It is necessary to consult a gynaecologist
under the following conditions:
even after 2 years of starting your periods, they continue to be irregular and unpredictable
menstrual flow which is very heavy or lasts much longer than your normal number of days
severe discomfort, stomach cramps
after starting menstruation, your period stops occurring for several months
if you do not start menstruating until the age of 17
bleeding of the vagina in between 2 periods.