Cycle syncing, defined.
Hormones, phases, mechanisms, tracking methods, conditions, and practice. Hedged where the evidence is thin. Grouped by topic so you can scan by interest.
152 entries published. More on the way.
Symptoms
What cycle-related symptoms feel like and when they hit.
- PMS (Premenstrual Syndrome)
- PMDD (Premenstrual Dysphoric Disorder)
- Period brain (cycle brain fog)
- Energy crash (cycle-related fatigue)
- Premenstrual cravings
- Cyclical bloating
- Cyclical mood swings
- Hormonal acne
- Mittelschmerz (ovulation pain)
- Cyclical breast tenderness
- Dysmenorrhea (period pain)
- Menstrual migraine
- Cyclical depression
- Premenstrual anxiety
- Heavy menstrual bleeding (menorrhagia)
- Light or absent periods
- Mid-cycle spotting
- Period clots
- Cyclical insomnia
- Premenstrual irritability
- Cyclical IBS flare
- Catamenial epilepsy
Physiology
The biology of the menstrual cycle, from menarche to menopause.
Hormones
Estrogen, progesterone, FSH, LH, and the supporting cast.
- Estrogen (estradiol)
- Progesterone
- Testosterone (in women)
- FSH (Follicle Stimulating Hormone)
- LH (Luteinizing Hormone)
- LH surge
- Cortisol (cycle interaction)
- Prolactin
- Thyroid hormones (cycle)
- DHEA (dehydroepiandrosterone)
- Androgens (in women)
- SHBG (sex hormone binding globulin)
- Insulin (cycle interaction)
- Estrogen dominance
- Luteal phase defect
- Phytoestrogens
- Xenoestrogens
- Hormone Replacement Therapy (HRT)
Mechanism
Neurotransmitters and biological rhythms that translate hormones into experience.
- BDNF (Brain-Derived Neurotrophic Factor)
- Dopamine (cycle modulation)
- Serotonin (cycle modulation)
- GABA
- Allopregnanolone
- Infradian rhythm
- Circadian rhythm (vs infradian)
- Hormone-cognition link
- Neuroplasticity (cycle modulation)
- Sleep architecture (cycle shifts)
- Heart rate variability (HRV) and cycle
- Body temperature regulation (cycle)
- Inflammation (cycle modulation)
- Insulin sensitivity (cycle)
Phases
The four phases and sub-phases, with what shifts in each.
Practice
How cycle syncing works as a practice, applied across work, food, and movement.
- Cycle syncing
- Phase-based scheduling
- Cycle-aware productivity
- Phase rotation (work modes)
- Cycle anchor date
- Cycle re-anchoring
- Phase-aligned workouts
- Phase-aligned nutrition
- Phase-aligned sleep
- Phase-aligned skincare
- Seed cycling
- Deep work in follicular phase
- Editing in luteal phase
- Cycle syncing on birth control
- Cycle syncing for PCOS
- Cycle syncing in perimenopause
- Cycle syncing for endometriosis
- Cycle syncing for athletes
Tools
Tracking methods, apps, and devices that help you observe your cycle.
- Cycle tracking
- Period tracker (vs cycle syncing app)
- Symptom logging
- Basal body temperature (BBT)
- BBT thermometer
- Cervical mucus tracking
- Fertility Awareness Method (FAM)
- Sympto-thermal method
- Standard Days Method
- Calendar method
- Lactational Amenorrhea Method (LAM)
- Ovulation Predictor Kit (OPK)
- Cycle tracking wearable
- Continuous fertility monitor
- Phase calculator
- Cycle data export
- Privacy-first cycle tracking
Conditions
PCOS, perimenopause, endometriosis, and other conditions that change the picture.
Birth control
Hormonal and non-hormonal methods, and how each interacts with cycle syncing.
Nutrition
Supplements and nutrients with cycle-relevant evidence.
People
Researchers, authors, and figures who shaped cycle syncing as a practice.
Research
Key papers and reviews that ground (and sometimes deflate) cycle syncing claims.