Introduction
Changes to periods are a common symptom during perimenopause, the transitional phase leading up to menopause. These changes occur due to hormonal fluctuations, primarily involving oestrogen and progesterone. As the ovaries gradually produce less oestrogen, the menstrual cycle becomes irregular. Ovulation may become inconsistent, leading to variations in cycle length, flow, and frequency. Once menopause is reached (defined as 12 consecutive months without a period), menstrual periods stop completely.
Hormonal imbalances can also affect the thickness of the uterine lining, causing heavier or lighter bleeding.