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Hormone fluctuations explained (in plain English)
Summary
Your hormones are not just about periods or pregnancy - they affect your mood, energy, motivation, sleep, appetite, and how you feel in your body every single day. In this article, we break down the key players in your cycle - oestrogen, progesterone, and more - in language that actually makes sense.
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🌿 Key takeaways
Hormone fluctuations across the cycle: what to know
- Your hormones shift significantly across four phases each month, affecting energy, mood, focus, confidence, libido, and sleep
- Oestrogen is the energiser, progesterone the calmer, testosterone the spark - and when they drop, so can serotonin and GABA
- The luteal phase is when PMS and PMDD symptoms peak, driven by falling progesterone and oestrogen and the knock-on effect on neurotransmitters
- Chronic stress, poor sleep, low magnesium, and gut imbalances can all disrupt hormonal rhythm - even with a regular cycle
- Understanding your cycle is step one. Supporting it is where Evelyn comes in
Why you feel like a different person each week
Ever wondered why one week you are excelling at work, full of ideas - and the next you are anxious, tired, snappy, or withdrawn? By the time your period hits, you just want to hide.
That is not just moodiness. It is hormonal fluctuation. Your body is not broken - it is cycling.
🧠 In simple terms: Knowing which hormones are rising and falling - and how they affect your mind and body - is one of the most useful things you can do for your health. Once you understand the pattern, the fluctuations start to make sense instead of catching you off guard.
Meet your hormones
Think of these as your hormonal main characters.
| Hormone | Think of it as | What it does |
|---|---|---|
| Oestrogen | The energiser | Builds mood, motivation, memory, and libido |
| Progesterone | The calmer | Supports sleep and reduces anxiety (when balanced) |
| Testosterone | The spark | Boosts confidence, drive, and sexual energy |
| Cortisol | The stress barometer | Regulates your stress response |
| Serotonin and GABA | The mood managers | Keep emotions in check - directly influenced by the hormones above |
Here is how they interact throughout your cycle.
Menstrual phase (day 1–5)
🧪 Hormones: all low
🧠 Feels like: tired, introverted, and possibly emotional
Your period starts on day 1. Hormone levels are at their lowest, which can lead to cramping, fatigue, and lower mood. It is normal to want quiet. You are not lazy - you are in reset mode.
🌿 Support this phase with: iron-rich foods, warm grounding meals, rest, and gentle movement. Read more: Luteal phase nutrition guide
Follicular phase (day 6–14)
🧪 Hormones: oestrogen rising, testosterone climbing
🧠 Feels like: clear, motivated, and social
Rising oestrogen boosts serotonin and dopamine - which explains the improved mood and mental clarity. You may feel more confident, physically energised, and ready to take on new challenges.
This is your best phase for:
- Brainstorming and creative thinking
- Socialising and networking
- Strength workouts and higher-intensity exercise
- Starting something new
🔗 Read: Managing PMS and PMDD symptoms: a complete guide to feeling more like yourself
Ovulation (around day 14)
🧪 Hormones: oestrogen peaks, LH spikes, testosterone surges
🧠 Feels like: bold, sharp, and confident
This is your supercharged moment. Oestrogen peaks, LH (luteinising hormone) triggers the release of an egg, and testosterone gives you extra drive. Libido, communication skills, and confidence are all at their highest.
🧪 What the science says: The ovulation window is when peak oestrogen and testosterone create a measurable uplift in cognitive performance, verbal fluency, and social confidence - making it an ideal time for high-stakes conversations and presentations.
Luteal phase (day 15–28)
🧪 Hormones: progesterone rises then crashes; oestrogen dips; serotonin may drop
🧠 Feels like: irritable, anxious, tired, and emotional - also known as PMS
This is the most challenging phase for many people. Progesterone is supposed to calm you, but if you are sensitive to its fluctuations, you may feel more on edge. The drop in progesterone and oestrogen affects GABA and serotonin, making it harder to regulate emotions in the days before your period.
This is when you may experience:
- Mood swings and irritability
- Cravings for carbohydrates or sugar
- Bloating and physical discomfort
- PMDD flares in people who are sensitive to hormonal fluctuations
⚠️ Worth noting: In PMDD, the brain responds atypically to normal hormonal fluctuations - particularly to progesterone's metabolite allopregnanolone. This is not about hormone levels being too high or too low, but about the brain's sensitivity to normal shifts.
What affects hormone balance?
Even with a regular cycle, external factors can disrupt your hormonal rhythm and amplify symptoms.
Chronic stress
High cortisol suppresses oestrogen production, disrupting mood, energy, and cycle regularity.
Low magnesium
Magnesium is required for serotonin and GABA production. Deficiency makes emotional regulation in the luteal phase significantly harder.
Inflammation and gut imbalances
Systemic inflammation amplifies cramping, bloating, and mood swings. Gut dysbiosis can disrupt oestrogen metabolism and serotonin production.
Hormones in plain English: summary
| Phase | What is rising (or falling) | How you might feel |
|---|---|---|
| Menstrual | Nothing (all low) | Flat, tired, and sensitive |
| Follicular | Oestrogen and testosterone rising | Clear, focused, and energised |
| Ovulation | LH spikes, testosterone surges, oestrogen peaks | Peak confidence and creativity |
| Luteal | Progesterone drops, oestrogen dips | Anxious, moody, and tired |
Want to feel more balanced all month?
Understanding your hormones is step one. Supporting them is where Evelyn comes in.
Cycle-aware. Non-hormonal. Evidence-based.
The Evelyn Routine
Rhythm · Restore · Revive. Three products, sixteen actives, one coordinated system for your cycle.
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Disclaimer: This content is for informational purposes only and is not intended as medical advice. Always speak to a qualified healthcare professional about any health concerns.
