Dysmenorrhea is pain in the lower abdomen related to the menstrual cycle. It occurs 1-2 days before the onset of menstruation and/or during the first few days of menstruation. Dysmenorrhea can range from mild dull or cramping pain to severe pain such as lower back pain, nausea, vomiting, sweating, diarrhea or constipation, bloating, dizziness and headache.