Symptoms

Fibrous dysplasia may cause few or no signs and symptoms, particularly if the condition is mild. More severe fibrous dysplasia may cause:

• Bone pain, usually a mild to moderate dull ache
• Swelling
• Bone deformity
• Bone fractures, particularly in the arms or legs
• Curvature of leg bones

Fibrous dysplasia can affect any bone in the body, but the most commonly affected bones include the following:

• Thighbone (femur)
• Shinbone (tibia)
• Upper arm bone (humerus)
• Skull
• Ribs
• Pelvis

Rarely, fibrous dysplasia may be associated with a syndrome that affects the hormone-producing glands of your endocrine system. These abnormalities may include:

• Very early puberty
• Overactive hormone production
• Light brown spots on the skin

Increased bone pain also may be associated with the normal hormonal changes of the menstrual cycle or pregnancy.

When to see a doctor

See your doctor if you or your child develops any of the following:

• Bone pain that increases with weight-bearing activity or doesn't go away with rest
• Bone pain that interrupts sleep
• Difficulty walking or limping
• Unexplained swelling
• Changes in bone shape
• Difference in limb length