A woman may fail to ovulate due to hormonal problems which are linked to malfunctions in the hypothalamus or pituitary gland or diminishing ovarian reserve as a result of ageing. In other cases, it is also linked to ovarian or gynaecological conditions such as polycystic ovarian syndrome (PCOS) or primary ovarian insufficiency (POI). Furthermore, scarred ovaries from previous surgeries, premature menopause, lifestyle, and environmental factors are also potential causes.