Hi

During puberty after menarche (first menstrual period), it is very common to have irregular anovulatory (not ovulating) cycles. This is one of the most common reasons for the delayed period. There are of course other causes like pregnancy, polycystic ovarian syndrome, overweight/underweight and so on. If the problem gets worse, it’s worthwhile to see a gynaecologist.

Thanks and regards,

Dr Ong Yeu Theng Charas