The Signs of Perimenopause, and What to Expect

Learn the common signs of perimenopause, when they may start, and what can help you manage them.

When you’re young, perimenopause can seem worlds away — but it may start sooner than you expect. And when you finally edge into perimenopause (most commonly in the mid-40s), it’s not always easy to tell since the early signs of perimenopause aren’t all obvious. Things like insomnia, headaches, weight gain, and fatigue can be blamed on all sorts of other things (stress, diet, etc.) when they may be related to perimenopause. 

A 2026 study published in the journal Menopause even found that roughly one-third of the women surveyed (all aged 35+) were uncertain of which reproductive stage they were in — and that uncertainty peaked at 42 percent in the 40-44 age group, just a few years shy of the estimated median age of perimenopause onset in the United States. To clear things up, keep reading to understand the most common signs and symptoms of perimenopause, when to expect it, how it differs from menopause, and what you can do about all of it.    

TL;DR

The most common signs of perimenopause — the period leading up to menopause and your last menstrual period — are irregular periods, hot flashes and night sweats, sleep trouble, and mood changes, usually starting in the mid-40s. Still, the symptoms, onset age, and length of perimenopause vary from person to person. There are treatment options for managing symptoms; talk to your doctor about what’s right for you. 

Key Takeaways

• Perimenopause is the period leading up to menopause and the end of your menstrual periods; it typically starts in the mid-40s and lasts several years, though timing and length vary from person to person.
• Persistent changes to the length of your menstrual cycle are often one of the clearest early signs of perimenopause.
• Other common symptoms of perimenopause include hot flashes, sleep problems, mood changes, and brain fog. 
• Perimenopause is natural, but you don’t have to deal with symptoms alone; talk to your doctor about treatment options that can help.

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What Is Perimenopause?

Perimenopause is the transitional period leading up to menopause, according to the American College of Obstetrics and Gynecologists (ACOG). Menopause is the time in your life when you stop having menstrual periods, and is officially marked after one year of no periods. On average, perimenopause lasts about four years but it can vary widely, ranging from two years to eight years or more.

During perimenopause, levels of reproductive hormones (including estrogen and progesterone) fluctuate and begin to slowly decline. These hormonal shifts affect the whole body, including bone and skin health, digestion, mood and cognitive function, and can cause symptoms ranging from brain fog and fatigue to menstrual cycle changes. During this time, fertility declines and your ovaries stop releasing eggs as frequently — but it is still possible to become pregnant.

The Signs and Symptoms of Perimenopause

Some people have severe symptoms during perimenopause, while others might experience minor ones or no symptoms at all, according to ACOG. Symptoms can range from the more obvious (such as changes to your menstrual cycle or libido) to ones that you might not expect to be tied to perimenopause (such as headaches or trouble sleeping). 

Here are some of the most common perimenopause symptoms you might experience: 

• Menstrual cycle changes. Shifting hormones and irregular ovulation can cause changes to your menstrual cycle during perimenopause. Cycles may become longer or shorter than usual, your period may change in length or flow, and you may skip periods altogether, according to the Menopause Society.
• Hot flashes and night sweats. Hot flashes affect the majority of women during the menopause transition. They’re characterized by a sudden feeling of heat in the upper body, face, neck, and chest, and can last from a few seconds to several minutes. Night sweats are hot flashes that happen while you’re sleeping. With either, you might also have sweating, chills, anxiety, and a faster heart rate. 
• Sleep disturbances. Trouble falling and staying asleep are some of the most commonly reported symptoms during perimenopause. One 2026 meta-analysis of 102 studies found that insomnia was reported by about 27% of perimenopausal women, while other research estimates sleep problems affect around 40% of women in the transition, rising to roughly 45% in late perimenopause. Night sweats can also disrupt your night and then make it difficult to fall back asleep. 
• Vaginal and urinary tract changes. Declining estrogen levels can make vaginal tissue thinner, dryer, and less stretchy, which can cause pain during sex and also increase your risk of infections. Changes in urinary tract tissue can also lead to urinary symptoms and increase the risk of urinary tract infections (UTIs). 
• Headaches. Hormonal fluctuations can make headaches or migraine attacks worse or more frequent for some people during perimenopause, especially those who already have hormone-related migraines.
• Depression and mood changes. Hormonal shifts, sleep problems, and other midlife stresses can contribute to mood swings or more significant changes, such as depression and anxiety. The 2026 meta-analysis also found that about 32 percent of perimenopausal women had depressive symptoms and 29 percent had symptoms of anxiety. Some research suggests the risk of depression rises during perimenopause and remains elevated in the first few years after reaching menopause.
• Brain fog and fatigue. Fatigue is a commonly reported perimenopause symptom, and 40–60 percent of middle-aged women report cognitive symptoms such as brain fog or forgetfulness during the menopause transition, according to the Menopause Society. 
• Weight and body changes. Lower circulating estrogen levels can lead to weight gain during perimenopause and menopause and make it more difficult to lose or maintain your weight.

