Definition: The period of transition to natural menopause during which the body undergoes endocrinologic and biologic changes resulting from declining ovarian hormone production; symptoms can include irregular menstrual periods, hot flashes, vaginal dryness, insomnia, and mood swings. Perimenopause can last over six years (four years is average) and usually ends after twelve months of amenorrhea.
Examples: When Anne started having night sweats she wondered if she was in perimenopause.
