What is multiple sclerosis (MS)? MS is the most common disabling neurologic disease of young people under age 40, affecting approximately 250,000 Americans. It is probably an autoimmune disease, characterized by relapsing and remitting episodes of inflammation in the brain and spinal cord. This inflammation destroys the myelin, which is the insulating sheath around nerve [...]

Define dementia. Dementia is a progressive decline in cognitive and intellectual functions in the presence of a clear sensorium. Dementia implies that the person has lost intellectual function from a baseline state-i.e., he or she was not born mentally retarded (the process is acquired) and is not delirious, lethargic, or otherwise suffering from an impaired [...]