# anovulation common in perimenopause > Ovulation disturbances are also extremely common in perimenopause. In perimenopause the coordinated system is falling apart. At this time, the ovary’s primary goal is to “get rid of” any remaining estrogen producing cells to avoid a rogue period at 80.[[(Prior, 2014)#^68y8k]] > Anovulatory cycles occur at increased frequency in the last 30 months before final menses or menopause.[[(Burger et al., 2008)#^whttk]]