The symptom of semen flowing out while sleeping is medically called seminal emission. For young people, especially those who have just entered puberty, it is easy to have some erotic dreams about sex at night, which can induce sexual impulses and spermatorrhea, which is a normal physiological phenomenon and there is no need to worry about this situation. This happens to every man as he grows up. The second situation occurs in older people, need to consider whether there are urinary system diseases and reproductive system diseases caused by symptoms, such as prostatitis and vesiculitis, can go to the regular hospital urology department, let the doctor check, do related tests, such as semen analysis, and prostate or seminal vesicle ultrasound, according to the results of the examination to target treatment.