Period Tool

PMS Calculator

Predict your PMS symptom window before your period.

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PMS Window Calculator

PMS Begins
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Peak Symptoms
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PMS Ends
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PMS typically starts 1-2 weeks before period and resolves 1-2 days after it begins.

What Is PMS?

Premenstrual syndrome (PMS) refers to physical and emotional symptoms in the luteal phase — 1-2 weeks before menstruation. It affects ~75% of women. Symptoms include bloating, breast tenderness, mood swings, irritability, and fatigue caused by hormonal fluctuations after ovulation.

Evidence-Based PMS Relief

  • Calcium 1000mg/day reduces PMS severity
  • Magnesium 200-400mg/day reduces bloating
  • Regular aerobic exercise during luteal phase
  • Reduce salt, caffeine and alcohol 2 weeks before period
  • 7-9 hours sleep nightly

Medical Disclaimer: This tool is for educational purposes only and should not replace professional medical advice. Always consult a qualified healthcare provider.

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Predict Your PMS Days — Be Prepared

PMS (premenstrual syndrome) symptoms typically begin 7–14 days before your period and resolve once bleeding starts. Our PMS calculator predicts your personal PMS window based on your cycle, so you can prepare, adjust your schedule, and manage symptoms proactively rather than being caught off guard.

Most Common PMS Symptoms

  • Mood changes: Irritability, anxiety, tearfulness, mood swings
  • Physical: Bloating, breast tenderness, headaches, fatigue
  • Cravings: Sugar, carbohydrates, chocolate (progesterone-driven)
  • Sleep disturbances: Insomnia or excessive tiredness
  • Skin: Breakouts, particularly on jawline and chin

Science-Backed PMS Relief

  • Magnesium glycinate (300–400mg): Reduces bloating, mood swings, and headaches
  • Calcium (1200mg/day): Shown to reduce PMS severity by up to 50%
  • Vitamin B6: Supports serotonin production — helps mood symptoms
  • Regular aerobic exercise: Releases endorphins that counter PMS mood effects
  • Reduce salt, caffeine, and alcohol: All worsen bloating and mood symptoms

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How long does PMS last?

PMS typically starts 7–14 days before your period (during the luteal phase) and resolves within 4 days of bleeding starting.

What is the difference between PMS and PMDD?

PMDD (Premenstrual Dysphoric Disorder) is a severe form of PMS with debilitating mood symptoms that significantly impair daily functioning. It affects 3–8% of women and responds well to SSRIs and hormonal treatment.

Can birth control eliminate PMS?

Combined oral contraceptives can significantly reduce PMS symptoms for many women by stabilizing hormone fluctuations. However, some women find their mood symptoms worsen on the pill.

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🌸 BloomHealthWoman.com · For information only · Not medical advice