Many women start feeling “off” in their mid-30s or early 40s.
Maybe your sleep isn’t as good as it used to be.
Your mood feels more unpredictable.
Weight seems easier to gain.
Or you simply feel more tired than usual.
Many women assume these changes are just stress or aging. But in many cases, they are actually the first signs of perimenopause and shifting hormones.
Understanding these early hormone changes — especially low progesterone — can help you identify what’s happening in your body and what you can do about it.
What Is Perimenopause?
Perimenopause is the transition period before menopause, when hormone levels begin to fluctuate and gradually decline.
While menopause is defined as going 12 months without a menstrual period, perimenopause can begin years earlier, often in the late 30s or early 40s.
During this time, your ovaries begin producing less estrogen and progesterone, which can lead to noticeable physical and emotional changes.
One of the earliest hormonal shifts is a decline in progesterone.
The First Hormone to Drop: Progesterone
Progesterone is a hormone that plays an important role in:
- Sleep quality
- Mood stability
- Menstrual cycle regulation
- Stress response
- Metabolism
Progesterone is produced after ovulation. As ovulation becomes less consistent in the late 30s and early 40s, progesterone levels begin to decline first.
This creates a hormone imbalance where estrogen becomes relatively higher than progesterone, often called estrogen dominance.
For many women, this imbalance is what causes the first symptoms of perimenopause.
Common Symptoms of Low Progesterone
Low progesterone can affect multiple systems in the body. Common symptoms include:
Sleep Problems
- Trouble falling asleep
- Restless sleep
- Waking frequently at night
Mood Changes
- Anxiety
- Irritability
- Mood swings
- Feeling overwhelmed
Changes in Your Cycle
- Shorter menstrual cycles
- Heavier periods
- Increased PMS symptoms
Physical Symptoms
- Breast tenderness
- Bloating
- Headaches
Low Energy
Hormone fluctuations can leave many women feeling constantly tired or drained. If fatigue is a major concern, treatments like IV or IM nutrient therapy may help support energy levels and recovery.
Weight Gain
Hormonal changes during perimenopause can slow metabolism and make weight loss more difficult. Many women notice increased belly fat or stubborn weight gain during this stage.
Other Signs You May Be Entering Perimenopause
As hormone changes progress, you may also experience:
- Brain fog
- Low libido
- Night sweats
- Hot flashes
- Vaginal dryness
- Irregular periods
Not every woman experiences the same symptoms, and many notice only subtle changes at first.
Can Hormone Therapy Help?
Many women begin experiencing hormonal shifts years before menopause, and identifying these changes early can make a profound difference in how you feel. If you are struggling with disrupted sleep, low energy, mood swings, or unexplained weight gain, your hormones may be out of balance.
Hormone Replacement Therapy (HRT) helps restore the vital link between estrogen, progesterone and testosterone, allowing your body to function optimally again. Beyond relieving immediate symptoms, balanced hormones support long-term heart and bone health, helping you regain your vitality and focus.
Should I get my hormones checked?
If you’ve been struggling with sleep, noticing shifts in your mood, or feeling an unexplained fatigue that no amount of rest seems to fix, your hormones may be trying to tell you something. Weight changes that seem to happen without reason, irregular cycles, or a dip in your sex drive are also common signs that something is off beneath the surface.
These symptoms are easy to dismiss or chalk up to stress, but they’re worth paying attention to. Identifying them early gives you the opportunity to get ahead of how you feel rather than simply pushing through it. The right support at the right time can make a meaningful difference in your energy, your mood, and your overall quality of life.
If any of this sounds familiar, it may be time to evaluate your hormones.
The Bottom Line
Perimenopause is a natural stage of life — but struggling through symptoms doesn’t have to be. Understanding the early drop in progesterone can help explain many of the changes women experience in their late 30s and 40s. With the right support and treatment options, you can restore balance, improve energy, and feel like yourself again. If any of this sounds familiar, you don’t have to just push through it. We’re here to help you figure out what’s going on and find what works for you.
AUTHOR INFORMATION
Ashley Regal, MSN, AGPCNP-BC
Board-Certified Nurse Practitioner
Ashley Regal, MSN, AGPCNP-BC, is a board-certified nurse practitioner with a focus on optimal health and preventive medicine.
With more than ten years of advanced practice experience, she integrates the best of functional and conventional medicine to uncover and address the root causes of health concerns. Her philosophy centers on listening to the body and restoring balance naturally for lasting wellness.
Nationally certified in hormone replacement therapy, aesthetics, and peptide therapy, Ashley combines her clinical expertise with a holistic perspective to guide patients toward sustainable, long-term success in their wellness journey.