Asthma is a chronic lung disease. It causes asthma attacks, which make your airways inflamed and narrowed, and your lungs get less air. Learn about treatments. READ MORE
Asbestos is the name of a group of minerals with thin fibers. Breathing high levels of asbestos can lead to mesothelioma or lung cancer. Read more. READ MORE
Artificial limbs, or prosthetics, can allow a person to do activities they might not be able to do otherwise. Learn more about artificial limbs. READ MORE
Arthritis can cause pain, swelling, and stiffness in and around the joints. Learn about the different types of arthritis and how they can affect you. READ MORE
Arteriovenous malformations (AVMs) are defects in your arteries, veins, and capillaries. They are common in the brain and spine. Find out more. READ MORE
Arsenic can be in food, soil, and water. Low levels will probably not hurt you, but higher levels can cause problems. Learn more about arsenic. READ MORE
If you have an arrhythmia, or irregular heartbeat, your heart may beat too quickly, too slowly, or with an irregular rhythm. Learn about causes and treatments. READ MORE