An irregular menstrual cycle, caused by hormonal imbalances, affects fertility amongst women. As eggs are not produced regularly on account of irregular ovulation, planning a pregnancy is not possible. However, for the most part, cases of irregular menstrual cycles are treatable.

Polycystic Ovaries (PCO) and Polycystic Ovary Syndrome (PCOS) and a sudden significant weight loss or weight gain in a short period of time, hormonal imbalance and co-existing medical problems, such as thyroid disease or diabetes can cause irregular menstrual cycles.