There are many causes of pain after ejaculation, which can be divided into functional, psychological and organic causes. The first functional cause is caused by too frequent sexual intercourse, especially after a new marriage, which can lead to pain after ejaculation. The second psychological reason is the mental stress, doubts about sexual ability, anxiety and tension when having sex, which leads to muscle spasms, in addition to neurosis, glans over-sensitive, is also the main cause of pain after ejaculation. Thirdly, organic causes are due to certain diseases that cause pain after ejaculation, such as chronic prostatitis, epididymitis, vesiculitis, posterior urethritis, spermatorrhea and so on. The pain after ejaculation is an abnormal symptom, and it is recommended that men who have pain after ejaculation must go to the hospital as soon as possible to do the corresponding examination to clarify the cause and treat it as soon as possible.