An X-ray of Jim Marks’ spinal column told quite a story about a lifetime of activity. Tell-tale signs of arthritis and natural deterioration also explained the pain and the instability in his legs.

When a person experiences sudden, sharp back pain, they may say that they "threw out" their back. But what does that really mean?

Alzheimer’s disease affects about five million Americans, most of whom are over 65. About one in 10 people over 65 and nearly half of people over 85 have Alzheimer’s, according to the Alzheimer’s Association. It is the most common cause of dementia, a condition in which an individual’s cognitive functions deteriorate.