✨ Girls, Let's Talk... Hormones

Welcome to
Hormone HQ.

Think of your hormones as your body’s built-in notification system. Each hormone has a sender, a destination and a job. The right cells receive the update and know what to do next.

🌷 Oestrogen → Uterus: rebuild the lining.
🥚 LH → Ovary: release the egg.
🌙 Melatonin → Brain: switch towards night mode.
↓ OPEN THE NOTIFICATION CENTRE
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Your body sends a message.

Your body notices something, maybe it is time to wake up, eat, grow, ovulate, respond to stress or get ready for sleep.

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Your hormones spread the message

Hormones are chemical messengers. They travel through your body carrying messages (or signals) from one place in your body to another.

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The right person gets it.

Cells that recognise that hormone can respond to the message, helping change things like energy, sleep, appetite, growth, stress responses or your menstrual cycle.

🔔 Hormone HQ · Notifications
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🔒 9:41 Hormone HQ · notifications on
Notification Centre 8 updates
Tap a notification to open that hormone in Settings →
‹ Notifications •••
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Hormone notification settings

Every hormone has a sender, a destination and a job. Tap one below to see where the notification comes from, who receives it and what it is asking the body to do.

👀 Important: these are simplified examples. One hormone can act on several tissues, and only cells with the right receptor can respond to its signal.
Sent fromAdrenal glands
Sent toMany body tissues
Common timingMorning + stress
💬 Girl Talk: “We’re awake / something needs attention. Make more energy available so we can deal with it.”
🔬 Health science: Cortisol helps the body respond to stress and helps make glucose and other fuel available.
Sent fromMainly stomach
Sent toBrain / hypothalamus
Common timingOften rises before food
💬 Girl Talk: “Brain? Stomach here. We could do with food soon — turn the hunger reminder up.”
🔬 Health science: Ghrelin is made mainly in the stomach and helps signal hunger to the brain.
Sent fromPancreas
Sent toMuscle, fat + liver
Common timingWhen blood glucose rises
💬 Girl Talk: “Fuel delivery! Muscle and fat cells, take glucose in. Liver, help store what we don’t need right now.”
🔬 Health science: Insulin helps move glucose into muscle and fat cells and helps the liver store fuel.
Sent fromMainly ovaries
Sent toUterus, brain, bones + more
Common timingRises before ovulation
💬 Girl Talk: “Uterus, rebuild the lining. Brain and other tissues, here’s the latest cycle update.”
🔬 Health science: Oestrogen helps the uterine lining grow and also acts on the brain, bones and many other tissues.
Sent fromPituitary gland
Sent toOvary
Common timingMid-cycle surge
💬 Girl Talk: “Ovary, mature follicle: GO. It’s time to release the egg.”
🔬 Health science: A sharp rise in LH helps trigger ovulation and the release of an egg from the ovary.
Sent fromCorpus luteum in ovary
Sent toUterus + other tissues
Common timingAfter ovulation
💬 Girl Talk: “Uterus, keep the lining ready. We’ve ovulated and we’re waiting to see what happens next.”
🔬 Health science: Progesterone rises after ovulation and helps prepare and maintain the uterine lining.
Sent fromOvaries + adrenal glands / body tissues
Sent toMuscle, bone, brain + more
Common timingPresent throughout the month
💬 Girl Talk: “Muscles and bones, keep supporting normal strength and maintenance. Also: yes, girls have testosterone.”
🔬 Health science: Testosterone is also present in girls and women and acts on tissues including muscle and bone.
Sent fromPineal gland
Sent toBrain + body-clock systems
Common timingDarkness / night
💬 Girl Talk: “It’s dark. Brain and body clock, switch the schedule towards night mode.”
🔬 Health science: Melatonin is released mainly at night and helps coordinate the body’s circadian, or 24-hour, timing.
Hormones travel in the bloodstream. The notification only “opens” in cells that have the right receptor for that hormone.

"... has sent you a notification" 👀

Your brain and different parts of your body are constantly communicating — sending little messages, changing the plan and letting everyone know what needs to happen, when it needs to happen and who needs to do it.

Messages like:
“Wake up”
“We need food”
“Can we go to bed”
“We’re not doing that”

We can’t physically see these messages in the real world, but the right cells, organs and body parts can receive the signal and respond to it.

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Textbook Terminology:

Different parts of your body communicate using electrical and chemical signals. Your brain, nervous system and hormones use these signals to help control things like sleep, hunger, growth and your menstrual cycle.

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Girl Talk Translation:

Think of your hormones as your body’s built-in notification system 🔔
Your brain 🧠, organs and different body parts 🦴🫀 are constantly sending and receiving little updates — letting everyone know what’s happening, when it’s happening and who needs to do something about it.