Irregular menstruation, what symptom is this, menstruation is normal

Irregular menstruation refers to women's menstrual cramps without regular cycles, excessive menstrual blood volume during menstruation, excessive menstrual period is too short and too long irregular menstruation, normal menstruation is a regular cycle, generally 21~35 days, menstrual period is 2~8 days, a total amount of menstrual blood in 20ml~60ml.