2. Mood Changes
PMS is characterised by sudden, often very drastic mood changes that occur with no apparent trigger. You can go from happy to sad to depressed to manic, and this is particularly a shock for people who have gone their entire lives without experiencing as much as a hint of mood fluctuations – at least not of the sort that they might now. You can rest assured that mood changes are a completely normal part of going through PMS.
It happens because your hormone levels are changing and trying to adjust themselves to a new phase of your life, and often correcting the hormone levels is more than enough to make sure that the mood changes are less severe. If not, you can also ask your doctor to prescribe a basic mood stabilizer or antidepressant to deal with your symptoms for when you experience more severe bouts of mood swings or depression.