Menstrual cramps are pains in a woman's lower abdomen that occur when her menstrual period begins (or just before) and may continue for two to three days. They may be throbbing or aching and can be dull or sharp. Symptoms can range in severity from a mild annoyance to severe pain that interferes with normal activities. Menstrual cramps are the leading cause of absenteeism in women younger than 30. Although over half of women who have menstrual periods experience some discomfort, 10% are temporarily disabled by symptoms.