Is this true? Girls and women, I need your answers. Thanks.?

Question

Hi, I've heard and noticed myself that if you're sitting next to another girl or woman as well as have a female roommate for over a period of time, your periods coincide. Have you ever heard of this or have you personally experienced this? I've noticed it myself when I worked as a TA, and a Japanese classmate from my grad school also told the same story. I'm very curious why this happens if it's true and has happened to numerous girls or women. Can someone offer me an explanation please? Thanks.

Answer 1

Yes, it is true and it known as "cycling" or "synchronizing".

Here are some websites about it:

This first link is from Dr Martha McClintock of the University of Chicago who did research on the study.

http://www.abc.net.au/rn/talks/8.30/helthrpt/stories/s11122.htm

http://serendip.brynmawr.edu/biology/b103/f03/web3/j1wise.html

http://www.straightdope.com/classics/a2_306.html

Hope this answers your questions about it.

Answer 2

I think it is true...one time, me and my friend spent some time together and her period came on a day earlier than expected. Now mine wasn't due for another 3 or 4 days but sure enough, as soon as I got home mine came on too. I think it may have been a coincidence, but if it is true, maybe it's caused by the fluctuations our hormones around each other, thereby triggering our hormones to react with the homeostasis of the menstruating woman...but like I said, there's no actually proof behind this

Answer 3

Yes, my best friend and I used to have or periods at different times of the month ( when we didn't hang out much). But we have been hanging out almost everyday in the last 7 months, we are now on the exact same day. She starts like an hour before me every month. We actually talked about this yesterday, I don't know how this happened but I know it happened to us.

Answer 4

Yes, it is true. The really funny thing is, scientists didn't realize it happened in humans until 1971, when a college girl piped up at a conference about pheromones causing female mice to ovulate at the same time. They thought she was crazy. She wrote a paper on it and now it's fairly common knowledge. Her name is Martha McClintock.

Answer 5

As to an explanation, I have none but I have experienced this in sports. In volleyball and softball it becomes extremely obvious and not just because you had a bad game :) I feel bad for all of our coaches because they are all men. When our softball coaches got married and now both have kids they became a little more understanding...a little. But yeah, I've definitely noticed that.

Answer 6

i've heard this but it may only be urban legand. there really isnt any physical reason this should occur, and didnt ever happen to me.
on a side note, i work with about 20 girls and almost all of us start our periods within a few days of each other, but its not from it changing to the same time, im on bc so my period dates never change.

Answer 7

This does happen. Maybe a chain reaction when the PMS sets in? Every man I work with will tell you that on certain days of the month it isn't worth his life to hide the chocolate! We outnumber them!!

Answer 8

I have heard of this, but it never happened with me.
My mom, my sister and I always had ours had a different time of the month.
And my daughter and I also have ours a different week of the month. (too bad for my husband, he can't get all the PMS out of the house all at once, lol)

Answer 9

It is true. I have five roommates and within two months we all had our periods at the same time!

Answer 10

yes it is true. has happened from the first time getting period all the way thru adulthood working with other women in office.

Answer 11

Women are the biggest lying speices on the planet earth. You think they will tell you the truth? I dont think so. Especially, not to a man. You should forget about women telling you the truth on here