Hello,
Polymenorrhea or
bleeding from vagina more than once a month could be due to several
causes such fibroids, adenomyosis, endometriosis, uterine polyps, hormonal imbalance, thyroid problems and bleeding disorders. It could also be due to an IUD implant if you have one or due to oral contraceptive pills. It can also be a part of severe pelvic inflammatory disorder. STDs like Chlamydia and gonorrhea too can cause this.