During which stage are Vasomotor Symptoms (VMS) more likely to occur?

Vasomotor Symptoms (VMS), which include hot flashes and night sweats, are known to be particularly prevalent during the perimenopausal stage, often referred to as Stage 1b in menopause classification. This stage is characterized by hormonal fluctuations, primarily involving estrogen levels. These fluctuations can trigger the hypothalamic thermoregulatory center, leading to the common VMS experienced by many women.

The increased occurrence of VMS in this stage can often be attributed to the body's response to dwindling estrogen levels and the body's attempt to adjust to the impending transition to menopause. As women approach menopause, the variability in hormone levels becomes more pronounced, leading to a higher likelihood of experiencing symptoms like hot flashes.

In contrast, while VMS can still be experienced in other stages, especially during the transition to menopause and the postmenopausal phase, the intensity and frequency are generally heightened during perimenopause, making this stage the most critical for the onset of VMS. This understanding highlights why Stage 1b is noted for a surge in vasomotor symptoms during the menopausal transition.