Put a name on that cramp.Put a name on that cramp.Primary DysmenorrheaThese are common and happen during the first 3 days of your periods (and 1 day before). You feel them in the lower abdomen, back, or thighs and they can be mild to severe. They might also come with nausea and vomiting as well as fatigue and diarrhea.Secondary DysmenorrheaIf you notice the same symptoms as primary dysmenorrhea but for a longer PERIOD of time, minus the diarrhea, vomiting, fatigue, and nausea, you should go see a doctor. Secondary dysmenorrhea usually means that there is a disorder in the reproductive organs such as endometriosis, adenomyosis, infection or uterine fibroids.