Women’s hormones: find your starting point

The transition in four steps

1. Reproductive years: cycles may be regular or irregular for many reasons. Symptoms need their own assessment rather than being automatically attributed to hormones.
2. Perimenopause: cycle length and flow often change; hot flashes, sleep problems, mood or concentration changes, and vaginal dryness can occur. Pregnancy remains possible.
3. Menopause: one final menstrual period marks menopause, confirmed only after 12 months with no period and no other explanation.
4. Postmenopause: hot flashes may persist, and vaginal or urinary symptoms can appear or worsen. Bone and cardiovascular prevention become important parts of routine care.

Hormonal contraception, hysterectomy, ovarian surgery, chemotherapy, and radiation can make this timeline look different. Perimenopause vs. menopause handles those exceptions side by side.

What estrogen and progesterone do

Estrogen helps build the uterine lining during a menstrual cycle and supports bone, vaginal and urinary tissue, and temperature regulation. Levels change throughout each cycle and fluctuate substantially during perimenopause.

Progesterone rises after ovulation and helps prepare the uterine lining for pregnancy. When ovulation becomes less regular in perimenopause, progesterone exposure also becomes less predictable, contributing to changing bleeding patterns.

Your usual cycle pattern provides context for changes in sleep, temperature, mood, or bleeding. Record what changed and when. If you are unsure where to start, the hormone imbalance symptoms quiz can organize concerns beyond menopause. It does not identify a diagnosis.

How blood tests can help

Blood tests can add useful measurements to your symptom history. FSH and estradiol help assess ovarian function when the timing or cause of changes is unclear. A TSH test checks thyroid function, while a CBC can identify anemia.

A hormone panel groups several measurements when a broader review fits your needs. Use the menopause testing guide to compare individual tests and plan the collection. If you already use HRT, see the separate HRT blood-work and monitoring article.

When age changes the decision

Natural menopause commonly occurs between 45 and 55, with a U.S. average around 51. Periods stopping from 40 through 44 is early menopause. Before 40, clinicians assess for POI and other causes of absent periods.

Earlier loss of ovarian function deserves prompt assessment because fertility, pregnancy prevention, bone health, cardiovascular health, and hormone treatment may all require decisions. Read what early menopause means before 45.

Treatment starts with your priority

Systemic hormone therapy is the most effective treatment for bothersome hot flashes and night sweats. Local vaginal therapies treat vaginal and urinary tissue symptoms. Nonhormone prescription treatments, CBT-I for chronic insomnia, pelvic-floor therapy, and standard treatment for mood, sleep, thyroid, or metabolic conditions may fit other patterns.

No treatment is required merely because menopause occurred. Treatment is reasonable when symptoms matter to you or when a condition such as POI changes long-term health planning. See menopause treatment options by symptom.

Organize your symptoms before a visit

The perimenopause symptoms quiz can help when your cycles are changing. Use the menopause symptoms quiz to sort concerns later in the transition. Bring the patterns, your main priority, and any test results to a clinician. These self-assessments do not diagnose a stage.