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Menstrual irregularities are changes to the menstrual cycle that result in missed periods, irregular periods, or excessive bleeding. Menstruation (pronounced men-stroo-ey-shuhn) is normal discharge of blood and tissue … Menstruation (pronounced men-stroo-ey-shuhn) is normal discharge of blood and tissue from the uterine lining … Nichd participated in nih research to understand if and how covid-19 vaccinations affected menstruation. · what is menstruation? Learn more about the results of this research. · about menstruation what is menstruation? Nichd is one of many … · the following organizational units address issues related to menstruation and the causes and effects of menstrual irregularities: