People with celiac disease can't eat gluten, which is found in many everyday foods, such as bread. Find out more by reading this article for kids.

Kids who have allergies also might have a breathing problem called asthma. Find out more in this article for kids.

Babies sometimes have an allergic reaction to eggs. If that happens, they can't eat eggs for a while. But the good news is that most kids outgrow this allergy by age 5.

Struggling with strawberries? Petrified of peanuts? Sorry you ate shellfish? Maybe you have a food allergy. Find out more in this article for kids.

Hives are red, itchy blotches that can appear because of an allergic reaction. Find out more in this article for kids.

Is coconut a nut? And if so, should you watch out if you're allergic to nuts? Find out more in this article for kids.

Kids with lactose intolerance have trouble digesting a type of sugar found in milk and other dairy foods. But by making smart choices, they can eat delicious foods without feeling sick.

During an allergic reaction, your body's immune system goes into overdrive. Find out more in this article for kids.

A growing number of kids are allergic to nuts and peanuts. Find out more about this problem and how allergic kids can stay healthy.

You might not have allergies, but what if your friends do? Find out the answer to a reader's hairy question!

Asthma means breathing problems. Find out what's going on in the lungs and how to stay healthy, if you have it.

Asthma means a person has breathing problems. Find out how Alexis handles her asthma and still stays active.

A kid who has asthma might have an asthma attack (or flare-up). Find out more in this article for kids.

Some kids are born without enough pigment to protect their skin and eyes. Find out more in this article for kids.

Cleft lip and cleft palate are birth defects - problems that happen while a baby is still growing inside his or her mother. Find out more in this article for kids.

What's up with Down syndrome? Find out in this article for kids.

Emily was adopted from Russia, where she was born with a type of dwarfism. In this video, she talks about how she handles the challenge of being smaller than most people.

Marfan syndrome is a disorder that affects the body's connective tissue. This causes problems in many systems of the body, but especially the heart, eyes, and bones.

Inside your spine is the spinal cord, which is like a closed tube made up of nerves. Spina bifida can occur when there is an opening in the cord.

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.

If a kid has an intellectual disability, it means that he or she learns and develops more slowly than other kids.

Lots of kids wet the bed. Find out more in this article for kids.

Kidneys are about the size of your fist and shaped like beans. What happens when this important pair of organs doesn't work well? Find out in this article for kids.

You probably don't think much about urinating, or peeing. But what if it starts to sting? Find out more in this article for kids.

Have you ever heard the word dialysis and wondered what it was? Find out in this article just for kids.

What does it mean when a kid has anemia? Learn about anemia, why kids get it, and how it's treated in our article for kids.

If a person has hemophilia, his blood doesn't clot as it should. What does that mean? Find out in this article for kids.

Sickle cell anemia gets its name because a person's red blood cells turn from a doughnut shape into a curved sickle shape. What's a sickle look like?

Blood transfusions can save lives. But how do they work? Find out in this article.

Kids can get a kind of arthritis that causes joint pain. Find out more in this article for kids.

Your spine, or backbone, curves slightly forward as it runs up your back. For someone with kyphosis, the spine is curved too much, causing discomfort or trouble breathing.

Some injuries will heal best if a cast is used. Find out how they work and how to take care of them in this article for kids.

Guillain-Barré syndrome (GBS) is a rare medical condition that affects a person's immune system and nerves.

Some people have an autoimmune disorder called lupus. Find out more in this article for kids.

Muscular dystrophy is a disease in which muscles of the body get weaker and weaker and may slowly stop working. Learn more about it in this article for kids.

Some kids have problems with their legs and feet. Find out more in this article for kids.

The word scoliosis means a curve in the spine. You may know someone with scoliosis - read our article for kids to find out more.

Inside your spine is the spinal cord, which is like a closed tube made up of nerves. Spina bifida can occur when there is an opening in the cord.

Autism makes it hard for kids to learn and communicate. Find out more in this article for kids.

Bell's palsy weakens or paralyzes one side of a person's face, but it usually goes away. Find out more in this article for kids.

Check out this article to learn what cerebral palsy is, what causes it, what life is like for kids with this condition, and more.

It comes from a Greek word meaning "to hold or seize," and seizures are what happen to people with epilepsy. Learn more about epilepsy in this article written just for kids.

Guillain-Barré syndrome (GBS) is a rare medical condition that affects a person's immune system and nerves.

