A contusion (bruise) happens when a blow to your body doesn't break the skin but does break blood vessels beneath the skin. Blood leaking from the broken vessels causes redness and swelling.

Carbon monoxide is a deadly gas you can't see or smell. Breathing in even small amounts can make you sick. Large amounts can be fatal. Know the signs and symptoms.

Electricity, chemicals, steam, very hot water, and fire can all cause serious burns. The care you receive for burns will depend on the type and severity of your injury. Many burns can be treated in an outpatient setting. If a burn needs inpatient treatment, it should be performed in a burn center. Very severe burns need treatment in a burn center.

A blunt injury to your abdomen can be very serious. It's important to get medical care right away, even if you feel OK. Here's what you need to know.

In most cases, a black eye is a minor injury and can be treated at home. But there are times when you should get medical care right away.

Learn all about tick bites, including removing a tick, common symptoms of tick-borne diseases, and when to get medical help after a bite.

Snakebites are often harmless, but a few can be deadly. Even nonpoisonous bites may sometimes cause an infection or allergic reaction. That's why getting treatment right away is vital. Read on to learn more.

Human bites can be more serious than animal bites because they often become infected. Many severe human bites occur during fights when a fist strikes someone's teeth. These bites may damage tissue deep in the hand. Children may bite each other during play or fights.

You're most likely to come in contact with biting or stinging marine life when you're swimming or wading. Learn how to get care if that occurs.

Marijuana can cause many health problems. And it may affect how well you learn, think, and remember. If you or a loved one has a problem with marijuana, tell someone you trust. That's the first step in getting help.