I’m not sure if by privates you mean the outside or the inside. It is common to have a sense of pressure and crampy pain in the area down there around the time of your period but I’m not sure I’d call it ‘hurting really bad.’ Privates aren’t supposed to hurt really bad. Ever. Make an appointment with your healthcare provider to help you figure out why you are in so much pain.
A lot of girls get cramps before their period starts. Usually, cramps are felt more in the abdomen (belly) area, but it's possible that you're just experiencing cramps further down. I used to have very painful cramps and I would feel them mostly in my lower stomach. You might want to talk to a trusted female relative (such as your mom, an aunt or an older sister) and ask them how their cramps feel and where they hurt and share how you're feeling. Then, after your period starts, pay attention each time you have it. You may even want to keep some notes in a journal. You might notice a pattern and that would give you some information to bring to your healthcare provider. If the pain is interfering with your life, you should make an appointment to see him or her. Also, be sure to read Dr. Molly's answer — she may have more ideas on what the pain could be.
Not only do our vaginas bleed, sometimes they're sore before they do. A couple of days before and sometimes into your period, some girls feel soreness "down there". I have it too. If it feels like someone punched you in the crotch repeatedly, then that's the soreness I'm talking about. Seriously, guys say that we don't know what it feels like to hurt "down there,” that we can't empathize, well, we can. That being said, you should talk to your healthcare professional about it. It may just be cramps, but it shouldn’t be unbearable.
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