Originally posted by Yunhaier:
Your lifestyle influence your PMS/mood.
Exercise would generally expend the restless in you (to redirect
Mars energy into other forms). Your sleep pattern, stress and diet
would also affect you. Avoid irregular sleep, learn to handle your
stress better and improve your diet through healthy eating.
Stress is the killer. I sincerely believe that (with first hand
experience) this affect the strength of PMS.
Avoid Coffee, Tea, Mountain Dew, Coke, Pepsi, etc (Those with
Caffeine). Also avoid chocolate when you are feeling low.
Certain drugs will alter your mood as well. (E.g. Birth Control).

***
[b]Astrological
note:
PMS is more severe with woman of prominent water...
with afflicted planetary (Cancer, Scorpio and Pisces). Esp Cancer,
where Moon is her ruling planet. This mood fluctuation is due to
the flow of the hormones cycle and changes taking place in the
woman's body. Basically, a body's reaction to these
happenings.
That is the reason why stress is one of the top reason for severe
PMS. Stress will disrupt this cycle and hinder the flow,
emotionally.
P.S: Period comes averagely about one month, which is about the
same time frame as the cycle of the moon. Moon's gravity affects
all water bodies on Earth and is no surprise that it could affect
us, being 70% water (which is ironically about the same land/water
mass percentage on Earth). 
Cheers[/b]
hehehe, your analysis is always so clear and informative
