A small amount of blood during coitus may be caused by too much force during coitus, irritating the cervix of the uterus and the vaginal wall, causing a small amount of spotting bleeding. Because the vaginal wall and cervix are rich in blood vessels and also relatively fragile, if you do not pay attention during intercourse, it may cause such a situation. If there is a gynecological disease, such as vaginitis, when there is edema in the vaginal mucosa, coitus may also cause spotting bleeding. If there is cervical erosion, when intercourse stimulates the surface of the erosion, it is possible that spotting bleeding may also occur. However, such bleeding usually ends within 3 days and does not last long, so it is recommended to observe. During the bleeding period, coitus is prohibited, so as not to cause cross-infection again.