The male lower body has a fishy smell means that the male foreskin must be long, the foreskin has secretions that are not cleaned in time, the foreskin will wrap the glans, and in a dark and humid environment it may lead to bacterial infection. The bacterial infection will lead to a large amount of fishy smell in the lower body of men, must pay attention to cleaning in time to keep dry. At the same time, one should check whether there are neoplasms and ulcers on foreskin, glans and coronal sulcus. If there are neoplasms and ulcers, one must pay attention to whether there is a possibility of penile cancer. It is suggested that one must visit the urology department of the hospital to observe whether there are other lesions and not to delay one’s condition.