Ovarian insufficiency or ovarian failure is the condition suffered by young women, under 42 years, with malfunction of the ovary due to low ovarian reserve.
All women lose proper ovarian function at some point in their lives, since the ovary is endowed with follicles (which inside have eggs) that are going to decrease throughout our lives, and are not going to regenerate again.
If exhaustion comes at 48 years, it is not a problem, and menopause occurs naturally.
However, in other women, there may be ovarian depletion at a young age. If it is accompanied by alterations in the pattern of the menstruational cycles, an early ovarian failure will occur. If, on the other hand, there are no alterations in the menstrual pattern, it will be called occult ovarian failure.