After having had gonorrhea, stenosis of the urethra(narrowing of the urethra) and sterility may appear after discovering the disease. In the case of syphilis, if not discovered in the first stage it can appear in a second stage or in a third one, disturbing the nervous system, the cardiovascular system, the skin. That is why STDs should be combated from the beginning. In the woman there can be obstruction of the fallopian tubes (sterility) and alterations of fetus, etc.