Periods, hormones and everything in between, in plain English.
165 short reads, each with its sources underneath, last checked October 2026.
In short: The Splash library is 165 plain-English articles on periods, cycles, fertility, contraception, pregnancy and perimenopause. Each one opens with a quick answer, lists its sources (NHS, NICE, ACOG, WHO and peer-reviewed research) and shows when those sources were last checked. It is written by the Splash team and free to read.
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The four phases, in depthMenstrual, follicular, ovulation and luteal, and what each one is doing.Menstrual and follicular phases overlap: both start on day 1.5 min read →Every topic
- Cycle basics
How your four phases ebb and flow. 16 reads
- Period care
Cramps, products, flow and comfort. 16 reads
- Body literacy
Reading the signs your body sends. 14 reads
- Fertility & TTC
Ovulation, the fertile window, trying. 16 reads
- Contraception
Every method, honestly compared. 16 reads
- Sex & relationships
Pleasure, consent, desire and care. 12 reads
- Conditions
PCOS, endo, fibroids and more. 17 reads
- Nutrition
Eating kindly through your cycle. 12 reads
- Movement & sleep
Training, rest and recovery. 13 reads
- Mind & mood
PMS, PMDD, anxiety and calm. 13 reads
- Pregnancy & postpartum
From test day to the fourth trimester. 16 reads
- Perimenopause
The transition, decoded. 11 reads
- Apps & privacy
Choosing a tracker, what happens to your data, and how accurate apps really are. 5 reads
Your cycle, phase by phase
Short courses
All 21 courses →- How your cycle worksExplain the four phases to a friend, know what a normal cycle looks like, and know when your cycle is telling you something.6 reads · 25 min
- Period pain and heavy periodsEase cramps, tell normal flow from heavy, and know exactly when to talk to a GP and what to say.8 reads · 33 min
- Your period toolkitPick the products that suit you, use them with confidence, and handle leaks, nights and workouts.6 reads · 24 min
- Mood, PMS and PMDDSee how your cycle shapes your mood, calm a tough week, and spot when it is more than PMS.8 reads · 32 min
- Body confidence and being kind to yourselfGet through bloat, spots and low-energy days with less self-criticism and a few habits that help.6 reads · 16 min
- Sleep, energy and movementSleep better, move in ways that suit your body, and plan rest and effort around your own energy.8 reads · 22 min
Words, decoded
The full glossary →- LH surge
- A sudden rise in luteinising hormone that triggers the ovary to release an egg, usually within about 36 hours.
- Luteal phase
- The stretch from ovulation to your next period, usually around 10 to 16 days.
- Prostaglandins
- Hormone-like chemicals that make the womb contract during your period. More of them usually means stronger cramps.
- PMDD
- Premenstrual dysphoric disorder: a severe, cyclical form of PMS where mood symptoms seriously disrupt life in the luteal phase and ease within a few days of your period starting.
Written by the Splash team from NHS, NICE, ACOG, WHO and peer-reviewed sources. No clinician has reviewed these articles yet, and we say so on purpose. How we write and check · How Splash predicts.
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