Women cause urinary tract infections for four main reasons: First, women’s special physiological structure of the decision, because women’s urethra is short, thick, straight state, bacteria are particularly easy to enter the bladder through the urethra, causing urinary tract infections. Women’s urethra is adjacent to the vagina and anus, and neighboring infections are especially likely to cause urinary tract infections. Second, do not pay attention to personal hygiene and unclean sexual intercourse, unclean sexual intercourse is a very common cause of female urinary tract infections, so no matter what personal hygiene attention in ordinary life, before and after sexual intercourse should also pay special attention to personal hygiene. Third, the cause of female urinary tract infections, because the immune system is low, blood or lymphatic pathway caused by urinary tract infections, but this occurrence is very rare. Fourth, the elderly women, because the body after the decline in estrogen levels, resistance to weaken, thus causing the high incidence of urinary tract infections and recurrent episodes.