What are the first signs of perimenopause?

The first signs of perimenopause typically include irregular menstrual periods, hot flashes, night sweats, mood changes, and sleep disturbances, according to the North American Menopause Society. These early symptoms usually begin in a woman's 40s as estrogen levels start to fluctuate unpredictably.

The most common initial signs of perimenopause include:

• Irregular periods: Changes in cycle length, flow intensity, or skipped periods entirely
• Hot flashes: Sudden feelings of intense heat, often accompanied by sweating
• Night sweats: Episodes of excessive sweating during sleep that may disrupt rest
• Mood fluctuations: Increased irritability, anxiety, or depression-like symptoms
• Sleep problems: Difficulty falling asleep, staying asleep, or early morning awakening
• Breast tenderness: Increased sensitivity or soreness in breast tissue
• Decreased libido: Reduced interest in sexual activity

According to the American College of Obstetricians and Gynecologists, perimenopause can begin as early as the late 30s but most commonly starts between ages 40-44. The transition period typically lasts 4-10 years before reaching menopause, defined as 12 consecutive months without a menstrual period.

Additional early warning signs may include brain fog or difficulty concentrating, joint aches and stiffness, dry skin, thinning hair, and weight gain, particularly around the midsection. Some women also experience headaches, dizziness, or changes in body odor during this transitional phase.

The severity and combination of symptoms varies significantly among women. While some experience mild changes, others may have more pronounced symptoms that impact daily functioning. Hormonal fluctuations during perimenopause can also exacerbate existing conditions like migraines or depression.

For example, a 42-year-old woman might notice her previously regular 28-day cycle becoming unpredictable, ranging from 21-35 days, accompanied by occasional hot flashes during meetings and difficulty sleeping through the night. These changes often prompt women to seek medical evaluation.

Tracking symptoms in a diary can help identify patterns and provide valuable information for healthcare providers. The diagnosis of perimenopause is typically based on symptom patterns and age rather than specific hormone tests, as hormone levels fluctuate dramatically during this transition. Understanding menopause hormone replacement therapy options becomes important as symptoms progress and impact quality of life.

Related: Pregnancy & Women’s Health · When should pelvic pain be evaluated by a doctor? · Why does bloating often change across the menstrual cycle? · What symptoms of menopause overlap with anxiety or depression?