Updated August 2026 · The Bloom Phase Editorial Team
What is perimenopause?
Perimenopause is the transition leading up to menopause — the point when you have gone twelve months without a period. It usually starts in your 40s and lasts a few years to a decade. Estrogen does not simply fall; it swings unpredictably, and those swings drive most symptoms. You can be perimenopausal while still having periods.
The physical symptoms
- Hot flashes and night sweats — sudden heat, often at night.
- Heart palpitations — flutters and racing, often at 3 a.m.
- Weight gain — especially around the middle.
- Bloating — the stubborn kind, unrelated to food.
- Headaches and migraines — often tracking your cycle.
- Muscle and joint pain — new aches without an injury.
The sleep and energy symptoms
Insomnia and broken sleep, daytime fatigue, low energy that rest does not fix. These feed the others. If you fix one thing in perimenopause, sleep is the highest-value target.
The mood and cognitive symptoms
- Brain fog — losing words, forgetting why you walked in.
- Mood changes — irritability, anxiety, low mood.
These are real and hormonal, and for most women not permanent.
The cycle changes
Periods closer together or further apart, heavier or lighter, sometimes skipping months. Heavy bleeding is worth flagging — it is the main cause of the low iron that leaves so many women exhausted. See perimenopause and iron.
What helps across the board
Protecting sleep, strength training, managing stress, and — where a nutrient is genuinely low — targeted supplements. See our supplements guide. If you want to see your own pattern in one place first, work through the perimenopause symptoms checklist and take it to your next appointment.
FAQ
What are the first signs of perimenopause?
Often changes in your cycle and sleep, sometimes new mood shifts or the first hot flashes — while you are still having periods.
How long does perimenopause last?
Typically four to eight years, but it ranges from a couple of years to over a decade.
Can you have symptoms with regular periods?
Yes. Symptoms can start well before your cycle becomes irregular.
References
The health claims on this page are drawn from the following primary and institutional sources.
- What Is Menopause? National Institute on Aging (NIH). nia.nih.gov
- Perimenopause — Symptoms and causes. Mayo Clinic. mayoclinic.org
- Menopause symptoms and relief. Office on Women's Health, U.S. Dept. of Health & Human Services. womenshealth.gov