Low Estrogen in Menopause: Symptoms and How Estrogen Decline Affects Your Body

When does estrogen start to decline?

For most of your reproductive years, estradiol from the ovaries rises and falls in a predictable monthly pattern. In your 40s, as the supply of follicles runs low, that pattern becomes erratic. The brain pushes harder with follicle-stimulating hormone (FSH), and some cycles produce a burst of estrogen while others produce very little.

That is why early perimenopause can feel like too much estrogen rather than too little. In a small but detailed study of daily urine samples, women over 47 who were still cycling had higher overall estrogen output and lower progesterone output than younger women (Santoro 1996). Heavier periods, breast tenderness and worse PMS are common in this phase.

The steep fall comes later. In the large SWAN study, average estradiol stayed fairly stable until about 2 years before the final menstrual period, dropped fastest around the final period, and settled at a low, stable level about 2 years afterward. FSH began rising around 6 years before the last period (Randolph 2011). Menopause itself is defined after 12 months without a period, which happens at an average age of about 51 in the US. For typical numbers at each stage, see estrogen levels by age.

By the numbers

The timing of estrogen decline (SWAN)

~6 yrsbefore the final period, FSH begins risingSource: Randolph 2011

~2 yrsbefore the final period, average estradiol stops holding steady and starts to fallSource: Randolph 2011

~2 yrsafter the final period, estradiol settles at a low, stable levelSource: Randolph 2011

What are the symptoms of low estrogen?

The well-known ones

• Cycle changes. Shorter or longer cycles, skipped periods, or heavier bleeding, often the first sign.
• Hot flashes and night sweats. Falling estrogen narrows the brain's temperature "comfort zone," so small changes trigger flushing and sweating (Bansal 2019). In SWAN, frequent hot flashes lasted a median of 7.4 years overall (Avis 2015).
• Vaginal dryness and painful sex. See below.

Signs beyond hot flashes

• Poor sleep, including waking at 3 a.m., with or without night sweats.
• Mood changes: irritability, anxiety, low mood, or a first episode of depression. Perimenopause is a higher-risk window for depression; see menopause and depression.
• Brain fog and forgetfulness. In SWAN, women in perimenopause did not show the usual improvement with repeated memory and processing-speed testing, but performance recovered after menopause (Greendale 2009).
• Joint aches and muscle stiffness.
• Urinary urgency, frequency or repeated UTIs.
• Dry, thinner skin and hair changes.
• Lower desire and arousal, often tied to dryness, sleep and mood as much as hormones.
• Palpitations, which are common but should always be checked by a clinician.

None of these is unique to estrogen. Thyroid disease, anemia, depression, sleep apnea and medications can mimic them, which is why a clinician's review matters. Our perimenopause symptoms guide covers the full list.

How does estrogen decline affect your body over time?

Bones

Estrogen slows the cells that break down bone. When it falls, bone turnover speeds up, and the years around the final period are the period of fastest loss. That is why menopause is a good time to talk about fracture risk and when to have a bone density scan (Office on Women's Health).

Heart and cholesterol

Most cardiovascular risk factors change gradually with age, but SWAN found total cholesterol, LDL cholesterol and apolipoprotein B rise distinctly in the year before and after the final period (Matthews 2009). This is a good time for a lipid check and a heart-risk review.

Weight and body shape

The scale may not change faster at menopause, but what's underneath does. In SWAN, the rate of fat gain doubled at the start of the transition while lean mass began to decline, continuing until about 2 years after the final period (Greendale 2019).

Vagina, vulva and bladder

Unlike hot flashes, which usually fade eventually, genitourinary syndrome of menopause (GSM) tends to persist or worsen without treatment. It includes dryness, burning, pain with sex, urgency and recurrent urinary infections (Menopause Society 2020). Learn more in genitourinary syndrome of menopause.

Can estrogen drop suddenly instead of gradually?

Yes. Removing both ovaries (bilateral oophorectomy) causes estrogen to fall within days rather than years, and symptoms are often more intense. Chemotherapy, pelvic radiation, and medicines that suppress the ovaries or block estrogen production can do the same. A hysterectomy that leaves the ovaries in place does not cause immediate menopause, though some studies suggest it may arrive a little earlier. Women who lose ovarian function before the usual age of menopause are generally advised to take hormone therapy at least until around 51 unless there is a reason not to, which is covered in estrogen after hysterectomy.

Is it low estrogen or something else?

Blood estradiol tests are rarely useful in perimenopause because a single reading can be high one week and low the next. For women over 45 with typical symptoms, clinicians usually diagnose perimenopause from your age, cycle changes and symptoms. Testing has a bigger role if you are under 40 to 45, have had a hysterectomy so you can't track periods, or have symptoms that don't fit. Symptoms before 40 can signal primary ovarian insufficiency, which needs prompt evaluation because it carries long-term bone and heart risks.

What can you do about low estrogen?

Lifestyle foundations

Resistance and weight-bearing exercise protect bone and muscle. Consistent sleep timing, a cool bedroom, limiting alcohol, not smoking, and enough protein, calcium and vitamin D all help. These don't replace estrogen, but they shape how you feel and your long-term health.

Nonhormonal treatments

For hot flashes, options include certain antidepressants (SSRIs/SNRIs), gabapentin, fezolinetant, and cognitive behavioral therapy. For vaginal symptoms, regular moisturizers and lubricants help many women.

Hormone therapy

Replacing estrogen is the most effective treatment for hot flashes and GSM, and it prevents bone loss. For women under 60 or within 10 years of menopause without contraindications, The Menopause Society considers the benefit-risk balance favorable (Menopause Society 2022). Women with a uterus need a progestogen alongside estrogen. Options include FDA-approved patches, gels and pills, low-dose vaginal estrogen for local symptoms, and compounded preparations. Our hormone replacement therapy guide compares them.

Amie's clinicians prescribe Amie HRT+, a compounded estradiol and progesterone cream whose strength a licensed clinician chooses after reviewing your health history. It is not FDA-approved, and it isn't right for everyone, including women with a history of breast cancer, blood clots or stroke. The clinician will tell you if another option or in-person care is a better fit.

The bottom line