The menopausal transition, which lasts for four years on average and often longer, is the slow decline of ovarian activity. While heavy menstrual bleeding or flooding is common during perimenopause, a severe episode—a "super soaker event"—with additional symptoms, such as dizziness, nausea, feeling faint or passing out, might require hospitalization.

Fluctuation in period frequency and blood volume is common during this transitional period, but these symptoms shouldn't be dismissed, according to Fiona Catchpowle, the founder of the Menopause School, an e-learning platform based in England.

"As the ovarian activity changes, so do patterns of the menstrual cycle," Catchpowle said. "The lifetime journey along the typical 'hormone highway' from periods to no periods is approximately 40 years. During the first 30 years, the infradian cycle we call menstruation is repeated approximately every 28 days."

However, regular menstruators experience a different kind of bleeding once or twice a year, called the anovulatory cycle, when the cycle has gone full