You love your video games, but how much is too much? Find out in this article for kids.

Loud music can cause temporary and permanent hearing loss. Learn how to protect your ears so you won't be saying, "Huh? What did you say?"

Do you wish you could change something about your body? It’s normal to think about it sometimes. Here are tips for kids on feeling good about your body.

Kissing is just one of the ways that someone can spread mononucleosis. Most people who get mono are teens or young adults, but kids can get it too.

Someone important to your friend has died. What do you do?

Without taste buds, life would have less flavor. Find out why in this article for kids.

Sometimes called abs, these are the muscles in front of your abdomen, the area below your chest and above your belly button.

The airways in your lungs are like tubes or straws.

If you sneeze a lot because you're allergic to something, could these things help?

These awesome medicines attack bacteria that make you sick.

Antihistamines are medicines that block allergy symptoms.

Your body has a highway system all its own that sends blood to and from your body parts.

If your skin is oilier than normal, you might want to use an astringent.

If you're feeling crummy, it's probably because nasty bacteria or some other germs have gotten into your body and made you sick.

Beta cells make insulin, a hormone that controls the level of glucose (a type of sugar) in the blood.

Blood banks collect and store blood, which healthy people donate.

Every person has a blood type.

These tubes, or airways, let air in and out of your lungs, so you can breathe.

Canker sores are small, painful sores found in and around the mouth.

Like proteins and fats, carbohydrates are one of the three main components of food.

Cells are the smallest building block of all living things, and you have trillions of them in your body.

Your body is made up of billions of cells, which are too small to see without a strong microscope.

Controller medicine keeps the airways in the lungs open and clear so kids with asthma can breathe.

Decongestants are medicines that keep your nose from being stuffy.

Disinfectants are germ busters!

Dust mites are teeny, tiny bugs that live in household dust.

You'll need a mirror to do it, but take a good look at your ear.

A first-degree burn is one that only hurts the top layer of skin.

Do you have freckles or know someone who does? Find out what freckles are in this article.

You know they can hurt you, but what are these invisible creatures? Find out in this article for kids.

You've heard of glands, but what are they? Find out in this article for kids.

Hormones are special chemicals your body makes to help it do certain things - like grow up!

Sometimes the stuff in your pee – like calcium – can make little crystals that build up to become hard kidney stones.

Many people with asthma need to take medicine every day to control their asthma.

A migraine is a really bad kind of headache that can make you feel dizzy or even sick to your stomach.

Palpitations can make it feel like your heart is racing or fluttering, or that your heart has skipped a beat.

Quick-relief medicines are a type of asthma medicine that works quickly.

Reflexes help protect your body. Find out what they are in this article for kids.

Retractions are a sign someone is working hard to breathe.

A second-degree burn is one that hurts the top two layers of skin.

Sulfites are food preservatives that can cause breathing problems in some people with asthma.

A third-degree burn is one that damages all the layers of the skin and the tissue beneath the skin.

With asthma, a trigger is anything that brings on asthma symptoms, such as coughing, wheezing, and trouble breathing.

White blood cells are part of the germ-fighting immune system.

Wonder why hiccups happen? Find out more in this article for kids.

Alignment means to bring into line.

Your immune system fights infections and illnesses. But sometimes the immune system makes a mistake and attacks part of the body. This is called autoimmunity.

There's a good reason your parent tells you to cover your mouth when you sneeze or cough!

The word diagnosis is a fancy name for how doctors figure out what's making you sick.

A dislocation is when one or more bones at a joint moves out of place.

A coma can be difficult to understand, especially because it may look like the person is just sleeping. Find out what a coma is and how people recover from them.

Blood is made up of different parts, such as red blood cells, white blood cells, and platelets.

Why does one kid have green eyes while another kid's eyes are brown? It's all in the genes! Find out how genes work, what happens when there are problems with genes, and more.

How well do your lungs function? In other words, how well are you breathing?

