormality, you should change your underwear and clean your lower body diligently, and the odor may disappear. 2. Foreskin glansitis: long time not to the foreskin internal cleaning, easy to induce foreskin glansitis, may appear purulent infection, it will make the privacy of the odor, accompanied by itching, pain and other symptoms. 3. Urethritis: for example, gonococcal or non-gonococcal urethritis, which is related to unclean sex, can make yellow or white purulent material appear frequently at the urethral orifice area, accompanied by malodor, which will make the lower body smelly, accompanied by burning sensation in the urinary tract, itching in the urinary tract, frequency of urination, urgency of urination and other symptoms. 4. Penile cancer: it may be related to long foreskin, chronic inflammation stimulation, long time smoking and other factors, which can make penile localized cauliflower-like swelling, accompanied by ulcers, pus, foul smell and other symptoms, and in serious cases, it will be metastasized to distant places. Boys privacy odor, and the existence of other abnormal performance, may be related to disease factors, should also seek medical examination and treatment.