Bone loss is quiet. It does not usually announce itself with pain, swelling, or a warning sign. For many people, the first clue is a fracture from a fall that should not have broken a bone. That is why osteoporosis prevention belongs earlier in adult life, not only after a scan shows low bone density. Bone is living tissue. It breaks down and rebuilds every day, and the balance between those two processes shifts with age, hormones, nutrition, medications, and activity level.