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Osteopetrosis is a rare disorder that causes bones to grow abnormally and become too dense. When this happens, bones can break easily.

Osteogenesis imperfecta is a genetic disease, also called brittle bone disease, that causes bones to be weak and break easily.

Fibrous dysplasia happens when a bone is replaced with other tissues. Bones may become weak, oddly shaped, or broken. Learn more about this rare disease.

Osteoporosis is a bone disease that develops when bone mineral density and bone mass decreases, or when the quality or structure of bone changes. This can lead to a decrease in bone strength that can increase the risk of fractures (broken bones).

Paget’s disease of bone is a chronic (long-lasting) disorder that causes bones to grow larger and become weaker than normal. The disease usually affects just one or a few bones.