What is happening to my body?

This guide is designed to help you decode what’s common, what’s not, and when concerning symptoms should prompt a visit to your healthcare provider. Dr. Morse will also discuss what you can do about it — with real, science-backed answers.

Inside, you’ll learn the early signs of hormonal change, how to interpret your symptoms, which labs to request, and how to advocate for the care you deserve.

Because your body shouldn’t feel like a mystery — and you deserve the right support for what you’re going through.

What is perimenopause?

Perimenopause is the transition in the reproductive system leading up to menopause. Menopause is defined as 12 months without any uterine bleeding, but that definition was chosen for consistency, not because there is anything magical that happens after 12 months that doesn’t happen before. For many women, the changes in their hormones, brain, bones, heart and many other organs start much earlier than the “official” start of menopause.

The average time between the beginning of hot flashes and reaching menopause is seven years.

You might still get a period — sometimes more often, sometimes not at all, sometimes heavy, sometimes light — but feel totally unlike yourself: one week you’re fine, the next you’re weepy, wired at 3 AM, or too tired to function normally during the day.

So perimenopause commonly begins in the 40s with symptoms that may be the earliest signs of the menopause transition — and yet most women are never taught how to recognize them.

Here are 10 signs to watch for, so you can connect the dots and start addressing what your body is going through.

10 signs of perimenopause

1. Irregular periods or heavier/lighter flowYour menstrual cycles may become unpredictable, shorter, longer, or fluctuate between heavier and lighter flow. This is due to declining estrogen and progesterone levels affecting the menstrual cycle.
2. Mood swings or irritabilityYou might notice sudden, intense emotional shifts or find yourself increasingly irritated by things that previously didn’t bother you. These emotional changes result from fluctuating levels of estrogen and progesterone, influencing neurotransmitter balance.
3. Brain fog or trouble concentratingIt could become challenging to stay focused, clearly articulate thoughts, or remember details, giving you a foggy or disconnected feeling. Lower estrogen levels can impact cognitive functions, affecting clarity and memory.
4. Sleep disturbances, especially early morning wake-upsYou may regularly wake up around the same early hour — 3 AM is common — and find it hard to fall back asleep, leading to ongoing tiredness. Reduced progesterone levels disrupt sleep regulation and quality.
5. Weight gain, especially around the midsectionYou might notice increased fat accumulation around your belly, even if your diet and exercise routines remain consistent. Hormonal changes increase insulin resistance, leading to abdominal fat storage.
6. Hot flashes or night sweatsYou may experience sudden sensations of intense heat accompanied by sweating, flushed skin, or a racing heartbeat, especially at night. This occurs due to fluctuations in estrogen disrupting the body’s internal thermostat.
7. Fatigue that doesn’t improve with restFeeling persistently exhausted or drained, despite getting adequate sleep and rest. Hormonal imbalances can negatively impact energy production and metabolism.
8. Decreased libido or painful sexYou might experience a noticeable reduction in sexual desire, difficulty becoming aroused, or pain and discomfort during sexual activity. Declining testosterone and estrogen levels reduce sexual desire and vaginal lubrication, causing discomfort.
9. Increased anxiety or depressive episodesYou could find yourself experiencing heightened worry, feelings of sadness, or emotional sensitivity more frequently or intensely than usual. Hormone fluctuations, especially declining estrogen, can heighten stress responses and mood disturbances.
10. Breast tenderness or new PMS patternsYour breasts may become painfully sensitive to touch, or you might experience sharp, electric-like sensations. PMS symptoms may also become more intense or unpredictable. Changing estrogen levels increase breast tissue sensitivity and alter PMS patterns.

What’s common, and what’s not

Hormones explained

Hormones are the body’s messengers — every organ system in your body is influenced by hormones, including the gut, thyroid, liver, brain and reproductive system. Reproductive hormones don’t only affect the ovaries, uterus and vagina. They can have big impacts on mood, sleep, metabolism, libido, and memory.

