Pain in the belly area is a common problem for kids. Some complain about it often. Let's learn more about this pain, and when you should talk to a doctor.

This common skin condition is the formation of multiple blemishes on or just beneath the surface of the skin. These blemishes commonly appear on the face, neck, chest, shoulders and back. Acne can affect anyone, but it most commonly affects adolescents and young adults.

This condition is an infection of the adenoids, lumps of spongy lymphoid tissue at the very back of the nose that are positioned behind and above the uvula. Chronic or recurrent infections can cause the adenoids to swell and enlarge, blocking the airway.

Allergies are a common problem for children. But what is an allergy, exactly? Well, it's an immune system problem. We say your child has an allergy when their immune system reacts to something that's normally harmless. We call these things "allergens."

This is a severe reaction to an allergen. It happens when your immune system floods your bloodstream with chemicals that are supposed to protect you. But these chemicals overwhelm your body. You can go into shock. This is life-threatening.

Every child feels worried or afraid sometimes. Learning to cope with emotions is a normal part of growth and development. But sometimes, worries and fears don't go away. They can get worse. They can begin to take over your child's life. This is what we call "anxiety."

Asthma is a chronic lung disease. It is common in children. Children with asthma have trouble breathing. This happens when their airways become irritated and swollen. Many children who have asthma begin showing symptoms by age five.

This is a common disorder of childhood. It affects behavior. It can cause problems with social interactions. It can cause problems with learning. A person who has ADHD may have these problems throughout life.

This complex disorder is commonly called "autism." It affects the way people understand the world around them. It affects the way they think and feel. It affects the way they interact with others.

Peeing while sleeping is a problem for many children. It can be embarrassing for kids. And it can sometimes be frustrating for parents.

This is an infection in the smallest passageways of the lungs. It causes the passageways to swell and fill with mucus. Bronchiolitis is most common in children under the age of two. Some children only have mild symptoms. But it can be serious.

This is an inflammation of the bronchi. They are the large airways in the lungs. For most children, bronchitis is a mild condition that goes away on its own.

This group of disorders involves the brain. It affects movement, balance and posture. It can cause other serious issues.

This is a viral infection. It usually results in an itchy rash and mild sickness that lasts for five to 10 days. This virus spreads easily among children. In the past, contracting chickenpox was a routine part of childhood for most people. But a vaccine has made infections much less common.

This is a speech disorder. It involves the brain and the muscles that control speech. With this disorder, it's hard to make the muscle movements needed for speaking.

An ear infection is a buildup of germs behind the eardrum, in the part of the ear called the "middle ear." For some infants and young children, ear infections are a continuing problem. They can come back again and again. We call these "chronic" ear infections.

When a healthy baby regularly cries intensely and for a long time, we call that "colic." It happens a lot, often in the evening. You can't figure out the reason for the crying, and nothing seems to soothe your baby. Colic isn't harmful for your baby, but it is stressful and upsetting for you.

We've all experienced the sneezing, coughing, sore throat and fever of a common cold. But what, exactly, is a cold? And how do you fight it?

It's a pain when kids have to deal with the sneezing, coughing, sore throat and fever of a common cold. But what, exactly, is a cold? What causes it, and how do we treat it?

This is a serious brain injury. It happens when the brain violently bumps back and forth in the skull. A concussion can affect the way the brain functions. It can cause permanent problems.

This is a swelling or an inflammation of the conjunctiva, a thin, clear layer of tissue in the eye. The conjunctiva covers the white part of your eye, and also the inner side of your eyelids.

This is a swelling or inflammation of the conjunctiva. That's the thin membrane that lines the eye. Conjunctivitis is common in children of all ages.

This is when your child has trouble pooping. They may not do it often enough, and it may be hard for them to poop. Constipation is common in children of all ages. In most cases, it doesn't turn into a serious problem.

It's hard to listen to your child cough. It's a constant reminder that something's wrong, and you want to help them get relief. Let's take a few minutes to learn more about coughing.

This is an infection caused by one of the coxsackieviruses. These viruses infect the digestive system. Infections are most common in children. Hand, foot and mouth disease is one example of a disease caused by a coxsackievirus. There are others, too.

This upper airway infection is most common in young children. It causes a barking cough and makes breathing difficult.

