What is Alzheimer's Disease? Alzheimer's disease (AD) is a degenerative brain disorder that manifests as a progressive deterioration of memory and mental function—a state of mind commonly referred to as dementia. In the United States, 5 percent of the population over...

What is Asthma? Asthma is an allergic disorder characterized by spasms of the bronchi (the airway tubes); swelling of the mucus lining of the lungs; and excessive production of a thick, viscous mucus. The major concern with asthma is that it can lead to respiratory...