During midlife, estrogen and progesterone begin to fluctuate widely — this is perimenopause — and eventually decline. These shifts don’t just affect your period. They ripple through your brain, heart, bones, and metabolism.

Understanding what each hormone does, and what happens when it’s out of balance, is the first step in making sense of your symptoms — and finding the right support.

Meet your key hormones

• Estrogen. Regulates menstrual cycles, supports mood, memory, skin elasticity, and bone health.
• Progesterone. Balances estrogen, promotes calmness, supports sleep quality, and regulates the uterine lining by preparing it for pregnancy.
• Testosterone. Boosts libido, supports energy, motivation, and muscle mass.

Signs of imbalance

• Low estrogen. Hot flashes, night sweats, brain fog, mood swings, and vaginal dryness.
• Low progesterone. Anxiety, difficulty sleeping, short cycles, spotting before your period.
• Low testosterone. Low libido, reduced muscle resilience, low mood, and persistent fatigue.

Starting support during perimenopause can improve outcomes and quality of life. The earlier hormone imbalances are addressed, the better the support for long-term brain, bone, and cardiovascular health.

Hormone therapy 101

• Considered safe for most women under 60, or within 10 years of menopause.
• Options include FDA-approved forms of native estrogen and progesterone, and synthetic hormones.
• Hormone therapy, commonly known as HRT, must be personalized to best treat your symptoms, minimize risks based on your medical and genetic history, and prioritize your unique goals.

Midlife healthspan checklist

Midlife is more than hot flashes and changing cycles — it’s a pivotal window for protecting long-term health. As hormones shift, they don’t just impact periods. They influence brain, heart, bones, and metabolism. That’s why this decade is the ideal time to get proactive.

Because helping you feel good now is just the beginning — the goal is thriving for decades to come.

Hormonal shifts impact more than periods

• Brain. Hormonal decline can affect memory, concentration, and mood stability.
• Heart and blood vessels. Estrogen helps regulate cholesterol and blood vessel health; post-menopause, heart disease, blood clot and stroke risk rises.
• Bones. Estrogen maintains bone density; its decline increases osteoporosis risk.
• Metabolism. Midlife hormone shifts impact insulin sensitivity and fat distribution. Decline in estrogen increases the risk of developing Type 2 diabetes.

Screenings to ask for, 40s and up

• FSH, Estradiol, Progesterone, Testosterone — assess reproductive hormone levels.
  • A note on these: estrogen and progesterone fluctuate widely during perimenopause, which means single measurements can be misleading. Single-point testing should be interpreted carefully, with expert guidance.
• Thyroid panel (TSH, T3, T4) — rules out thyroid dysfunction, which can mimic menopause symptoms.
• Lipid panel + A1C — checks cardiovascular and blood sugar health.
• Bone density scan (DEXA) — recommended at 50+, earlier if at high risk from family history or early menopause.

Daily habits that help

• Prioritize protein and resistance training. Supports muscle mass and metabolic health.
• Sleep 7–8 hours nightly. Crucial for hormonal balance, mental clarity, and recovery.
• Manage stress. Meditation, walking, breathwork — even five minutes helps lower cortisol.
• Track your symptoms. Logging patterns helps identify triggers and improves communication with providers.

How to speak with providers

Navigating midlife symptoms can be overwhelming — especially when you’re not sure what to ask. These are questions to bring to your next appointment, so you can get the answers, and the support, you deserve.

1. Could my symptoms be related to perimenopause?
2. Should we check my reproductive hormones?
3. Are there risks to waiting to treat?
4. Is hormone therapy safe for me?
5. What are my non-hormonal options?
6. Can you refer me to a menopause specialist?
7. Are there lifestyle changes that will make a difference?
8. What screenings do I need in the next 5 years?
9. Can I access care virtually or asynchronously?
10. How will we monitor progress?

What good care looks like

• You feel heard and respected.
• Your provider takes your symptoms seriously.
• Testing and treatment are personalized to your life stage.