Do you say “She’s on her period”, or “She has her period”?
Which one do you hear more often?
She’s having her period.
PMS’ing would probably be more common.
You could say, " She suffers from female hysteria." Heh. “don’t we all.”
Forsooth, milady doth be under the red curse.
What?
One vote here for “She’s having her period” or “She has her period.” “On her period” always sounds to me like the sort of thing to say if you would also describe sex as “going all the way.” Perhaps also an ungrammatical morphing of the less delicate “on the rag.”
She has her period or she’s on the rag…and all those other ones.
Others would include:
‘She’s got the painters in’
‘Aunt Flo’s in town’
‘She’s surfing the crimson wave’ or just ‘She’s surfing’ (I first heard this in the movie Clueless)
One that Dubliners sometimes use is
‘She’s in her flowers’
Or you could use the polite and old-fashioned
‘She’s indisposed’ or ‘She’s a little under the weather’ (the last is a bit ambiguous though).
“Having.”
Also known as “having a red-letter day.”
Yeah, I agree. I always cringe when I hear it, but I don’t really know why.
Riding the cotton pony.
She’s suddenly developed an interest in roller skating and horse riding!
In my neck or the woods it would be she’s got her period. But then we pretty much use the language as we please in the North of England.
I hear “on her period” most often. I’m from Oklahoma, if it’s maybe a regional thing.
Cursed
She’s got her period or she has her period. Chicagoan here.
I have my period, or I’ve got my period. My step-sister will say “I’m on my rags”. Don’t know where she got that from.
the rags comments probably derived from home-made contraptions for dealing with the start of the female cycle … or modern day glad-rags or goddess-rags.
I generally just say I’m at the start of my cycle (I’m a charter) or that I’m mensturating.
Usually I hear it as an excuse of sorts … “It’s her period”.
It really depends upon who’s doing the asking and why. For example, my husband still has trouble accepting that girls pee and poop, and he’s still not exactly comfortable talking about periods. We still have sex during my period, but if he wants to go down on me, I’ll just gently grab his chin and say, “Why don’t you wait until next week?” If it’s a doctor, family member, or close friend, I’ll usually just say bluntly that I’m on my period. If it’s someone I don’t know that well (i.e., female co-worker, an extremely (overly) friendly female clerk, or other individual) , I probably wouldn’t talk about it that bluntly, if at all, even if directly asked.
A family colloquialism (my family, obviously) is “pidge-time”. Where from? pidge → pigeon and… I have no idea where “pigeon” for “period” came from, except that my mom would mark the calendar with a tiny bird (the curved ‘v’ shape like a flying silhouette) to keep track of her cycle.
Otherwise:
She has/got her period
She’s ragging
(my favorite, that I don’t actually say (much), but is so damn funny):
It’s Shark Week, here. 
I say that I “have my period,” but I mostly hear “on her period” around here from everyone else.
Definitely has - never heard it as being on.
Or - “She fell off the roof”.
Susan
Hehehehee…this is immediately what I thought!
Around here, I say “it’s that time of the month”. Though if I had to choose one of your options, I would go with “She’s on her period”.
If someone says “She’s got her period”, I’m thinking that they’re talking about a young girl who is starting menses for the first time.
Likewise, if someone asks “Got your period yet?”, I’m thinking they are asking if I have been initiated into womanhood. (I haven’t been asked this in a long time, thank goodness.)
I say “She’s on her period” when I’m talking in general.