Stomach Cramps Condition_symptoms How Come I Never Get Stomach Cramps During My Periods?

How come I never get stomach cramps during my periods? - stomach cramps condition_symptoms

Many people I know have a bad stomach ache very badly when their rules, but I've never stomach cramps. Sometimes I have a slight pain, but left after a while. Why did you give me stomach cramps, but the others? (Including my mother)