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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.

Helpful information on treating poisonous bites and swallowed poisons.

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

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.

Be prepared. Know what to do for heat exposure.

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

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.

As you age, you are more likely to get flashes and floaters in your vision. Here is an explanation of what these are and when to get medical care.

Most often, seeing a few flashes and floaters is normal. Some people may notice them for a while after eye surgery. Most flashes and floaters need no treatment. But sometimes they can be signs of a serious eye problem.