PMSbuddy.com PMS Tips
There are many things you can do to help lessen the negative effects of PMS in any relationship (spouse, friend, relative, coworker, etc.).
First and foremost, don't ask "Do you have PMS? It sure seems like it" whenever she isn't being a perfect angel. This can put women on the spot and make them feel attacked, not to mention a good way to get into an unnecessary fight. Instead, talk to her, be supportive and understanding, and you are sure to get better results.
There are also many things that women can do to improve PMS ranging from diet, to treatment, to lifestyle changes. This information is readily available online, and is something to discuss with a doctor.
However, if you do not suffer from - but suffer because of - PMS, here are some nice things you can do to make her feel better: