TL;DR: Perimenopause, menopause, and andropause are natural hormonal transitions that affect both women and men. Perimenopause begins in the 40s and lasts 4–8 years; menopause is confirmed 12 months after a woman's final period (typically around age 51); andropause describes the gradual testosterone decline men experience from their 30s onward. All three stages are treatable, and personalized hormone therapy — including bioidentical options like Biote pellet therapy — can restore quality of life.
Your body is constantly changing. But somewhere in your 40s, those changes can start to feel less like natural aging and more like something is genuinely off. Energy dips. Sleep suffers. Moods shift without an obvious reason. For millions of people, these experiences trace back to a hormonal transition — and knowing which one you're in is the first step toward feeling better.
Perimenopause, menopause, and andropause each represent a distinct phase of hormonal change — and each one comes with its own set of symptoms, timelines, and treatment options. Understanding what separates them helps you recognize what your body is going through, ask the right questions, and get the right care. This guide walks through all three transitions: what defines each stage, what symptoms to watch for, and what modern treatment options actually look like. Whether you're a woman navigating irregular cycles and hot flashes, or a man noticing fatigue and low drive that just won't quit, understanding your hormones puts you in a much stronger position to do something about it.
What Is Perimenopause — and When Does It Actually Begin?
Perimenopause is the transitional phase that leads up to menopause. It begins when the ovaries gradually produce less estrogen and progesterone—and those fluctuating hormone levels drive most of the symptoms women associate with "the change." The difference between perimenopause and menopause is an important one: perimenopause is an ongoing process, while menopause is a single confirmed milestone.
What age does perimenopause start?
Perimenopause typically begins in the early-to-mid 40s, though some women notice changes in their late 30s. On average, it lasts four to eight years, ending twelve months after your final period — the point at which you've officially reached menopause. According to the World Health Organization, perimenopause can last several years and can affect physical, emotional, mental, and social well-being. Because hormone levels rise and fall unpredictably throughout this transition, symptoms can come and go and shift in intensity over time.
That variability is also why perimenopause frequently goes unrecognized. Many women attribute what they're experiencing to stress, thyroid issues, or simply getting older. A provider who works with hormones daily can help distinguish perimenopause from those other causes — and start building a plan based on what's actually happening.
What are the most common perimenopause symptoms?
Low estrogen symptoms in women during perimenopause can include:
-Irregular periods — cycles that become shorter, longer, heavier, or lighter
-Hot flashes and night sweats
-Sleep disruption or insomnia
-Mood changes, including anxiety, irritability, or low mood
-Brain fog and difficulty concentrating
-Fatigue and lower energy levels
-Weight gain, especially around the midsection
-Lower libido and changes in sexual desire
-Vaginal dryness or discomfort with intimacy
-Stronger PMS, breast tenderness, or new headaches
-Joint aches and stiffness
Research shows that approximately 55% of women begin experiencing hot flashes as they enter the perimenopausal transition — before they've even reached menopause. You don't need every symptom to be in perimenopause. If several of these sound familiar and are affecting your daily life, that's worth evaluating.
When should you seek care for perimenopause symptoms in Denver?
The right time to see a provider is when symptoms start interfering with sleep, work, mood, or your relationships — not only when they become severe. Early, conservative care can ease the transition and rule out other contributing conditions, like thyroid disorders or anemia.
At Cunningham Clinic in Denver, the care team starts with a thorough review of your symptoms, bloodwork, and health history before recommending anything. Treatment may include bioidentical hormone replacement therapy (BHRT) — including Biote pellet therapy — alongside targeted supplements, cycle and progesterone support, and lifestyle adjustments. Every plan is individualized and monitored over time, so it continues working as your needs evolve.
What Is Menopause — and How Is It Different from Perimenopause?
The difference between perimenopause and menopause is straightforward, though the two terms are often used interchangeably. Menopause is not a process — it's a moment. Specifically, it's the point confirmed twelve months after your final menstrual period, when your ovaries have stopped releasing eggs and produce significantly less estrogen and progesterone. According to the WHO, most women experience menopause between the ages of 45 and 55, with the average in the United States falling around age 51 — though surgical removal of the ovaries can trigger it earlier.
Everything before that twelve-month mark is perimenopause. Everything after it is postmenopause. The symptoms that most people associate with "menopause" — hot flashes, night sweats, sleep disruption — often begin during perimenopause and continue into the postmenopausal years.
What signals the end of menopause, and what symptoms does it bring?