This is a disease that affects your mucus and sweat glands. It causes the mucus your body produces to be thick and sticky. In your lungs, sticky mucus can clog your airways. This makes it hard for you to breathe. It also provides a place for bacteria to grow. That can lead to frequent lung infections.

Every child feels sad or even hopeless sometimes. Learning to cope with emotions is a normal part of growth and development. But sometimes, negative feelings begin to take over a child's life. Your child may lose interest in things they use to enjoy. This is "depression."

This disease, once called "juvenile diabetes," is a problem with the way your body converts food to energy. It happens when your immune system attacks and destroys islet cells in the pancreas. These cells produce insulin, a hormone used to process blood glucose.

This common skin irritation affects a baby's diaper area. Let's learn more about why it happens and how to care for it.

Diarrhea is the passage of frequent, loose, or liquid stools. In an infant or child, it can be very serious. If it lasts for more than a day, the child is at risk of dehydration. It is important for parents to be able to recognize and treat dehydration.

This happens when a young child with a fever starts to convulse. It may be scary for parents, but it usually won't harm your child.

A pregnant woman who drinks alcohol can harm her developing baby. Fetal alcohol syndrome includes a range of problems seen in these babies. It can lead to lifelong issues.

When your child has a fever, it can be scary. Should you be worried? Should you call the doctor? It's not always easy to know what to do. So let's take a moment to learn about fevers in children.

This is a viral infection that often causes a rash on the cheeks. It's most common in children, but the virus can infect adults, too.

Your child is sick. Do they have a common cold? Or could it be something more serious, like the flu? Here are some symptoms to watch out for, and when to get medical care.

This is an inherited genetic disorder. It can cause a wide range of mind and body problems. This syndrome affects both males and females, but it is more common and usually more severe in males.

This is a pain many kids feel in their legs. We call it "growing pains," but the pain isn't really linked to growing. Kids can feel it even in times when they aren't growing very much.

This is a common viral infection. It most often affects kids under age 10. It spreads easily from person to person.

If your scalp itches, you may have a lice infestation. Lice are tiny insects that like to live in the hair on your head. They bite your scalp and feed on your blood. And they can spread from one person to another.

This is a heart problem that is present at birth. In a heart with this syndrome, the left side doesn't fully develop. The underdeveloped left side can't pump enough blood out to the body.

This common viral infection is sometimes called "the kissing disease." It can leave an infected person tired for weeks or months. Mononucleosis is most often seen in adolescents and in young adults.

This is an infectious disease commonly called "the flu." It targets your respiratory system. For some people, an influenza infection can be very serious.

This viral lung infection is more dangerous than a common cold, especially for young children. It can lead to hospitalization. It can be life-threatening.

Are insect stings dangerous for your child? Bees, wasps, hornets and yellow jackets all cause painful stings. So do fire ants. Here's what you need to know.

Lead is a toxic metal. If you breathe it in or swallow small amounts of it over time, it builds up in your body. Its very dangerous for children's growing bodies and brains. Unfortunately, the signs of lead poisoning may go unnoticed until the damage is done.

This is a cancer of the blood cells. Commonly it affects white blood cells. It can also affect red blood cells and platelets.

This is a disease you get from a virus. Measles isn't common. That's because most of us are vaccinated as children. But when an unvaccinated person is exposed to it, they can be infected. They can spread it to others.

This is a swelling of thin membranes called the "meninges." These three layers of tissue cover and protect your brain and your spinal cord. Meningitis is a serious condition. It can be life threatening.

This is a disease you get from a virus. Mumps isn't common. That's because most of us are vaccinated as children. But when an unvaccinated person is exposed to it, they can be infected. They can spread it to others.

Nosebleeds are a common problem for some kids. Some come without warning, and they may worry kids and parents. But usually, nosebleeds aren't a serious issue. Let's learn why they happen and how to deal with them.

This is a type of injury that causes knee pain in children. It's an inflammation of a growth plate in the tibia. Growth plates are places where new bone tissue forms. They are found in the long bones of growing children. But growth plates are weaker than the surrounding bone. That makes them easier to injure.

This is an infection of the lungs. It makes breathing difficult. And it can be very serious for young children.

