If you’ve never had a period, this cramping can’t be related to your menstrual cycle. It’s odd that it occurs monthly. It’s possibly related to a gastrointestinal problem or foods you eat. Or, says Dr. Masterson, emotions can upset your stomach.

Do you have a quiz the last week of every month? A solo rehearsal—anything that makes you anxious or upset? Often, emotional problems manifest themselves in physical ways—strange but true.

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