Alzheimer's disease (AD) is the most common form of dementia (see Dementia Overview for more information). The disease is progressive, and the brain degenerates...learn more »
Head injury occurs when an outside force hits the head hard enough to cause the brain to move violently within the skull. This force can cause shaking, twisting...learn more »
Amyotrophic lateral sclerosis (ALS) is a devastating disorder. It affects the part of the nervous system that controls voluntary movements. ALS is sometimes cal...learn more »
Decline in mental processes is a common complication of HIV infection (and many other conditions).
Although the specific symptoms vary from person to pers...learn more »