Once estrogen drops significantly, the body adjusts to a new hormonal baseline. Common menopause symptoms include:
-Hot flashes and night sweats (vasomotor symptoms)
-Disrupted sleep and insomnia
-Vaginal dryness, irritation, or discomfort with intercourse
-Urinary urgency or more frequent urinary tract infections
-Mood changes — anxiety, irritability, or low mood
-Brain fog and trouble with memory or focus
-Lower libido
-Weight gain and changes in body composition
-Thinning hair and drier skin
-Joint aches and stiffness
-Accelerated bone loss, which raises the long-term risk of osteoporosis
Hot flashes are among the most widely reported symptoms: research published in the Journal of Mid-Life Health found that more than 80% of women experience them during menopause. For some, they can last well beyond the immediate transition — approximately one-third of women continue to experience hot flashes even 10 years after menopause. The severity varies widely from person to person. Some women move through menopause with minimal disruption; others find symptoms significantly affect their quality of life. Either way, effective treatment exists.
What are the most effective menopause treatment options in Denver?
Hormone therapy remains the most effective treatment for hot flashes, night sweats, and the genitourinary symptoms of menopause — and it also helps protect against bone loss. For most healthy women under 60, or within ten years of menopause, the benefits of hormone therapy generally outweigh the risks.
At Cunningham Clinic near Cherry Creek, treatment options include:
-Menopausal hormone therapy (MHT): Estrogen, combined with progesterone when appropriate, is the evidence-backed standard for vasomotor symptoms.
-Biote bioidentical hormone pellet therapy: A small pellet, roughly the size of a grain of rice, is placed just beneath the skin during a brief in-office visit. It dissolves gradually, releasing a steady stream of hormones over three to four months — without the peaks and dips that can come with daily pills or creams.
-Low-dose vaginal estrogen: For vaginal dryness and discomfort with intercourse, locally acting vaginal estrogen is a safe and highly effective option. In 2025, the FDA removed the boxed warning from low-dose vaginal estrogen products, reflecting their strong safety profile.
-Non-hormonal and lifestyle approaches: For women who prefer to avoid hormones, non-hormonal medications and evidence-based guidance on sleep, nutrition, and strength training can meaningfully reduce symptoms.
Every recommendation is based on your personal health history, not a one-size-fits-all protocol.
What Is Andropause? Understanding Testosterone Decline in Men
Andropause — sometimes called male menopause — is the gradual, age-related decline in testosterone that men experience over time. Unlike the relatively abrupt hormonal shift of female menopause, testosterone typically falls slowly: roughly one percent per year after about age 30, according to the Endocrine Society. That steady decline is why andropause often goes unnoticed for years. Symptoms tend to accumulate gradually, and many men attribute them to stress, poor sleep, or simply getting older.
Clinically, andropause is more accurately called late-onset hypogonadism. The distinction matters: not every man with lower testosterone levels needs treatment. What counts is the combination of confirmed low levels on bloodwork and symptoms that affect daily function. The Endocrine Society estimates that approximately 35% of men over age 45 have hypogonadism — a figure that rises to 30–50% among men with obesity or type 2 diabetes.
What are the most common low testosterone symptoms in men?
Low testosterone can show up in a range of ways, including:
-Persistent fatigue and low energy
-Reduced sex drive (low libido)
-Erectile difficulties
-Loss of muscle mass and strength
-Increased body fat, especially around the midsection
-Low mood, irritability, or a flat sense of motivation
-Brain fog and trouble concentrating
-Disrupted or poor-quality sleep
-Reduced bone density over time
-A general sense of not feeling like yourself
Many of these overlap with other conditions — thyroid dysfunction, poor sleep, and chronic stress can produce nearly identical symptoms — which is exactly why proper testing matters before starting any treatment.
How is low testosterone diagnosed?
Diagnosis starts with a morning blood test, when testosterone levels are naturally at their highest. A single low result isn't enough; the test should be confirmed on a second draw, together with a review of symptoms. According to the Endocrine Society, normal testosterone levels in adult men should fall between 300–1,000 ng/dL, depending on age and the lab used — and measurement must be repeated more than once for an accurate assessment.
At Cunningham Clinic in Denver, the diagnostic picture goes deeper than total testosterone alone. Free testosterone, SHBG, thyroid function, a complete blood count, and other related markers are reviewed to rule out other causes and build a plan grounded in data — not guesswork.
Is testosterone replacement therapy safe?
Modern evidence is reassuring. The large TRAVERSE trial — involving more than 5,000 men at elevated cardiovascular risk — found no meaningful increase in major cardiac events such as heart attack or stroke. In 2025, the FDA removed the long-standing boxed warning about cardiovascular risks from testosterone products, reflecting that evidence.
That said, testosterone replacement therapy (TRT) is not appropriate for everyone. Men who hope to father children should discuss this before starting, since testosterone therapy can reduce sperm production. Blood counts and prostate health also require regular monitoring throughout treatment.
What andropause treatment options are available in Denver?
When bloodwork confirms low testosterone alongside real symptoms, TRT can restore energy, libido, lean muscle, mood, and overall vitality. Cunningham Clinic, as a Biote Certified clinic, offers several delivery options matched to each patient's schedule and preferences:
-Biote bioidentical testosterone pellet therapy: Each pellet lasts four to five months for men, delivering a consistent, steady hormone release without the highs and lows of daily gels or injections.
