What seems like PMS can sometimes be caused by another
condition. It's important to know, because your treatment options will be
different if your symptoms aren't actually linked to premenstrual hormone
changes. The best way to learn whether your symptoms are premenstrual is to
know when you ovulate (the day you ovulate is the start of your premenstrual
phase). Keep track of ovulation days, a daily record of your symptoms, and
menstrual bleeding days in a
menstrual diary(What is a PDF document?). There are many ways to record symptoms so you can find one that works for you.