What's the Endocrine System? The endocrine system is made up of glands that make hormones. Hormones are the body's chemical messengers. They carry information and instructions from one set of cells to ...

Coughing is a healthy reflex that helps clear the airways. A severe cough or one that lasts more than a week requires a medical checkup. But many coughs are caused by a virus that just needs to run ...

Allergic reactions can be triggered by foods, medicines, pets, insect stings, pollen, and other things. Most allergic reactions aren't serious. But severe reactions can be life-threatening and need ...

What Is the Digestive System? The digestive system breaks down the food we eat into tiny parts to give us fuel and the nutrients we need to live. As food breaks down, we get amino acids from protein, ...

What Is Lactose Intolerance? People who have lactose intolerance (say: LAK-tose in-TAHL-er-ents) have trouble digesting (say: dye-JES-ting) lactose, a type of sugar found in milk and other dairy foods ...

Now that you don’t have to be in a booster seat anymore, there are some things to know about staying safe in cars. There’s also stuff you can do to stay safe when you ride the bus — and get on and off ...

Doctors use certain milestones to tell if a toddler is developing as expected. There's a wide range of what's considered normal, so some children may gain skills earlier or later than others. Toddlers ...

What Is a Blood Test? By taking and testing a small sample of a person’s blood, doctors can check for many kinds of diseases and conditions. Blood tests help doctors check how the body’s organs are ...

It's normal to feel moody or sad at times. But with depression, a sad or bad mood lasts for weeks, months, or even longer. Depression affects more than a person's mood. It can affect the way they act, ...

What Is a Breath-Holding Spell? A breath holding spell is when a child holds their breath, usually after being angry, frustrated, startled, or in pain. Sometimes the breath holding leads to the child ...

When your child has diabetes, there’s a lot to talk about — especially at first. All Feelings Are OK It’s normal for someone who learns they have diabetes to have lots of different feelings. Some kids ...

What Are Heavy Metals? Heavy metals are elements that are found in soil, water, and the air we breathe. Plants take up these metals as they grow and can end up in the food we eat. Our bodies need some ...