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A normal menstrual cycle ranges from 21 to 35 days, with an average of 28 days. Only about 13% of women have a textbook 28-day cycle. Cycle length can vary by a few days from month to month — this is normal.

The 4 phases are: Menstrual (your period, days 1-5), Follicular (estrogen rises, days 6-13), Ovulation (egg release, around day 14), and Luteal (progesterone rises, days 15-28). Each phase has distinct hormonal patterns that affect your energy, mood, and body.

Cycle syncing is the practice of adjusting your nutrition, exercise, skincare, and lifestyle to match each phase of your menstrual cycle. By aligning your habits with your hormonal rhythm, you can optimize energy, reduce PMS symptoms, and feel your best throughout the month.

Cycle length variation is caused by stress, sleep changes, travel, illness, weight fluctuation, and hormonal shifts. The follicular phase (before ovulation) is the most variable part. The luteal phase is typically more consistent at 12-14 days.