Perimenopause 101: What's actually happening to your body (and what to do about it)

If you're in your late 30s or 40s and something feels... off — your periods are all over the place, you're not sleeping like you used to, your mood has a mind of its own, or you walked into a room and forgot why — you're not imagining things. You might be in perimenopause.

Perimenopause is the transition phase leading up to menopause, and it can start much earlier than most people realize. Let's break down what's actually going on, what's normal, and what you can do about it.

What is perimenopause, exactly?

Perimenopause literally means "around menopause." It's the stretch of time when your ovaries gradually produce less estrogen and progesterone, leading to hormonal fluctuations that can affect nearly every system in your body. You're not "in menopause" yet — that's officially defined as going 12 consecutive months without a period. Perimenopause is the rocky road getting there.

Most people think of menopause as something that happens in your 50s. And the average age of menopause is 51. But perimenopause? That often starts in your early-to-mid 40s, and for some people, it can begin as early as the late 30s. The transition typically lasts 4 to 8 years, though it varies widely.

The most common symptoms

Perimenopause looks different for everyone, but here are the symptoms that come up again and again:

• •Irregular periods: This is usually the first sign. Your cycles may get shorter, longer, heavier, lighter, or just plain unpredictable. You might skip months entirely, then have two periods close together.

• •Hot flashes and night sweats: That sudden wave of heat that starts in your chest and rises to your face? Up to 80% of people in perimenopause experience hot flashes. Night sweats — their nocturnal cousin — can drench your sheets and wreck your sleep.

• •Sleep disruption: Even without night sweats, declining progesterone (your body's natural calming hormone) can make it harder to fall asleep and stay asleep. This is one of the most frustrating and under-discussed symptoms.

• •Mood changes: Anxiety, irritability, low mood, and emotional reactivity are incredibly common. Estrogen influences serotonin and other neurotransmitters, so when it fluctuates, your mood can too. If you've never experienced anxiety before and suddenly it's your constant companion, hormones may be playing a role.

• •Brain fog: Difficulty concentrating, word-finding problems, and feeling like your memory isn't what it used to be. This is real, it's documented in research, and for most people, it does improve after the transition.

• •Other changes: Vaginal dryness, decreased libido, joint aches, headaches, weight gain (especially around the midsection), and changes in skin and hair are all part of the picture.

The stages of perimenopause

Researchers break the menopausal transition into stages using the STRAW+10 framework:

• •Early perimenopause: Cycles become less predictable. You might notice a difference of 7+ days in cycle length compared to your norm. Hormone levels start fluctuating but periods still come.

• •Late perimenopause: You start skipping periods — going 60 days or more between cycles. Symptoms tend to intensify during this phase. Hot flashes become more frequent.

• •Menopause: Reached after 12 consecutive months without a period. The average age is 51, but anywhere from 45 to 55 is considered normal.

• •Postmenopause: Everything after that 12-month mark. Some symptoms improve, others (like vaginal dryness and bone density changes) may continue or emerge.

When to see your healthcare provider

Talk to your doctor or a menopause-informed provider if:

• •Your periods are changing and you want to understand why
• •Symptoms are affecting your quality of life, sleep, work, or relationships
• •You're experiencing heavy bleeding, very frequent periods, or bleeding after sex
• •You're under 40 and noticing these changes (this could indicate premature ovarian insufficiency, which needs evaluation)
• •You want to discuss treatment options like hormone therapy or other interventions

One important note: there's no single blood test that "confirms" perimenopause. Hormone levels fluctuate so much during this phase that a snapshot in time is often unreliable. Most experienced providers diagnose perimenopause based on your symptoms, age, and menstrual history.

What you can do right now

You don't have to just tough it out. Here are some starting points:

• •Track your symptoms: Start logging your periods, hot flashes, sleep quality, and mood. Patterns become much clearer over time, and this data is incredibly useful when talking to your provider. Lea can help you track these symptoms daily and spot trends you might miss on your own.

• •Prioritize sleep: This is foundational. Good sleep hygiene, a cool bedroom, and addressing night sweats can improve almost everything else. If sleep problems persist, talk to your provider about options.

• •Move your body: Regular exercise — especially strength training and moderate cardio — may help with mood, sleep, weight management, and bone health during this transition.

• •Eat well: Focus on protein (aim for 25-30g per meal), calcium-rich foods, and anti-inflammatory choices. Limit alcohol, which can worsen hot flashes and sleep disruption.

• •Talk about it: Perimenopause can feel isolating, especially if no one around you is discussing it. Find a community, tell your partner, talk to friends. You're not alone — roughly 1.3 million people enter menopause each year in the US alone.

• •Explore treatment options: From hormone replacement therapy (HRT) to non-hormonal medications to supplements, there are evidence-based options that can help. We cover these in detail in our other menopause articles.

The bottom line

Perimenopause is a normal biological transition, not a disease — but that doesn't mean you have to suffer through it without support. Understanding what's happening is the first step. The second is finding the right tools, treatments, and people to help you navigate it.

You deserve to feel like yourself. And with the right approach, most people find that they can manage this transition well and come out the other side feeling strong.

*This article is for educational purposes only and does not constitute medical advice. Always consult your healthcare provider before starting any new treatment or supplement.*