What is happening 7 days before your period?
Short answer: Seven days before your period you are usually in the mid-to-late luteal phase, when progesterone produced by the corpus luteum is high and many people experience premenstrual symptoms (PMS). If pregnancy has not occurred, progesterone and estrogen will fall in the days before bleeding, triggering menstruation.
Explanation
About a week before a typical 28-day period (around cycle day 21) the body is in the luteal phase following ovulation. The corpus luteum secretes progesterone, which supports the uterine lining and raises basal body temperature. Estrogen levels are lower than during the pre-ovulatory rise but may have a small secondary increase. Common physiological effects include breast tenderness, bloating, fluid retention, mild acne, cravings, and mood changes; these are collectively called premenstrual symptoms and are driven by hormone levels and individual sensitivity to them. If an egg is not fertilized, the corpus luteum degenerates, progesterone and estrogen fall, and the uterine lining is shed as menstruation. Timing and symptom severity vary with cycle length and individual differences; luteal phase length is relatively stable for each person but generally ranges about 10–16 days.
Tips
- Track your cycle (calendar, apps, temperature) to predict the luteal phase and symptoms.
- Manage symptoms with sleep, regular exercise, reduced salt/caffeine, and balanced meals.
- Use over-the-counter pain relief (ibuprofen/naproxen) for cramps and breast discomfort as directed.
- Consider hormonal contraception or SSRIs for severe PMS/PMDD after discussing with a clinician.
- See a healthcare provider if symptoms are severe, disabling, or suddenly different from your usual pattern.
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