Jenna Congdon, RN, encourages people experiencing these types of symptoms. “When you’re not sleeping well or you’re dealing with persistent hot flashes, fatigue, or other symptoms, it affects so many areas of life and can take a toll on your overall well-being. It’s important to take those concerns seriously rather than just assuming they’re something you should ignore or just live with. If something feels off or interferes with daily life, try keeping track of your symptoms in a simple app or notebook, then bring it to your healthcare provider so that you can make a plan for managing them. 

Managing Perimenopause Symptoms

Perimenopause may be totally natural, but that doesn’t mean you can’t do anything about the symptoms. There are options, from medications to everyday habits, that may help reduce or manage symptoms so they interfere less with your life.

• Try lubricants or vaginal moisturizers. Use lubricants during sexual activity or vaginal moisturizers as needed to help with vaginal dryness. 
• Get enough exercise. Moderate-intensity aerobic exercise (aka cardio) may help improve sleep and mood symptoms, make it easier to manage your weight, and benefit your overall physical health. Yoga may also help with insomnia symptoms, according to one randomized controlled trial that included women in the menopausal transition. Strength training can help maintain strong bones, reduce the risk of osteoporosis, and counteract the bone loss that naturally happens with age and accelerates after menopause.
• Eat a balanced diet. A diet rich in fruits, vegetables, legumes, and whole grains, and including a higher proportion of healthy fats from fish, nuts, and seeds, can help support overall health and may help to control hot flashes and night sweats, though current evidence is limited. Also prioritize getting enough calcium and vitamin D to support bone health.
• Notice your triggers. If caffeine, spicy food, or alcohol seem to worsen your hot flashes or night sweats, try cutting back to see whether or not it helps. 
• Talk to your doctor. Hormone therapy, vaginal estrogen, hormonal birth control, and other medications (such as antidepressants) can help with specific perimenopause symptoms. Your doctor can help you decide what’s appropriate and safe for you. 

When to See a Doctor

Talk to your doctor if symptoms bother you, interfere with daily life, or begin before the age of 45. They can help confirm if the symptoms are caused by perimenopause or something else, and recommend potential treatments.  

ACOG specifically recommends speaking to your ob-gyn about any menstrual bleeding changes, including: bleeding or spotting between periods; bleeding or spotting after sex; heavy bleeding during your period; bleeding that is heavier or lasts for more days than usual; or any bleeding or spotting after menopause.

Frequently Asked Questions

Bottom Line on the Signs of Perimenopause

Every year, approximately 2 million women in the U.S. enter perimenopause. It’s a natural part of life, but it can catch you off-guard; the hormonal changes can be gradual and unpredictable, and symptoms show up differently for everyone. Still, it doesn’t mean you need to put up with bothersome symptoms. Talk to your doctor about any perimenopause symptoms you’re experiencing — there may be more tools to help than you think. 

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