The yellowish water and fishy odor just after menstruation is considered to be the presence of inflammatory infections of the reproductive system. It may be vaginitis, acute cervicitis, pelvic inflammatory disease, and endometritis, may appear yellow water, and fishy odor. Fishy odor is mostly caused by anaerobic infections, resulting in the presence of a bad smell. In this case, you need to consider going to the hospital for routine gynecological examination and secretion tests and pelvic ultrasound examination to comprehensively analyze and clarify the diagnosis. According to the results of the examination, you can take anti-anaerobic drugs to carry out symptomatic treatment, such as metronidazole, tinidazole, ornidazole and other azole drugs to carry out symptomatic treatment, the relative effect is better, at the same time you can cooperate with gynecological cleaning, red nuclear lotion and other lotions to clean. Eat a light diet, drink plenty of warm water, do a good job of personal hygiene, change underwear, treatment period to prohibit sexual intercourse.