Bone marrow is a thick, spongy kind of jelly inside your bones.

Bronchoconstriction affects the airways in a person's lungs.

Bruxism is the word for grinding your teeth, usually during sleep.

Cancer is a disease that happens when the body makes cells that are not normal.

Cellulitis is a skin infection caused by bacteria entering the skin through a cut or scrape.

Cerebral palsy is a condition that affects the brain and how it talks to the muscles.

This word means wax.

Chemotherapy is the use of special medicines to treat cancer.

A coxsackievirus is one of a group of viruses or germs that live in the digestive tract and can make you sick.

DNA is the genetic information inside the cells of the body that helps make people who they are.

Some people have asthma symptoms (such as coughing, wheezing, or trouble breathing) only when they're doing sports or being active.

GERD, or gastroesophageal reflux disease, is when the stomach's contents flow back up into the esophagus

People with hemophilia have blood that doesn't clot the way it should. That means that they bruise and bleed easily.

Histamine is a substance in the body that's released during an allergic reaction.

Hydrocephalus happens when the fluid that cushions the brain builds up inside the head.

Kawasaki disease is pretty rare. Kids who have it may have a fever for up to 2 weeks.

The meninges cover and protect the brain and spinal cord. Meningitis happens when the meninges swell or get irritated.

When someone has multiple sclerosis, their nerves don't send signals to the brain the way they should.

Otalgia means ear pain or an earache.

Peritonitis is when the tissue that covers the inside wall of abdomen gets swollen and irritated, usually due to an infection.

Also known as gray matter, this term describes the brain's outer layer.

If you just sneezed, something was probably irritating or tickling the inside of your nose. Learn more about why you sneeze in this article for kids.

It's normal for family members to disagree once in a while. Learn how keep your cool during an argument.

Sometimes, when doctors are not sure what's wrong with a part of your body, they might decide to do a test called a biopsy.

Birthmarks, also known as hemangiomas, get their name for one reason: They are marks on the skin of a lot of newborn babies! Find out more about birthmarks in this article for kids.

People with acne may have different types of bumps on their skin.

Have you ever had a bruise that turned a bunch of different colors before it went away? Find out why in this article for kids.

This kind of doctor knows all about the heart and how it works.

Cavities are small holes in your teeth that need to be filled. Find out what causes tooth decay and how dentists handle it.

A cleft lip is a split in the upper lip that some babies are born with.

A cleft palate is a split in the roof of the mouth that some babies are born with.

A cough is a reflex that helps your body clear your throat and lungs.

Actually, CT scans have nothing to do with cats, except that when people talk about them, they usually say "CAT scan" instead of "CT scan."

A cyst is a sac filled with air, liquid, or pus that can happen in different parts of the body.

A special doctor called a dermatologist knows a lot about skin.

A dietitian knows a lot about food and healthy eating.

You've banged your elbow and it feels tingly and strange. Find out why in this article for kids.

A microscope is a very powerful magnifying glass.

This type of doctor deals with hormones, those special chemical substances that make things happen all over the body (especially during puberty).

Your skin has many tiny holes called pores.

A spacer makes it easier to use an inhaler.

A spirometer is an instrument that measures how well your lungs are working.

Here's why doctors sometimes have kids pee in a cup.

Viruses are a type of germ. They're very tiny, and when they get inside your body, they can make you sick.

People with acne may have different types of bumps on their skin.

A yeast infection is a skin infection caused by a fungus called candida. It can cause white spots in the mouth or an itchy, red rash.

An addiction is an urge to do something that is hard to control or stop.

Aerobic activity is any kind of movement that makes your muscles use oxygen.

Where's your Adam's apple? Do you even have one? Find out in this article for kids.

When something keeps the air from moving in and out of the airways in your lungs, it's called an airway obstruction.

Allergists are special doctors who help people who are allergic to things like animals, grass, pollen, dust, and even foods.

