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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.

Glaucoma is an eye disease that can cause blindness. It often begins when pressure builds up in the eye. If caught early, it can often be controlled. But it often has no symptoms, so you need regular eye exams.

Treatment can prevent or limit vision loss from glaucoma. The goal of treatment is to control glaucoma by lowering eye pressure. Medicines and procedures may also help.

Diabetic retinopathy is a disease that can lead to blurry, distorted vision or even blindness. It happens when diabetes harms blood vessels on the retina at the back of the eye.