Can someone in a wheelchair march with the high school band? Yes, with a little help from his friends.

You have memories, but how do they form and stay in your brain? Find out in this article for kids.

Meningitis is a serious illness that affects the membranes surrounding the brain and spinal cord. Find out more in this article for kids.

Inside your spine is the spinal cord, which is like a closed tube made up of nerves. Spina bifida can occur when there is an opening in the cord.

Tourette syndrome is a condition that causes tics -- movements or sounds that are repeated over and over. Learn more about Tourette syndrome in this article for kids.

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.

Bell's palsy is a condition that causes problems with the nerves in a person's face.

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

Cancer is a serious illness that needs special treatment. Find out more about how kids can cope with cancer.

Diabetes means a problem with insulin, an important hormone in the body. Find out how children with diabetes can stay healthy and do the normal stuff kids like to do.

Kids who have diabetes don't have to do it alone. Grace gets help and support from her family.

Diabetes means a problem with insulin, an important hormone in the body. Find out how children with diabetes can stay healthy and do the normal stuff kids like to do.

Everyone grows and matures differently. Usually, this is totally normal. A growth disorder, however, means that a kid has abnormal growth - for example, growing a lot slower or a lot faster than other kids the same age.

Do you know just how important the thyroid is? It helps you grow and affects your energy level. With a little care, the thyroid and the conditions it may cause can be easily managed. Read this article to find out more!

An atrial septal defect is an opening in the wall between two parts of the heart that lets oxygen-rich blood from one side mix with oxygen-poor blood on the other side. Read more about ASDs in this article for kids.

Cystic fibrosis affects the lungs and makes it hard to breathe. Find out more in this article for kids.

Kids who have cystic fibrosis need to eat extra calories to stay healthy. Find out why in this article for kids.

Everyone's heart makes sounds, but some people have hearts that make more noise than others. Usually, however, these heart murmurs don't mean anything is wrong. Find out more about these mysterious murmurs.

Noah had two heart surgeries when he was a baby. Now he's 9 and going strong! Read about him in this article for kids.

This article helps kids understand how incentive spirometry works. An incentive spirometer is a way for kids to do breathing exercises to help them get better after some types of surgery or when they have an illness.

Mitral valve prolapse is a heart problem that usually isn't much to worry about. Learn more about it here.

Your heart beats and sends oxygen throughout your entire body. Find out how it works and how heart problems can be fixed.

Kids who have whooping cough make a "whoop" sound when they cough. Find out more in this article for kids.

Kids with cystic fibrosis have bodies that make thick, sticky mucus. This causes problems in their lungs and their digestive tracts.

Your heart beats and sends blood all around your body. Find out more about the heart, from A to Z, in this glossary.

What's an appendix and why do they sometimes need to be removed? Find out in this article for kids.

Anyone can get athlete's foot. Find out how to avoid this itchy skin condition in this article for kids.

Bell's palsy weakens or paralyzes one side of a person's face, but it usually goes away. Find out more in this article for kids.

Botulism is a rare kind of food poisoning. Find out more in this article for kids.

Cellulitis is a serious infection that can be mistaken for a bruise, scrape, or insect bite. Find out more in this article for kids.

Chickenpox is a virus that causes red, itchy bumps. Find out more in this article for kids.

You may have had a cold sore, but what are they exactly? Find out in this article for kids.

E. coli is a common type of bacteria that can make you pretty sick. Read more in this article for kids.

Ebola is a dangerous virus that can cause people to get very sick or even die. Find out more in this article for kids.

What do you think of when you hear the word fungus? Do you think of mushrooms? A mushroom is one type of fungus, but fungus is also a type of germ that lives on all of us.

It's sneaky, it's silent, and it can permanently harm your liver. Read this article for more information on hepatitis.

Get the facts on HIV and AIDS in this article just for kids.

Impetigo is a strange-sounding word that might be new to you. It's an infection of the skin caused by bacteria. Read this article to learn more about it.

Jock itch is a pretty common skin infection of the groin and upper thighs. It is usually affects teens, but sometimes kids can get it. Find out what it is and how to prevent it in this article for kids.

The best way to prevent Lyme disease is to prevent tick bites. Find out more about this disease and how to keep those ticks away.

Meningitis is a serious illness that affects the membranes surrounding the brain and spinal cord. Find out more in this article for kids.

