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Shock occurs when the body's supply of oxygen decreases. First aid can slow the progression of this life-threatening condition until emergency medical care is available.

It's important to know how to help someone who is choking. This sheet can help.

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

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

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.

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.

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.

Treatment may help slow the progress of diabetic retinopathy. Your treatment plan depends on your condition. You may need frequent exams to watch for changes. You may also need laser treatment and other procedures. Here's what you need to know.