| Hello,
Could something have scared your cat? A loud noise outside perhaps?
How old is she? Have you ever had labwork done? Is she healthy otherwise?
I know....so many questions.
Have you treated her with any over-the-counter flea control such as Hartz? Did you recently bathe her? Does she have dry skin?
If it's a dry/itchy skin problem, try up grading the diet to Iams Hairball if you don't already feed it. Iams Hairball has extra vegitable fiber and oils that help the lube the intestinal tract and the skin/coat as well.
Also, if you bathe her, try backing off. Cats are very clean animals and bathing them more than once per month (unless they get into something) is very drying to their skin.
See if there are strange cats hanging around outside. If there are un-neutered males or intact females roaming around marking territory, your cat may be intimidated by them.
If you think this issue is more psychological than physical, you can certainly try Feliway Comfort Zone plug in. That is a device which works just like a glad plug in only it emits a phermone that helps cats feel calm, happy, and less stressed.
You can find Feliway at your local pet supply store or ask your vet.
I hope you find the problem! Good luck.
Regards, | 
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