For the past few months my girlfriend has been menstruating consistently and has gained a considerable amount of weight, mainly in her abdomen. It was gradual, starting around the same time as the menstruation issue, and has plateaued for the past month or so. She's been tested and isn't pregnant for sure. So what else could the problem be? I keep encouraging her to go to her physician and to let them have a look but she seems not to be too concerned. She has since been to her obgyn and was told just to wait it out and that it would eventually resolve itself but I'm still concerned. Thank you in advance.