A break in the skin is an open door, inviting dirt and germs to enter your body and cause infection. Follow these instructions to care for a puncture in the skin.

A heart attack is an emergency, but the condition that causes it usually takes years to develop. Over time, fatty substances collect on the walls of the heart's arteries. As these arteries become narrower, it's more likely that one will become fully clogged, causing a heart attack.

Learn what to do, and when to call 911, when someone is having a seizure.

Be prepared. Know what to do for heat exposure.

Intense cold can freeze the water in the body's cells (frostbite). In addition, exposure to cold may cause the body's overall temperature to drop (hypothermia). The result can be death.

A strong blow to the head may cause swelling and bleeding inside the skull. The resulting pressure can injure the brain (concussion).

Information on when to seek medical help and what to do while you wait after someone receives an electrical shock.

Learn how to help when someone is having a limited or severe allergic reaction.

Helpful information on treating poisonous bites and swallowed poisons.

A sprain happens when the ligaments, or fibrous tissue, connecting bones at a joint pulls or tears. Most sprains hurt, and some take even longer than a broken bone to heal. A fracture may happen when a bone is hit with more force than it can bear.