What hormones are
Hormones are chemical messengers made by glands and carried in the blood to act elsewhere in the body. During puberty their levels change…
13-15 6 min read
Ages 13-15
Understanding your changing body
For most people this is the stage where puberty becomes impossible to ignore. This pathway covers the biology, the practical questions, and how to start finding trustworthy health information for yourself.
Assumes you know the basic body terms and explains the biology behind what you are noticing.
The awkward questions belong here
If you have a question you cannot ask anyone out loud, you are exactly the reader this pathway is written for. Every topic below is covered on this site in the same plain language as everything else, including the ones people find hardest to search for.
What this stage is actually like
This is the age band where body changes become visible to other people, and where the pressure to look a certain way really starts. That pressure is not a health matter, and treating it as one is how people end up doing harmful things to their bodies.
Start here
Three articles to read first
Chosen because each one tends to raise the next question, rather than because they are the most read.
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The menstrual cycle
The menstrual cycle is the whole monthly process, not just the bleeding. It runs from the first day of one period to the day before the next, usually…
13-15 7 min read
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HIV and AIDS
HIV is a virus that affects the immune system. With regular treatment, people with HIV can live a normal lifespan and the virus can be suppressed to…
16-19 9 min read
What's covered
Everything in this pathway
Every item below is also reachable from its topic, because a pathway is a route in, not a wall.
- Typical timing and individual variation Who decides when, and why yours may differ. Read
- Voice changes Why it happens, why it cracks, and when it settles. Read
- Body hair and grooming Shaving, trimming and avoiding irritation and ingrown hairs. In writing
- Menstrual cramps Why they hurt, why they can be agonising, and what to do. Read
- PMS Physical and emotional symptoms, and what genuinely helps. Read
- Erections, semen and wet dreams What is normal, and what is worth asking about. In writing
- Body image and comparison Why comparison feels so strong, and other options. In writing
- Attraction and crushes What attraction is, and what to do with a feeling. In writing
- Online safety Privacy, image pressure, and what to do if something goes wrong. In writing
- Hygiene myths What is made up, what is true, and why the difference matters. In writing
- Symptoms worth a doctor's appointment How to tell a normal variation from something to check. In writing
7 items are marked "in writing". We would rather label a gap than publish a placeholder and let you think a question has been answered.
Library
Every article written for ages 13-15
38 articles, listed alphabetically.
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Asking a doctor about development
You can ask a doctor about any part of your body or development, and you will not be the first person of your age they have seen. Appointments are…
13-15 6 min read
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Breast development
Breast development is usually the first physical sign of puberty for people whose breasts will develop, and it typically takes two to five years. It…
10-12 6 min read
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Burning or pain when you pass urine
Burning when you pass urine is usually a urinary tract infection, but chlamydia, gonorrhoea and genital irritation can cause the same feeling. It is…
13-15 5 min read
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Chlamydia
Chlamydia is a common bacterial infection that often causes no symptoms at all. It is easily tested for with a swab or urine sample and cured with a…
16-19 7 min read
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Consent, coercion and healthy relationships
Consent is a free, informed, ongoing yes. Coercion is getting someone to say yes without those conditions — which is far more common than physical…
16-19 8 min read
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Emergency, same-day or routine care?
Emergency means contact your local emergency number now. Same-day means be seen today. Routine means book an appointment. The distinction that…
13-15 7 min read
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Endometriosis
Endometriosis is a long-term condition where tissue similar to the uterine lining grows elsewhere in the body, causing pain, particularly with…
16-19 7 min read
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Genital herpes and oral herpes
Herpes is caused by two viruses, HSV-1 and HSV-2, and it is extremely common — most adults carry one of them. It often causes no symptoms at all…
16-19 7 min read
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Getting tested for STIs
STI testing is routine, quick and usually painless. Most infections have a test, and many can be self-collected. You do not need to be in a…
16-19 7 min read
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Gonorrhoea
Gonorrhoea is a bacterial infection that frequently causes no symptoms, particularly in people with a vagina. It is tested with a swab and treated…
16-19 6 min read
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Growth spurts
A growth spurt is a period where you grow faster than usual, usually in the middle of puberty. It is uneven — hands, feet, head, limbs and trunk grow…
10-12 5 min read
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Headaches
Most headaches are tension-type or migraine, and neither is dangerous — but a few patterns are serious. The pattern matters more than the severity: a…
13-15 6 min read
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Hepatitis B
Hepatitis B is a virus that infects the liver. It spreads through blood and certain body fluids — including sexual contact, shared needles and from…
16-19 6 min read
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HIV and AIDS
HIV is a virus that affects the immune system. With regular treatment, people with HIV can live a normal lifespan and the virus can be suppressed to…
16-19 9 min read
