What's the difference between perimenopause and menopause?

Perimenopause means "around the menopause" and is the first of three phases that completes the menopause transition. Perimenopause mimics puberty with irregular menstrual periods, mood swings, irritability, fuzzy thinking, and occasional hot flashes. Menopause is the second phase and requires twelve months of no periods or spotting to complete this phase. Hot flashes, night sweats, mood swings, decreased libido, and vaginal dryness are the hallmark symptoms of this phase.