Fibrous Dysplasia is a bone disorder where normal bone is replaced with fibrous tissue, leading to weakened bones and deformities. This condition can affect one bone, known as monostotic fibrous dysplasia, or multiple bones, referred to as polyostotic fibrous dysplasia. It often occurs during childhood or adolescence and can cause pain, fractures, and changes in bone shape. The exact cause of fibrous dysplasia is linked to a mutation in the GNAS gene, which affects bone development. While there is no cure, treatment options may include medications for pain management and surgery to correct deformities or fractures. Regular monitoring is essential for managing the condition.