It often hits the cervix because of it's placement. The cervix is very sensitive. The pressure and dryness of the tampon can cause pain. Pain can cause dizziness.

edit: actually it doesn't even need to hit the cervix to be painful, just an object being in a place that isn't used objects being there can be enough.

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Quite a few things. If it isn't deep enough it hurts the outside, if it's too deep it can hurt the inside. For a lot of women there are only so many angles that will allow it to go in enough. But just because it's in doesn't mean it's comfortable, sometimes it's just not for no reason or perhaps the angle or deepness again.

On top of that they can be pretty drying, that can be painful too. And some women will just get pain from cups and tampons either all the time or sometimes. It probably has to do with the cramps/sensitively that are being amplified by the foreign object.

I get that from time to time, sometimes when inserted, sometimes hours later. Pain washes over me followed by nausea. Eject the tampon, lie down and suddenly it's all good. If I am too late i may barf or cry. Or both. Probably both.

But its rare so I still dabble with tampons. No more cups tho, cant take them out all the time or fast enough.

Bro asking the questions bros have. I’m firmly convinced that if men had to deal with periods, childbirth and the rest - our branch of evolution would have died off hundreds of thousands of years ago.

Why don't you ask your family?