The term 'Brittle Bones' is a common name for the medical condition Osteoporosis, which is characterized by a decrease in bone density and an increased risk of fractures. Osteoporosis is caused by a variety of factors, including age, genetics, lifestyle, and diet. It is most commonly seen in post-menopausal women, but can affect anyone. Treatment for Osteoporosis includes medications, lifestyle changes, and exercise.