This document discusses menstrual irregularities, which are common abnormalities of a woman's menstrual cycle where menstruation is irregular, heavy, painful, or absent. It defines common types of irregularities like amenorrhea, dysmenorrhea, oligomenorrhea, and polymenorrhea. Potential causes include hormonal imbalances, medical conditions, stress, obesity, age, and cancer. Treatment may involve lifestyle changes, herbal supplements, drugs, surgery, or management by a healthcare provider depending on the underlying cause.