These are pains in your lower abdomen. You may feel them before and during your menstrual period. For most women, they're not serious. But for some, they can be very painful.
Dysmenorrhea happens when the uterus contracts very strongly, causing pain. This can occur on its own, or as the result of an underlying health problem.
Heavy menstrual bleeding means periods that are heavier or longer than normal. There are many possible causes of heavy menstrual bleeding.