If you believe this to be part of PMS, there are some things you can try.
Health Central has a page about your period. And here is a good article on bloating and PMS from the Mayo Clinic.
But only a doctor can examine you and determine if there is anything else causing this symptom. It would be a good idea to make that part of your questions while getting a pelvic exam. That second article gives some ideas for asking the right questions when you go. If it is bloating from PMS both articles give some examples you can try, to minimize the discomfort.
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