This condition is a common congenital anomaly that results in extra fingers or thumbs. Polydactyly can affect one or both hands, and can result in one or more extra digits. Polydactyly can also affect the feet, resulting in extra toes.

This is a virus that infects the lungs and airways. For most people an infection isn't dangerous. But for babies, the elderly, and for people who have a weakened immune system, infections can be severe.

This is an infection that causes red, circular rashes on your skin. Ringworm of the body can affect the skin anywhere except your scalp, your groin, the soles of your feet and your palms. But ringworm of the body is just one of many forms of ringworm infections. There are other, closely-related infections such as jock itch and athlete's foot that can affect other parts.

This condition is an abnormal curvature of the spine. It most often develops in early childhood, just before a child reaches puberty.

Your young child wants to be by your side all the time. They get scared and upset when you need to leave them, even for a brief time. We call this "separation anxiety." Let's learn more about it, and how to manage it.

This isn't a true disease, it's a painful heel condition that affects growing children. It's an inflammation of the growth plate in the heel bone (called the "calcaneus"). Growth plates are places where new bone forms as bones grow and lengthen.

This brain injury happens when a baby is shaken forcefully. Babies don't have strong neck muscles. Shaking a baby causes their head to whip back and forth. Their brain slams against the inside of their skull. This can cause bruising and bleeding. Their brain may swell.

This condition is an inflammation and swelling of your sinuses. These are hollow, air-filled cavities in your skull. They open into your nasal passages. Sinusitis can be a painful condition. For some people, it can become a chronic problem.

This is an inflammation and swelling of your child's sinuses. What are sinuses? They're a system of spaces lined with mucous membranes. They drain into the nose's nasal passages. There are four types of sinuses, but they don't all develop at the same time. We're born with two, near the nose and cheeks. The other two form by the end of adolescence.

Sleep apnea is an interruption of breathing during sleep. Though we often think of sleep apnea as a problem experienced by adults, it is also common in children. Disruptive sleep is not healthy for a child. It can lead to problems when a child is awake.

This is an infection of your child's digestive system. It's not really a flu, but we call it that. It makes your child feel very sick. It can be dangerous for infants and for people who have a weak immune system.

This is a bacterial infection of your throat. It can pass easily from person to person. It is most common in children, but adults can also contract this infection.

This is a bacterial infection of the throat. It spreads easily from person to person. It's most common in children, but adults can get it, too.

SIDS is a name we give to some infant deaths. These are deaths that are unexpected. They are deaths for which we can't find a cause, even after careful study. Although we don't fully understand SIDS, you can do things to help prevent it.

When your baby is about six to ten months old, their teeth begin to break through their gums. This can be uncomfortable for your baby. Let's take a moment to learn how you can help the teething process go smoothly.

Young children aren't always good at controlling their emotions. Sometimes, strong emotions lead to a meltdown. We call this a "temper tantrum."

This is a serious illness also known as "lockjaw." It's a bacterial infection that causes muscles all over your body to tighten and spasm. It's a medical emergency.

This heart problem is present at birth. It's a combination of four heart defects that change the way blood flows through the heart and to the lungs. As a result, blood can't get all the oxygen it needs to supply the body's cells.

This condition is an infection of the tonsils (the large lymph glands at the back of the throat). Tonsils normally help protect against infection, but they can become overwhelmed by viruses or bacteria. Tonsillitis occurs most often in children and rarely in adults.

This condition is a reversal of the two major arteries that carry blood away from the heart. These are the aorta and the pulmonary artery. In a heart with TGA, these arteries switch places during the heart's formation. They connect to the wrong chambers of the heart.

This is an infection of any part of the urinary system. That's the system that collects and removes urine from the body.

Viral infections are common in children of all ages. But what are viruses, exactly? And what do I need to know to keep my child safe?

Wheezing is a problem with the airways. It's a high-pitched whistling sound you can hear when your child breathes. Or, it may be so quiet that a doctor needs a stethoscope to hear it. Wheezing can be scary for parents.

This is an infection of the lining of your airways. It is highly contagious. It is most common in young children who have not been fully vaccinated and in people who have not received booster shots.

A crying baby is one of the most challenging parts of parenthood. Your baby may cry often, and at all hours. Let's take a look at why babies cry, and how to soothe them.