Menorrhagia is a condition that affects women and is characterized by having very heavy menstrual periods with prolonged bleeding. Menorrhagia is more severe than just having an abnormally heavy period once in a while because with menorrhagia, women experience a heavy loss of blood during every menstrual period. While it is concerning in general for premenopausal women to experience heavy blood loss, most premenopausal women do not experience such a heavy blood loss to be considered menorrhagia. It is estimated that about 10 percent of women in the United States have menorrhagia.