Girls, is this true?

Dear girls, i wanna ask something.

Do you girls go through a lot of pain during periods? Because, i saw many times my girlfriend used to lock herself in a room for whole day for lot letting me know that in how much pain she is in.

But yesterday i saw her in periods and i was with her for whole day, and she was really in pain for whole day. And was bleeding randomly and frequently. As i was feeling so bad, like i had tears in my eyes.

I want to you express your experiences about your period times and how painful it is.
Girls, is this true?
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