1. Osteoporosis : Causes, incidence, and risk factors  (Trust Mark: Doctor-Reviewed)
Osteoporosis is the most common type of bone disease. An estimated 10 million Americans have osteoporosis, as well as another 18 million who have low bone mass, or osteopenia, which may eventually lead to osteoporosis if not treated. Researchers e...• Reviewer: Elizabeth H. Holt, MD, PhD, Assistant Professor of Medicine, Section of Endocrinology and Metabolism, Yale University. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.

2. Osteoporosis  (Trust Mark: Doctor-Reviewed)
The word osteoporosis literally means "porous bones." It occurs when bones lose an excessive amount of their protein and mineral content, particularly calcium . Over time, bone mass, and therefore bone strength, is decreased. As a result, bones be...• Author: Crystal Kaczkowski MSc