Recognizing early perimenopause

At a Glance

• Early perimenopause represents the first stages of the transition to menopause.
• It can begin as early as age 35 for some women.
• This phase may last anywhere from 2 to 8 years, and sometimes up to 10 years.
• Unlike late perimenopause, menstrual cycles are often still regular at first. A regular menstrual cycle is one in which consecutive cycles vary by less than 7 days in length.
• Menstrual cycle irregularity is the main sign that distinguishes early perimenopause from late perimenopause, which is a more advanced phase of the transition to menopause.
• One of the earliest hormonal changes is typically a gradual decline in progesterone production.
• Symptoms may be physical, emotional, or cognitive and are often mistakenly attributed to stress, a busy lifestyle, or aging.

What Is Early Perimenopause?

Early perimenopause refers to the initial stages of the hormonal transition that occurs before menopause. It is associated with the natural aging of the ovaries and the gradual decline in ovarian function.

These changes can begin as early as the mid-thirties, sometimes around age 35. Although they often go unnoticed at first, they mark the beginning of a gradual shift in ovarian function that will continue until menopause.

The perimenopausal transition may last anywhere from two to eight years and, for some women, up to ten years before menopause occurs.

Contrary to popular belief, periods are still present during this stage and menstrual cycles are often regular. This is one reason why the early signs are frequently overlooked or attributed to other causes.

The First Hormonal Change: Declining Progesterone

One of the earliest hormonal changes during early perimenopause is a gradual decline in progesterone production.

Progesterone is produced primarily after ovulation. As women age, ovulation becomes less predictable and less efficient, leading to a relatively gradual and steady decline in progesterone levels.

Estradiol follows a different pattern. Although its overall trend is also downward over time, estradiol levels tend to fluctuate significantly from one cycle to the next. It is not uncommon for estradiol levels to remain normal—or even temporarily elevated—before declining more noticeably as menopause approaches.

The combination of gradually declining progesterone and significant fluctuations in estradiol contributes to many of the symptoms experienced during this transition.

As women move closer to menopause, deficiencies in both progesterone and estradiol generally become more pronounced, often resulting in more noticeable symptoms.

How Do Menstrual Cycles Change?

During early perimenopause, menstrual cycles generally remain regular. Some women may notice that their cycles become slightly shorter than they were previously.

As ovarian function continues to decline, cycles may gradually become longer before eventually becoming irregular (i.e. persistent ≥7-day difference in length of consecutive cycles), signaling late perimenopause.

Irregular periods are therefore not necessarily the first sign of hormonal change.

What Symptoms Can Occur?

The gradual decline in progesterone, combined with fluctuations in estradiol, can affect many different systems throughout the body.

Some women experience few symptoms, while others notice significant changes in their physical and emotional well-being.

Commonly reported symptoms include:

• Increased irritability
• Anxiety or feelings of nervousness
• Reduced motivation or energy
• Sleep disturbances
• Persistent fatigue
• Bloating or fluid retention
• Muscle and joint pain
• Hot flashes
• Breast tenderness
• Heavy menstrual bleeding or blood clots

These symptoms often develop gradually and may fluctuate from one cycle to the next, making them difficult to recognize.

Why Is It Often Missed?

Because menstrual cycles are still present and often remain regular, many women do not immediately connect their symptoms to hormonal changes.

They may seek help for sleep problems, anxiety, joint pain, persistent fatigue, or heavy bleeding without realizing that these symptoms may be part of the early stages of the transition to menopause.

Symptoms are frequently attributed to stress, mental load, family or professional responsibilities, or simply getting older.

Yet hormonal changes can play an important role in what many women experience during this stage of life.

“I Don't Feel Like Myself Anymore”

One of the most common phrases heard from women during this transition is:

"I just don't feel like myself anymore."

Many women describe a sense of feeling different without being able to identify exactly why. They may feel more irritable, more anxious, less resilient to stress, less motivated, or simply unlike the person they used to be.

For many women, early perimenopause does not begin with hot flashes or dramatic menstrual changes. Instead, it often presents as a persistent feeling that something has changed.

This experience is real, common, and deserves to be acknowledged.

When Should You Seek Help?

If you notice persistent changes in your mood, sleep, energy levels, or menstrual cycles, it may be helpful to speak with a healthcare professional who has expertise in perimenopause and menopause care.

Understanding what is happening in your body is often the first step toward finding clear answers and exploring the treatment options available to you.

Key Takeaways

Early perimenopause can begin as early as age 35 and may last for several years before menopause. Even when menstrual cycles remain regular, gradual declines in progesterone and fluctuations in estradiol can contribute to a wide range of physical and emotional symptoms.

If you feel like you are no longer quite yourself, know that you are not alone. Recognizing the early signs of perimenopause is often the first step toward gaining clarity and finding solutions that fit your needs.

Looking Ahead

In an upcoming article, we'll explore some of the lesser-known symptoms of perimenopause and explain why they are often attributed to other causes.

References and Further Reading

1. Harlow, S. D., Gass, M., Hall, J. E., Lobo, R., Maki, P., Rebar, R. W., Sherman, S., Sluss, P. M., de Villiers, T. J., & STRAW + 10 Collaborative Group (2012). Executive summary of the Stages of Reproductive Aging Workshop + 10: addressing the unfinished agenda of staging reproductive aging. The Journal of clinical endocrinology and metabolism, 97(4), 1159–1168. https://doi.org/10.1210/jc.2011-3362