Your cycle, explained
Clear, sourced guides to periods, hormones and the four cycle phases, plus how partners can actually help. Written for real life, not a biology exam.
Cycle Basics
Menstrual Cycle Hormones: Estrogen, Progesterone, LH, FSH
Meet the four main menstrual cycle hormones: estrogen, progesterone, LH and FSH. See how they rise and fall in each phase and what they do.
Cycle BasicsHow Long Is a Normal Menstrual Cycle? Days Explained
A normal menstrual cycle is about 28 days on average, but 21 to 35 days is common. Learn how to count your cycle and when length is worth checking.
Phases
Follicular Phase: Energy, Hormones, What to Expect
The follicular phase starts on day 1 of your period and ends at ovulation. See how hormones shift, how long it lasts and what many people notice.
PhasesLuteal Phase: Symptoms, Moods, Cravings and What Helps
The luteal phase is the stretch after ovulation and before your period. Learn what causes PMS symptoms, mood changes and cravings, and what can help.
PhasesMenstrual Cycle Phases: The 4 Stages Explained
Learn the 4 phases of the menstrual cycle: menstrual, follicular, ovulation and luteal. See what each one does, how long it lasts and what you might feel.
PhasesMenstrual Phase: What's Happening and What Helps
The menstrual phase is the first part of your cycle. Learn what happens in your body during your period, how long it lasts and gentle ways to feel better.
PhasesOvulation Phase: Signs, Timing and What to Know
Ovulation is when an ovary releases an egg. Learn the signs of ovulation, when it happens, how long the egg lasts and why tracking is not birth control.
Symptoms & Health
Irregular Periods: Causes and When to See a Doctor
Irregular periods are common and often have simple causes like stress or hormonal birth control. Learn what counts as irregular and when to see a doctor.
Symptoms & HealthLate Period but Not Pregnant? Common Reasons Why
A late period doesn't always mean pregnancy. Learn the common reasons periods run late, from stress and exercise to birth control, and when to see a doctor.
Symptoms & HealthMood Swings Before Your Period: Why and What Helps
Why do mood swings happen before your period? Learn what research says about hormones, how much people vary, and what helps you and your partner.
Symptoms & HealthPeriod Cramps Relief: What Actually Helps
Period cramps relief that works: heat, pain relievers like ibuprofen, gentle exercise, and when severe pain may point to endometriosis or another cause.
Symptoms & HealthPeriod Cravings: Why You Crave Food Before Your Period
Why do you get period cravings? Learn what research suggests about hormones and premenstrual appetite, plus realistic ways to handle cravings.
Symptoms & HealthPMS vs PMDD: Symptoms and When to Get Help
PMS vs PMDD explained: how the symptoms differ, how PMDD is diagnosed, what treatments exist, and when to see a doctor or call 988 for support.
Symptoms & HealthSleep and Your Cycle: Why Sleep Dips Before Your Period
Why sleep can get harder in the week before your period, what PMS and PMDD have to do with it, and simple habits that may help you rest better.
Partners & Relationships
How to Support Your Partner on Her Period: 9 Ideas
Learn how to support your girlfriend or partner on her period with practical, respectful steps: what to ask, what to offer, and what never to say.
Partners & RelationshipsMenstrual Cycle Guide for Partners: Phase by Phase
A plain-English menstrual cycle guide for partners: the four phases, what tends to change in each, and how to be supportive without making assumptions.
Partners & RelationshipsRelationship Tips by Cycle Phase: What Helps Most
Relationship and communication tips across the four cycle phases, with honest notes on individual variation, so you can use patterns as clues, not rules.
Partners & RelationshipsHow to Talk to Your Partner About Your Cycle
Not sure how to talk to your partner about your cycle? Learn how to decide what to share, what to say, and how to set boundaries without awkwardness.
Partners & RelationshipsWhy Share Your Cycle With Your Partner (and How)
Why share your cycle with your partner? Honest benefits for communication and support, plus how to keep control of what you share and set boundaries.
Lifestyle & Rituals
Cycle Syncing: What the Science Actually Says
Cycle syncing is everywhere on social media, but does it work? Here is what research shows about syncing food, workouts and plans to your cycle phases.
Lifestyle & RitualsEating for Your Cycle: Iron, Cravings and Facts
What to eat across your menstrual cycle without the fad claims: iron during heavy periods, PMS and cravings, and what research does and does not show.
Lifestyle & RitualsPeriod Care Package Ideas for Your Girlfriend: 15 Picks
What to get your girlfriend or partner on her period: 15 thoughtful care package ideas, from heat packs to snacks, plus how to personalize them.
Lifestyle & RitualsPlanning Your Week Around Your Cycle: A Gentle Guide
Plan study, work and social life around your cycle using tendencies, not rules. Learn what is known about energy, focus and PMS, and what is still unproven.
Lifestyle & RitualsRomanticize Your Cycle: Cozy Rituals for Every Phase
Turn your cycle into something to look forward to with cozy rituals for each phase, from period comfort to mid-cycle energy, with no unproven health claims.
Lifestyle & RitualsWorking Out Across Your Cycle: What to Know
Should you change your workouts by cycle phase? Research is limited, so here is how to listen to your body and ease period pain and PMS fatigue.
Apps & Privacy
Best Period Tracker Apps in 2026: An Honest Comparison
An honest 2026 comparison of Flo, Clue, Apple Cycle Tracking, Stardust, Natural Cycles and Mochi Moon: what each does best, pricing and privacy.
Apps & PrivacyFlo Alternatives: Period Trackers to Consider in 2026
Looking for a Flo alternative? Compare Clue, Apple Cycle Tracking, Natural Cycles, Stardust and Mochi Moon on features, pricing and privacy, as of October 2026.
Apps & PrivacyHow Accurate Are Period Tracker Predictions?
How accurate are period tracker apps? See why predictions are estimates, why ovulation is harder than period dates, and why apps are not birth control.
Apps & PrivacyHow to Track Your Period and Cycle: What to Log
Learn how to track your period and menstrual cycle, what to log, why it helps and how apps compare with paper. A simple starter guide for beginners.
Apps & PrivacyAre Period Tracking Apps Safe? Privacy Questions to Ask
Are period tracking apps safe? Learn what the FTC and Mozilla found, how to read privacy labels, and the questions to ask before you log your cycle.