Premature Ovarian Failure
![Premature Ovarian Failure](/files/cache/be4be5ccbbe7ced185f6195d96dc981e.jpg)
Premature ovarian failure (POF) is usually defined as menopause under the age of 40 and occurs in about 1% of women. Before periods totally cease there is often a length of time when periods are irregular or when the follicle stimulating hormone (FSH) is raised to around 15 to 20 IU.