Pinkeye is the most common eye problem kids can have. It causes redness, itching, inflammation, and pus to collect in the eyes.

It's gross to think about but did you know that tiny worm eggs could be under your fingernails? Learn more about how to protect yourself from getting pinworms.

Pneumonia is an infection in a person's lungs. Find out more in this article for kids.

You may have heard of rabies, but how do animals get it? And, more importantly, how can people and animals avoid it? Find out in this article for kids.

Ringworm isn't a worm at all - it's the name for a type of fungal skin infection. The good news is that ringworm is easy to treat.

Anyone can get scabies - little babies, adults, kids like you - the mites aren't picky. Read on to find out more about how to prevent these unwanted invaders!

Strep throat gives you a sore throat and makes it hard to swallow. Find out more in this article for kids.

A middle ear infection happens when germs like bacteria and viruses get in your middle ear and cause trouble. Read this article to find out more.

You may have heard about anthrax in the news. But what exactly is anthrax, and should you be concerned about it? Find out all you need to know.

You might be wondering what smallpox is and whether you or anyone you know is at risk for getting it. Get the answers to your questions in this article.

Chickenpox can make you itch like crazy. Find out why in this article for kids.

Kissing is just one of the ways that someone can spread mononucleosis. Most people who get mono are between the ages of 15 and 25, but younger kids can get it, too.

What exactly is the West Nile virus? And what do mosquitoes have to do with it? Find out in this article!

Kids who have whooping cough make a "whoop" sound when they cough. Find out more in this article for kids.

Bell's palsy is a condition that causes problems with the nerves in a person's face.

ADHD is a medical condition that makes it harder for kids to stay focused. Kids with ADHD can also be more fidgety than other kids their age. This article for kids explains how doctors decide a kid has ADHD and what they can do about it.

Medicine can help kids who have attention deficit hyperactivity disorder, or ADHD. Find out more in this article.

Have you ever been afraid? Everyone gets scared sometimes. Find out more about fear in this article for kids.

Someone who has bipolar disorder goes back and forth between feeling full of energy and ideas to feeling very low. Read more about it in this article for kids.

Dyslexia is a problem that makes it difficult for a kid to read. With some help and a lot of hard work, a kid who has dyslexia can learn to read and spell.

Eating too little or deliberately throwing up after eating are two serious kinds of eating disorders. Find out more in this article for kids.

Having a learning disability doesn't mean you can't learn. The trick will be figuring out how you learn best.

Mindfulness can help kids do better at everything from paying attention and focusing on schoolwork to getting on better with other people. This article for kids has tips on building this important skill.

Being mindful helps people do better in just about every part of life. These exercises are for kids who want to practice and build good mindfulness skills.

Someone might say you're obsessed with soccer or something else that you really like, but when someone has a true obsession, it isn't any fun. Find out more about obsessive-compulsive disorder in this article for kids.

Stealing can be a big problem, but it can also be solved with some help and understanding. Read our article to find out more.

Therapy is part of the treatment for most kids who have ADHD. This article is for kids who want to find out how therapy helps children with ADHD.

Kids who can't see, or can't see well, learn to live without using their eyes. To learn more about visual impairment and what causes it, read our 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?"

Did you know you can scratch your cornea? Find out how it can happen and be amazed at how quickly it usually heals.

When a kid has trouble hearing, an audiologist can help. That's a person specially trained to understand how hearing works and to help kids who don't hear normally.

What does it mean to be blind? Julia explains how she learns and plays even though she has vision problems.

Did you ever hear someone say, "I lost my voice"? Did you think: "What did you do with it?" The person might have laryngitis.

The eardrum in your ear can get a hole in it. Find out how in this article for kids.

Strabismus is when someone's eyes don't look straight ahead. It might look as if the person has one crossed eye. Find out more in this article for kids.

Do you or does someone you know ever have a hard time getting words out? Get the whole story on stuttering and other speech problems in this article for kids.

Oh my, is that a stye? Find out what to do about these eyelid bumps.

Being color blind doesn't mean the world is in black and white. Watch this video and find out more.

Hearing loss happens when there is a problem with the ear, nerves connected to the ear, or the part of the brain that controls hearing. Someone who has hearing loss may be able to hear some sounds or nothing at all. To learn more, read this article for kids.

Evan was born with a port wine stain. Find out what it is in this article for kids.

An abscess is a pocket of pus that forms in the body. Find out how to spot a skin abscess and when to call the doctor.