-Injections: A well-established delivery method for men who prefer regular dosing with direct control.
-Topical gels: Applied daily, gels offer flexibility for men who prefer a non-invasive approach.
-Lifestyle and root-cause support: Sleep quality, strength training, body composition, alcohol intake, and stress levels all influence testosterone. These factors are addressed alongside any treatment plan.
What Does Personalized Hormone Care Actually Look Like?
Understanding perimenopause, menopause, and andropause at a conceptual level is useful. But navigating the transition well requires care that's built specifically around you — your symptoms, your lab results, your health history, and your goals.
A genuinely individualized approach starts with listening, not prescribing. Before anything is recommended, a credentialed provider reviews your full picture: what symptoms you're experiencing, when they started, how they're affecting your life, and what your bloodwork reveals. That foundation prevents the common mistake of treating the wrong problem — or treating a problem that doesn't need treatment at all.
Mood and libido changes are a good example. A fading sex drive or persistent low mood often traces back to hormonal shifts — low testosterone in men, or the estrogen and progesterone changes of perimenopause and menopause in women — but they can also stem from thyroid imbalance, poor sleep, stress, or medication side effects. Treating a hormonal imbalance when a thyroid issue is actually driving the symptoms won't help. Getting the diagnosis right first is what makes treatment effective.
Once a plan is in place, ongoing monitoring ensures it continues to work. Hormonal needs change as the body moves through different stages of a transition, and follow-up lab work allows for careful, data-driven adjustments. The goal throughout is always the minimum effective intervention — the least amount of treatment needed to produce real, lasting improvement.
At Cunningham Clinic in Denver's Cherry Creek neighborhood, care is led by Kimberly Cunningham, MSN, APRN, ANP-C, a nurse practitioner and adjunct faculty member at the University of Colorado College of Nursing. The team is fully Biote Certified and offers bilingual care in English and Spanish.
Take the First Step Toward Feeling Like Yourself Again
Perimenopause, menopause, and andropause are natural transitions — but natural doesn't mean inevitable suffering. Hot flashes, brain fog, low libido, exhaustion, and mood changes all have well-understood hormonal roots, and all of them can be addressed with the right care.
The most important step is getting an accurate picture of what's actually happening in your body. From there, a conservative, personalized plan — built around your symptoms, your bloodwork, and your goals — can make an enormous difference in how you feel day to day.
If you're ready to get answers, schedule a consultation with Cunningham Clinic in Denver. The team will take the time to listen, run the right labs, and build a plan that's genuinely suited to you.
Frequently Asked Questions
Perimenopause is the multi-year transition leading up to menopause, during which estrogen and progesterone fluctuate and periods become irregular. Menopause is a single confirmed point: twelve months after your final menstrual period. Everything after that is postmenopause. Symptoms often begin during perimenopause and can continue into the postmenopausal years.
Perimenopause typically begins in the early-to-mid 40s, though some women notice changes in their late 30s. On average, it lasts four to eight years before menopause is confirmed.
The most disruptive menopause symptoms are typically hot flashes, night sweats, sleep disruption, vaginal dryness, brain fog, and mood changes. Bone loss is a serious long-term concern as well, since declining estrogen accelerates bone thinning. Severity varies significantly from person to person.
Andropause is the gradual, age-related decline in testosterone in men — sometimes called male menopause. Unlike female menopause, which involves a relatively abrupt hormonal shift, testosterone in men falls slowly (roughly one percent per year after age 30 to 40). Andropause rarely has a single, definable moment; symptoms accumulate over years.
Common signs of low estrogen include hot flashes, night sweats, vaginal dryness, disrupted sleep, low mood, brain fog, reduced libido, weight gain, thinning hair, and joint aches. These symptoms frequently emerge during perimenopause and continue into menopause and postmenopause.
Low testosterone in women can contribute to low libido, fatigue, difficulty building or maintaining muscle, low mood, and reduced motivation. It's a treatable, frequently overlooked contributor to the symptoms women experience during perimenopause and menopause.
Bioidentical hormones are structurally identical to the hormones your body naturally produces, whereas traditional synthetic hormones may differ in molecular structure. Biote pellet therapy, offered at Cunningham Clinic, uses plant-derived bioidentical hormones in pellet form that deliver a steady, consistent hormone release over several months—avoiding the peaks and dips associated with daily pills or creams.
The right indicator is symptoms that are affecting your quality of life — sleep, mood, energy, sexual health, or daily functioning — combined with lab work that confirms a hormonal imbalance. Not everyone needs hormone therapy, and the decision should always be individualized based on your health history, goals, and risk factors. A credentialed provider can help you decide.
Call Cunningham Clinic at 720-650-4660 or book an appointment online. The clinic is located at 695 S Colorado Blvd, Suite 160, in Denver's Cherry Creek neighborhood, and offers bilingual care in English and Spanish.