Anovulation and fertility

During a normal menstrual cycle, the egg matures and is released into the uterus, but this is not the case in anovulation - making it impossible for the woman to become pregnant. There are many causes of anovulation, but the most common ones include an unhealthy lifestyle, hormonal imbalance, malnutrition/excess weight, thyroid disorders, polycystic ovary syndrome, or advanced age. It is quite natural for women to not ovulate in about 25% of menstrual cycles.