What it means
A hormone is a chemical messenger. Glands release hormones into the blood, and they travel to distant tissues to change how those tissues work.
The main hormone systems relevant to puberty:
- Ovaries produce oestrogen and progesterone.
- Testes produce testosterone.
- Thyroid produces hormones that control metabolism, energy and growth.
- Adrenal glands produce adrenaline, cortisol and, from around puberty, some androgens.
- Brain (hypothalamus and pituitary) coordinates all of the above.
These systems talk to each other constantly. That is why a symptom in one place — mood, skin, sleep — often appears before the cause is obvious.
What can vary
- Levels rise and fall across the day, across the month, and across years. A single blood test is often less useful than a pattern.
- Starting periods changes the pattern, because the cycle introduces a monthly rise and fall.
- Sensitivity varies. Two people with the same hormone level can experience very different symptoms.
- Stress hormones overlap. Cortisol rises with poor sleep, illness, exercise and psychological stress — and it affects the same systems.
Possible explanations
Common hormonal effects during and after puberty include growth, skin oil production, body hair, libido, mood, sleep timing, appetite and bone density.
What hormones do not explain: every bad mood, every spot, every tired feeling. Attributing a symptom to “hormones” is easy and often wrong, and it can delay finding the real cause.
Warning signs
Hormonal problems — thyroid conditions, PCOS, prolactin issues — usually present as clusters of symptoms rather than one. The combinations worth being assessed for include:
- Periods that stop, or become very irregular, alongside fatigue, weight change, temperature intolerance and mood change
- Acne that is severe and unresponsive, alongside irregular periods
- Breast changes alongside fertility problems
- Persistent fatigue, weight change and feeling unusually cold or hot
What to do next
Ask about testing rather than assuming. Thyroid function, iron status and sometimes reproductive hormones are the tests that often help; broad “hormone panels” are frequently unhelpful and expensive.
Keep a symptom diary across a full month so patterns are visible. That is more informative than any single measurement.
Self-care
Sleep, regular meals, movement and managing stress all support the hormonal system. There is no supplement that “balances hormones,” and that phrase is used to sell things.
If a product claims to fix your hormones, ask what is actually being changed and what the evidence is.
When to seek help
Routine: questions about how hormones work.
Prompt: the symptom clusters listed above, or symptoms affecting daily life.
Emergency: not for hormonal questions.
How to talk about it
“I’ve had irregular periods for six months and I’m always exhausted.”
“Is hormone testing actually worth doing?”
“I’ve been told my hormones are out of balance — what does that mean?”
Related articles
Sources
Public sources are linked so you can read the detail rather than take this site’s word for it. None of this has yet been reviewed by a qualified clinician — see how we handle medical review.
References
Where this comes from
Linked so you can check it against a recognised public health source rather than take this site's word for it.
- Endocrine disruptors — WHO World Health Organization (opens in a new tab)
- Adolescent health — WHO World Health Organization (opens in a new tab)
These are public sources from recognised health organisations, linked so you can read the detail rather than take this site's word for it. Reading them does not tell you whether any of it applies to you, and none of these articles has yet been reviewed by a qualified clinician. How we handle sourcing and review.