Is This Perimenopause?

8 Signs Many Women Notice in Their Late 30s

Perimenopause is the transition leading up to menopause. For many women, it can begin earlier than expected — sometimes in their late 30s or early 40s.

Because the symptoms can be subtle and unpredictable, many women assume they are simply stressed, overworked, or not sleeping well. In reality, hormonal shifts may already be starting.

Here are eight signs women often notice during early perimenopause.

1. Changes in Your Menstrual Cycle

One of the earliest signs of perimenopause is a shift in your cycle.

You may notice:

• Periods becoming shorter or longer

• Heavier or lighter bleeding

• Cycles that arrive earlier or later than usual

Hormone levels fluctuate during perimenopause, which can affect ovulation and cycle timing.

2. Sleep Disturbances

Many women begin waking in the middle of the night or having difficulty falling asleep.

You might experience:

• Waking around 2–4 AM

• Restless sleep

• Nighttime overheating or sweating

Hormonal changes can influence the body’s sleep regulation and temperature control.

3. Increased Anxiety or Mood Changes

Some women notice new or stronger feelings of anxiety, irritability, or emotional sensitivity.

You might feel:

• More overwhelmed than usual

• Sudden mood shifts

• Increased tension or worry

These emotional changes can be connected to fluctuations in estrogen and progesterone.

4. Brain Fog or Forgetfulness

Many women describe a sense of mental fog during perimenopause.

Common experiences include:

• Difficulty concentrating

• Forgetting words or appointments

• Feeling mentally slower than usual

These cognitive changes can feel unsettling but are commonly reported during hormonal transitions.

5. Fatigue or Low Energy

Even after a full night’s sleep, some women feel unusually tired.

You might notice:

• Mid-afternoon energy crashes

• Feeling drained after normal activities

• Reduced motivation or stamina

Hormonal fluctuations, sleep disruption, and stress can all contribute to fatigue.

6. Hot Flashes or Night Sweats

Hot flashes are often associated with menopause, but they can begin during perimenopause as well.

You may experience:

• Sudden waves of warmth

• Flushing of the face or chest

• Sweating during sleep

For some women, these symptoms are mild at first.

7. Changes in Weight or Metabolism

Some women find it easier to gain weight or harder to maintain their usual weight.

You might notice:

• Weight gain around the abdomen

• Slower metabolism

• Changes in appetite or cravings

Hormonal shifts can influence metabolism, insulin sensitivity, and body composition.

8. Reduced Libido or Vaginal Dryness

Hormonal changes during perimenopause can affect sexual health.

Some women notice:

• Lower interest in sex

• Vaginal dryness or discomfort

• Changes in arousal or sensitivity

These symptoms are common but often rarely discussed.