Anovulation often shows as irregular, very infrequent or absent periods. Common causes include polycystic ovary syndrome, thyroid disorders, raised prolactin, significant weight change and intense physical stress. It is frequently treatable.
Fertility Glossary
Anovulation
Cycles in which no egg is released.
Related terms
PCOS
Polycystic ovary syndrome, a common cause of irregular or absent ovulation.
Ovulation induction
Medication used to trigger the release of an egg where ovulation is irregular or absent.
Prolactin
A pituitary hormone which, if raised, can stop ovulation.
TSH (thyroid-stimulating hormone)
A blood test of thyroid function.