Perimenopause Basics
Perimenopause can start in your late 30s and last a decade. Start here to understand the stages, the signs, and what's coming.
Last reviewed 2026-07-15 · Educational only. Not medical advice.
Guides
Sleep in perimenopause: what changes and why
Why perimenopause sleep fragments, the 3am wake pattern, and the environment and habit levers that consistently help.
Hot flashes, explained
The thermoneutral-zone theory of hot flashes, what triggers them, and what commonly reduces frequency.
Brain fog: what we actually know
Cognitive changes in the transition are real, measurable, and for most women, temporary. Here's what the research supports.
Menopause at work: a practical guide
Environmental fixes, communication scripts, and boundary-setting for the workplace during the transition.
Hormones 101: educational physiology
What estrogen, progesterone, FSH, LH, and testosterone actually do, and how their patterns shift in the transition.
The stages of the menopausal transition, explained
Perimenopause, menopause, and postmenopause defined — and the more granular STRAW+10 stages clinicians use.
Bone health basics for the transition
Bone density falls faster in the years around menopause. Here's why, and the everyday levers that matter.
Heart health basics for midlife women
Cardiovascular risk rises after menopause. Here's a plain-English tour of why, and what consistently helps.
Is this normal?
Is brain fog normal in perimenopause?
Yes. Cognitive changes — word-finding pauses, walking-into-rooms-forgetting-why, harder multitasking — are among the most commonly reported …
Why am I waking up at 3am every night?
Yes — mid-night waking, especially between 2 and 4am, is one of the most commonly reported perimenopause sleep patterns. It's often tied to …
Are heart palpitations normal in perimenopause?
Palpitations — a racing, pounding, or fluttering sensation — are commonly reported during the menopausal transition and often accompany vaso…
Are irregular periods in my 40s normal?
Yes — cycle changes are typically the first sign of perimenopause and often begin in the early-to-mid 40s. Cycles may shorten, lengthen, ski…
Are night sweats normal in perimenopause?
Yes — night sweats are a nocturnal form of vasomotor symptoms and affect the majority of women in the menopausal transition. They can range …
Are mood swings normal in perimenopause?
Yes — mood changes, irritability, and emotional volatility are commonly reported during the menopausal transition, especially in women with …
Are joint stiffness and frozen shoulder normal in perimenopause?
Yes — joint stiffness, achiness (especially in the morning), and 'musculoskeletal syndrome of menopause' are increasingly recognized. Frozen…
Is itchy skin normal in perimenopause?
Yes — pruritus (itchiness), skin dryness, and formication (a crawling sensation) are commonly reported during the menopausal transition. Est…
Support pathways
Menopause Brain Fog: What's Happening and How Dot Helps You Navigate It
Menopause brain fog is the word-finding difficulty, forgetfulness, and slower processing many people notice in perimenopause. It's driven by…
Mood Changes in Perimenopause: You're Not Imagining It
Mood changes in perimenopause — irritability, low mood, tearfulness, feeling flat — are real and driven by fluctuating estrogen and progeste…
Feeling Overwhelmed in Midlife: Understanding the Hormone Connection
Anxiety and overwhelm in perimenopause are common and biologically grounded. Estrogen and progesterone influence GABA and serotonin — the br…
How to Talk to Your Doctor About Menopause (and Actually Be Heard)
Prepare: track two weeks of symptoms, list your top three concerns, note your family history. Open with a specific sentence: 'I think I'm in…
Menopause Fatigue: Why You're Exhausted and How Dot Helps
Menopause fatigue stacks: fragmented sleep from vasomotor symptoms, hormonal effects on energy metabolism, and possible iron loss from heavi…
Menopause Heart Flutters: Educational Guide & Safety Framing
Palpitations are commonly reported in perimenopause, often tied to hormone dips and vasomotor episodes. However, women's cardiac symptoms ar…
Key terms
Perimenopause
The transition years leading up to menopause.
Menopause
The point 12 consecutive months after the final period.
Vasomotor symptoms (VMS)
Hot flashes and night sweats.
Night sweat
A hot flash occurring during sleep.
Estradiol
The primary estrogen produced by the ovaries.
Progesterone
A hormone that supports the second half of the cycle.
FSH (Follicle Stimulating Hormone)
A pituitary hormone that rises in the transition.
LH (Luteinizing Hormone)
A pituitary hormone tied to ovulation.
Common questions
How long does perimenopause last?
The perimenopausal transition averages four years but can range widely — from a few months to more than a decade.
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Dot is an educational AI companion, not a medical provider. For symptoms that are severe, sudden, or worsening, please consult a qualified clinician.