Girls, Would you call period pain sick leave?

Most of this year my period has fortunately come in the weekend so I've had the weekend to recover from bad period pain.

Unfortunately this time it's come on a work day & need to take the day off as I can barely move.

Is this ok to say to my boss:

Unfortunately I can't come in today as I'm not feeling well.

Do I need to. give a reason or is that ok?

Girls, Would you call period pain sick leave?
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