If you're almost a teen, chances are pretty good that you have some acne. About 8 in 10 preteens and teens have acne, along with many adults.

Acne - also called pimples or zits - is a perfectly normal part of growing up. Learn more in this article for kids.

Some kids are born without enough pigment to protect their skin and eyes. Find out more in this article for kids.

Anyone can get athlete's foot. Find out how to avoid this itchy skin condition in this article for kids.

Ouch! What are blisters, calluses, and corns? Find out in this article for kids.

Cellulitis is a serious infection that can be mistaken for a bruise, scrape, or insect bite. Find out more in this article for kids.

Everybody has dry skin once in a while, but eczema is more than just that. If your skin is dry, itchy, red, sore, and scaly, you may have eczema. Learn more about this uncomfortable condition and what you can to do stop itching!

What do you think of when you hear the word fungus? Do you think of mushrooms? A mushroom is one type of fungus, but fungus is also a type of germ that lives on all of us.

Every day, you lose about 50 to 100 hairs. But when someone has hair loss, the hairs may not grow back for a while.

Hives are red, itchy blotches that can appear because of an allergic reaction. Find out more in this article for kids.

Impetigo is a strange-sounding word that might be new to you. It's an infection of the skin caused by bacteria. Read this article to learn more about it.

Jock itch is a pretty common skin infection of the groin and upper thighs. It is usually affects teens, but sometimes kids can get it. Find out what it is and how to prevent it in this article for kids.

Poison ivy can give you a nasty rash. Find out more about it - and the other plants that can make you itch - in this article for kids.

Learn about rashes in a flash. Check out our article just for kids!

Ringworm isn't a worm at all - it's the name for a type of fungal skin infection. The good news is that ringworm is easy to treat.

Anyone can get scabies - little babies, adults, kids like you - the mites aren't picky. Read on to find out more about how to prevent these unwanted invaders!

You may be young, but you probably already have a scar or two. But why did you get them? How can you prevent them? Find out in this article written just for kids!

Psoriasis causes red, flaky skin. Find out more about this chronic skin condition.

Having the "stomach flu" usually means spending a lot of time in the bathroom. Find out more in this article for kids.

What's an appendix and why do they sometimes need to be removed? Find out in this article for kids.

Botulism is a rare kind of food poisoning. Find out more in this article for kids.

People with celiac disease can't eat gluten, which is found in many everyday foods, such as bread. Find out more by reading this article for kids.

If you aren't pooping like usual, you could be constipated.

E. coli is a common type of bacteria that can make you pretty sick. Read more in this article for kids.

Did you ever eat something that made you feel ooky? It might have been food poisoning.

Be on guard for GERD! Find out about this digestive problem that causes heartburn and other problems in many people.

Got tummy troubles? Indigestion is a common condition that many people - even kids - have at one time or another. Find out more in this article for kids.

It's normal to get a stomachache once in a while, but some kids have something more serious called inflammatory bowel disease (IBD). Find out more about it.

Having irritable bowel syndrome can make a kid feel awful. The good news is that kids can take steps to feel better.

Salmonellosis is an illness caused by a bacteria found in raw food, soil, water and the bowel movements of some animals, including reptiles. Find out how to prevent this illness.

You've probably heard people talk about ulcers, but what are they? Find out in this article for kids.

Braces are expensive, so what do you do if your family can't afford the cost? Find out in this article for kids.

Just what are adenoids? And why do kids sometimes have to get their adenoids removed? Get the answers here.

How does your breath smell? Find out how to keep it smelling sweet in this article for kids.

Braces are a fact of life for many kids. Find out how they work and how to take care of them.

Have you ever been rankled by a canker sore? If you have, you know that these small mouth sores can cause major pain.

You may have had a cold sore, but what are they exactly? Find out in this article for kids.

An orthodontist prevents and treats mouth, teeth, and jaw problems using braces, retainers, and other devices.

Are you a kid who snores? Find out why some people are such noisy sleepers in this article for kids.

Bruxism is another word for grinding your teeth or clenching your jaw. It usually happens without you knowing you're doing it, but it can be noisy at night. Find out more in this article for kids.

Retainers are really common. In fact, most kids have to wear a retainer for at least a little while after getting their braces taken off. Find out more.

If your tonsils get infected, it can make your throat feel very sore. Find out more in this article for kids.

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