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Hormones and mood
Hormones contribute to mood changes, but they are not the whole explanation. Puberty also brings sleep disruption, stress, social change and identity…
13-15 6 min read
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Human papillomavirus (HPV)
HPV is an extremely common virus that most sexually active people acquire at some point. Most infections clear on their own; persistent infection…
16-19 8 min read
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Irregular periods
A cycle between 21 and 35 days counts as regular, and cycles can change from month to month in the same person. Irregular outside that range is…
16-19 6 min read
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Menstrual cramps
Cramping comes from prostaglandins making your uterus contract. Heat and anti-inflammatory painkillers help most people. Pain severe enough to stop…
13-15 7 min read
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Pelvic inflammatory disease (PID)
PID is an infection of the pelvic organs, usually spreading upward from the cervix. It often causes little or no pain, which is exactly what makes it…
16-19 6 min read
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Period products: pads, tampons, cups and liners
Pads go outside the body, tampons and cups go inside. Tampons are the only product linked to a rare but serious infection, and their risk is managed…
10-12 8 min read
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Personal boundaries and consent
Consent means choosing to do something freely, and being able to stop choosing at any time. A boundary is a line you get to set and change. Silence…
13-15 8 min read
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PMS and PMT
PMS is a cluster of symptoms in the week before a period that ease when bleeding starts. It is real and it is hormonal, not imagined. It affects a…
13-15 6 min read
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Polycystic ovary syndrome (PCOS)
PCOS is a common long-term condition affecting how the ovaries work, causing irregular or absent periods, and often acne, increased body hair and…
16-19 7 min read
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Sudden testicular pain
Sudden severe testicular pain needs emergency medical care immediately, not observation. It can be caused by testicular torsion, where the blood…
13-15 5 min read
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Syphilis
Syphilis is a bacterial infection that spreads through sexual contact and, less commonly, through shared needles or from a pregnant parent to a baby…
16-19 6 min read
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Testicle and penis development
Testicular enlargement is usually the first physical sign of puberty for people with testes, typically somewhere between age 9 and 14. The scrotum…
10-12 6 min read
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Testicular lump or swelling
Most testicular lumps and swellings are benign — cysts, varicoceles, hydroceles or infection. But a hard lump that feels different from the other…
13-15 5 min read
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The body changes you might notice first
The earliest changes are usually skin and body smell, then body hair, then growth and breast or testicular development — but the order varies a lot…
10-12 5 min read
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The menstrual cycle
The menstrual cycle is the whole monthly process, not just the bleeding. It runs from the first day of one period to the day before the next, usually…
13-15 7 min read
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Typical timing and individual variation
Puberty commonly starts somewhere between about age 8 and 14, and it takes several years to complete. The range is wide because bodies are built…
13-15 6 min read
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Urinary tract infections (UTIs)
A UTI is a bacterial infection of the urinary system. Burning when you pee and needing to go more often are the classic symptoms. It is common, it is…
13-15 6 min read
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Vaginal discharge
Clear or white discharge is normal and keeps the vagina healthy. It changes with hormones and the cycle, and often increases before ovulation and…
13-15 7 min read
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Voice changes
Your voice deepens because your larynx grows during puberty, which lengthens and thickens the vocal cords. It often happens in steps rather than…
13-15 4 min read
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Weight changes and body proportions
During puberty your body changes shape before it changes weight. Shoulders widen, hips narrow or widen, limbs lengthen and your centre of gravity…
13-15 5 min read
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What hormones are
Hormones are chemical messengers made by glands and carried in the blood to act elsewhere in the body. During puberty their levels change…
13-15 6 min read
-
What puberty is
Puberty is the time your body starts responding to sex hormones, which changes how you look, how you feel and how your body works. It is gradual, it…
10-12 5 min read
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Why puberty happens
Puberty happens because your brain starts telling your ovaries or testes to make hormones, and those hormones change how your body works. The whole…
13-15 6 min read
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Your first period
Your first period usually starts as a small amount of blood that can look brown or pink rather than bright red, and it may be irregular for the first…
10-12 7 min read
Context
What is different at this age
- Puberty is usually well underway, and may already be close to finished.
- Your body is no longer private in the way it was — that is about other people's behaviour, not about you.
- You may be having your first sexual experiences, and you deserve real information, not rumour.
- Online is now often your first source of health information, which means misinformation matters more here than anywhere else.
Question you would rather not ask anyone?
Ask it here. No account, no name, nothing sent anywhere, and no judgement about what you are finding out about.