Early perimenopause symptoms: the first signs at 40, 44 and 47

Perimenopause rarely announces itself with a hot flash. For most women it starts with small changes that are easy to put down to stress, a busy year or getting older. Recognizing the early signs helps you act on the parts you can influence, and spot the ones that need a doctor.

The first signs of perimenopause

ACOG describes the typical first sign as a change in your menstrual cycle: cycles may become longer or shorter, periods may be skipped, and flow can become lighter or heavier.¹ The international staging system for reproductive aging, STRAW+10, also uses changes in bleeding pattern to define the early stage of the transition.⁶

Heavier periods surprise many women, who expect periods to fade away. In early perimenopause they can do the opposite.

Perimenopause symptoms by age

At 40

Estrogen can start to fluctuate in your late 30s and 40s, so perimenopause at 40 is possible.¹ But cycle changes at this age can also come from thyroid problems, other hormone conditions, stress or medication. NICE suggests an FSH blood test may be considered to help confirm menopause at 40 to 45 in women with symptoms and cycle changes.² At 40, a visit to your doctor is the right first step rather than a self-diagnosis.

At 44

Changes in your cycle and sleep at 44 are very often the start of perimenopause. In the Massachusetts Women's Health Study, perimenopause began at a median age of 47.5, which means half of women started earlier.³ Menopause before 45 is called early menopause, so if your periods stop altogether at this age, see your doctor.

At 47

At 47 most women are in or close to perimenopause. From 45, NICE says perimenopause can be identified in otherwise healthy women from recently started hot flashes or sweats plus any change in the menstrual cycle, without lab tests.² Is there a test for perimenopause explains why blood tests are rarely useful.

Why early hot flashes matter

If hot flashes or night sweats start early, they tend to last. In the SWAN study, women whose frequent hot flashes began before or early in perimenopause had them for a median of over 11.8 years in total, much longer than women whose flashes started after the final period.⁴ If they are already bothering you, it is worth discussing treatment rather than waiting for them to pass. Hot flashes covers the options.

The early change you cannot feel

In the SWAN study, lean mass began to fall and fat gain sped up during the transition.⁵ That starts well before most women think of themselves as menopausal, which is why the early forties are the best time to protect muscle, not the late fifties.

Two habits do most of the work: strength training two or three times a week, and protein at every meal. The Dietary Guidelines for Americans 2025 to 2030 set a goal of 1.2 to 1.6 g of protein per kilogram of body weight a day and tell adults to prioritize protein at every meal.⁷ Breakfast is where most women fall short.

Protein Buddy works out a daily target from a short quiz on your weight, age, activity and goal, and Home shows how many grams are left today as you log. Typing meals in by hand is free with no limit, and how to track protein in perimenopause walks through the per-meal numbers. Strength training for women over 50 has a simple plan that works just as well at 42.

If you are wondering whether you still ovulate, see ovulation in perimenopause.

When to see a doctor

See a doctor about any of these, whatever your age:

• Very heavy bleeding, or bleeding that lasts much longer than usual.
• Bleeding between periods or after sex.
• Periods that stop or become very irregular before 45.
• Low mood or anxiety that is new or getting worse.
• Symptoms that stop you sleeping or working.

For irritability specifically, see perimenopause rage. For the complete picture of symptoms, see perimenopause symptoms, and for timing, perimenopause age.