It is called a silent disease because there are often no symptoms of bone loss until the bones become so weak that a sudden strain, bump, or fall causes a fracture.
فقد انكسرت اثنتان من الفقرات القَطَنية في اسفل ظهرها ،‏ ما ادى الى قصر قامتها ٥ سنتيمترات .‏