A genetic condition is one that happens when a gene changes. Some genetic conditions can be inherited (passed from parents to their children). Genes are sections of DNA (deoxyribonucleic acid) that ...

Kids really shouldn't have coffee or tea. The main reason is because these drinks often have caffeine (say: KA-feen). Caffeine is an addictive drug, and it can be harmful for kids and teens. Even ...

I always get an erection almost every morning when I wake up. Is this normal? Yes, it's completely normal to have an erection when waking up in the morning. In fact, guys often have about 3 to 5 ...

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 heavy metals (like ...

How Does Air Enter the Respiratory System? Air enters the respiratory system through the nose or the mouth. If it goes in the nostrils (also called nares), the air is warmed and humidified. Tiny hairs ...

We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Now ...

Spiders are arachnids (as are ticks, mites, and scorpions), not insects. Spiders rarely bite people. When they do, it’s usually in self-defense because they’re being crushed by a human. Usually, their ...

Nighttime feedings may be over, but you might still be struggling to get your toddler to sleep. Learn how to instill good sleep habits early so your toddler can sleep well.

As you've probably noticed, puberty comes with all kinds of changes — including the way your body looks and even the way you might think it smells. These changes are a normal part of becoming a woman, ...

Most blood tests take only a few minutes. They’re done at some doctor’s offices, and at community labs, diagnostic centers, and hospitals. A doctor, nurse, or phlebotomist (fleh-BOT-eh-mist, someone ...

infection in the urinary tract irritation or injury of the genital area stones (small masses of minerals) in the urinary tract Urinary tract infections (UTIs) are the most common cause of pain during ...

Vomiting can be caused by many things, most commonly gastroenteritis (the "stomach flu"). Vomiting (throwing up) can cause kids to lose fluids, salts, and minerals, so it's important to make sure ...