The transition period before menopause, typically occurring in women in their 40s, marked by hormonal fluctuations and symptoms like hot flashes, irregular periods, and mood changes. This phase can last anywhere from 4 to 10 years, with the average duration being around 4 years. Perimenopause ends when a woman has gone 12 consecutive months without a period, signaling the start of menopause. (Source: NHS)
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