Maybe it's because guys ask us why we're so pissy!!! LOLOL (just joking) It really is a hormones gone wild kinda thing. Hard to explain it... I can feel myself not being myself, but not until it's too late and I'm being pissy!!
yes and yes and more... Hormones make us have emotional swings, we also get horrible cramps, our bodies retain water which makes us bloated and uncomfortable and our clothes become tight and even shoes can pinch, many women get migraines at this time as well and we feel very tired all the time while mensturating. So we feel really cruddy and then ppl say stupid stuff to us like "are you on the rag" -.- the nastiness of dealing with the bleeding is actually minor compared to the rest.
It's hormones because some women have pms, which is before their period even starts, and then feel fine when it finally starts! Hormones are powerful and affect men too, but men don't have changing levels of hormones in a short space of time.
because of the chemicals/ hormones. but not all girls are p1ssy; im generally not, but it feels like a wicked flu-like stomach ache for me, almost like a punch in the lower stomach. if anyone is really jolly feeling that way, then, man, am I ENVIOUS... XD