Most people who have Paget's disease of bone experience no symptoms. When symptoms do occur, the most common complaint is bone pain. The disease may affect only one or two areas of your body or may be widespread. Your signs and symptoms, if any, will depend on the part of your body that's affected, including:
- Pelvis. Paget's disease of bone in the pelvis can cause hip pain.
- Skull. An overgrowth of bone in the skull can cause hearing loss or headaches.
- Spine. If your spine is affected, nerve roots can become compressed. This can cause pain, tingling and numbness in an arm or leg.
- Leg. As the bones weaken, they may bend — causing you to become bowlegged. Enlarged and misshapen bones in your legs can put extra stress on nearby joints, which may cause wear-and-tear arthritis in your knee or hip.
When to see a doctor
Talk to your doctor if you have:
- Pain in your bones and joints
- Tingling and weakness
- Bone deformities
Even after you've reached your full height, your bones don't stop growing. Bone is living tissue engaged in a continual process of renewal. During this constant process called remodeling, old bone is removed and replaced by new bone. Paget's disease of bone disrupts this process.
Early in the course of the disease, old bone starts breaking down faster than new bone can be built. Over time, your body responds by generating new bone at a faster than normal rate. This rapid remodeling produces bone that's softer and weaker than normal bone, which can lead to bone pain, deformities and fractures.
Scientists haven't identified a cause of Paget's disease of bone, though they have discovered several genes that appear to be linked to the disorder.
Some scientists believe Paget's is related to a viral infection in your bone cells that may be present for many years before problems appear. Hereditary factors seem to influence whether you're susceptible to the disease.
Factors that can increase your risk of Paget's disease of bone include:
- Age. People older than 40 are the most likely to develop Paget's disease of bone.
- Sex. Men are more commonly affected than are women.
- National origin. Paget's disease of bone is more common in England, Scotland, central Europe and Greece — as well as countries settled by European immigrants. It's uncommon in Scandinavia and Asia.
- Family history. If you have a close relative who has Paget's disease of bone, you are much more likely to develop the condition yourself.
In most cases, Paget's disease of bone progresses slowly. The disease can be managed effectively in nearly all people. Possible complications include:
- Fractures. Bones affected by Paget's disease break more easily. Extra blood vessels are created in these deformed bones, so they bleed more during repair surgeries.
- Osteoarthritis. Misshapen bones can increase the amount of stress on nearby joints, which can cause osteoarthritis.
- Heart failure. Unusually extensive Paget's disease may force your heart to work harder to pump blood to the affected areas of your body. In people with pre-existing heart disease, this increased workload can lead to heart failure.
- Bone cancer. Bone cancer occurs in less than 1 percent of people with Paget's disease.