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Find out how much you know about asthma basics with this quiz.

This test measures the amount of carbon dioxide in your blood. Normally, carbon dioxide in your bloodstream causes no problems, but if you have far too much or too little of it, you may have a disease or a medical emergency.

Learn about how to care for yourself when you have sickle cell anemia, from lifestyle changes to preventive care.

The only safe sex is no sex, most doctors say. But certain precautions and safe behaviors can reduce a person's risk of contracting a sexually transmitted disease.

Choosing the right type and amount of proteins you eat is important when you have chronic kidney disease. It can affect your overall health and kidney function.

Does your child have trouble sitting still or paying attention? You may have been told that ADHD (attention deficit hyperactivity disorder) may be the cause.

When you have diabetes, you are at greater risk for periodontal disease. This disease is an infection of the gums and tissues supporting the teeth. Any periodontal disease you may develop can be more severe and harder to control. Preventing or controlling periodontal disease needs ongoing care.

Vaccines for COVID-19 are available. Here's what you need to know about them.

Laser therapy can be used to cut a very tiny area to remove very small cancers without damaging surrounding tissue. Lasers also are used to apply heat to tumors to shrink them. They are sometimes used with medicines that are activated by laser light to kill cancer cells.