Achoo! Many things can trigger allergies, like pollen, certain animals, foods, or a bee sting.

Lots of stuff goes more smoothly when you have a plan - and that includes dealing with asthma.

When a person has a lot of trouble with wheezing, coughing, or shortness of breath, it's called an asthma flare-up, or attack.

Doctors use electroencephalograms to figure out what's going on in your brain.

X-rays are special pictures of the inside of your body.

Anesthesia is medicine that doctors give to make people feel comfortable when they're having surgery, stitches, or other things that might be painful.

All warm-blooded animals shed tiny flakes from their skin. This is called dander.

If you take a good look at your eye, you might barely see your cornea, the clear outer covering of the eye.

Have you ever seen someone whose ear looks bumpy and lumpy? It could be cauliflower ear! Find out more in this article for kids.

Chances are, you've heard about cholesterol a lot lately, but you might be wondering what it is. Here's your chance to get the lowdown in our article just for kids.

Congestion happens when your nose gets stuffy and makes it hard to breathe.

Sometimes your bowel movements — you know, the stuff inside your intestines we call poop — might be hard and dry.

Dandruff is flakes of dead skin on your head that come loose all the time, but especially when you scratch your head, brush your hair, or pull a shirt over your head.

It's normal to feel sad sometimes, but if you feel that way for a long time, and you never feel happy, it's called depression.

If you've ever had a bad time in the bathroom, then you know what this is.

Herpes zoster, also called shingles, causes a rash with blisters on the body and is very painful.

Pneumonia is an infection of the lungs, usually caused by viruses or bacteria.

Pollen is a fine powder produced by certain plants.

Protein builds, maintains, and replaces the tissues in your body. You can get it from yummy foods like eggs, nuts, beans, fish, meat, and milk.

Ever get the hiccups? Don't worry — it's just your diaphragm doing something different!

It's normal to be a little worried or anxious about getting your period. Find out more in this article for kids.

What does it mean when your eyes water? It's not the same as crying - or is it?

Zap! You touched the doorknob and got a shock. Why does that happen? Find out in this article for kids.

A belly button, also called a navel, is something everyone in the world has! You can find out why in our article for kids.

When your body is injured in some way, your nerves send messages to your brain about what's going on. Your brain then makes you feel pain. Read our pain-free article for kids.

Sleep is vital for giving your body a rest and allowing it to prepare for the next day. This article about sleep will teach you why your brain needs to spend time in bed getting zzzz's!

Washing your hands is the best way to stop germs from spreading. Learn all about the best way to wash your hands in this article for kids.

If you yawn in class, you'll probably notice a few other people will start yawning, too. Why is that?

Is your foot asleep? Find out why in this article for kids.

You may have heard the old joke: If your nose is running and your feet smell, you must be upside down! But did you ever wonder why your nose runs?

What happens when you spend a long time in the water? Your skin gets wrinkly! Find out why in this article for kids.

Just about everyone has had one of these on their knee. Find out how scabs help you heal.

Gulp. You accidentally swallowed your gum. Will it really stay in your stomach for years?

They're more than just gross. Boogers have a job to do. Find out what it is in this article for kids.

All people fart sometimes, whether they live in France, the Fiji islands, or Fresno, California! Learn more about what gives gas its sass in our article for kids about farts.

Why do our ears make earwax? Find out in this article for kids.

Did you ever toss your cookies? That means throw up, or puke. It's gross, but just about everyone has done it. Find out more in this article for kids.

Saliva, also known as spit, is a clear liquid that's made in your mouth 24 hours a day, every day. If you want to know more about spit and what it's made of, check out this article for kids.

Everybody sweats. Find out why perspiration happens in this article for kids.

Your hard-working feet sometimes start stinking. Find out why in this article for kids.

A burp - sometimes also called a belch - is nothing but gas. Find out more about burping and what to do if it happens to you in this article for kids.