Perimenopause is the transition years before menopause when hormone levels start to fluctuate.
What happens during perimenopause
Perimenopause is the transition phase that often starts in the 40s, although the timing varies from person to person and some experience it earlier. During this phase, estrogen and progesterone production becomes unstable, and cycles grow irregular before they finally stop at menopause. These hormonal swings can bring symptoms such as hot flushes, sleep disruption, and mood changes. The gap between periods may also become longer or shorter than usual. The phase can last several years, and it formally ends once a person has gone a full year without a period. After that point, a person is considered to have reached menopause. The hormonal background is explained further on the hormones page.
Why it matters for women with PCOS
For women with PCOS, this phase can be confusing because many symptoms overlap with PCOS. Irregular cycles, weight changes, sleep disruption, and mood shifts can stem from PCOS, perimenopause, or both at the same time. That makes it hard to tell the real cause apart without a doctor’s assessment. Someone who has long lived with irregular cycles may not notice when perimenopause begins. A basic overview of the condition is on the what is PCOS page.
Does PCOS change after menopause
Some PCOS symptoms such as irregular cycles may settle as menopause approaches, since periods eventually stop. However, this does not mean PCOS disappears entirely. Metabolic risks like insulin resistance and cardiovascular concerns often persist even after menopause, and may need more attention with age. Androgen-related signs such as skin or hair changes may also not fully disappear. That is why long-term health monitoring still matters, and you can read more on the insulin resistance page.
When to talk to a doctor
If you notice new symptoms or cycle changes during this stage of life, a doctor can help assess whether they relate to PCOS, perimenopause, or other factors. This assessment matters because some symptoms call for a different approach, and what suited you at a younger age may need to be reviewed later. Any decision about monitoring or treatment should be discussed with a doctor or pharmacist who knows your health history.
This glossary is education, not diagnosis. For your own situation, ask a doctor or pharmacist.