Oliver Bee RMTRegistered Massage Therapist

Massage therapy · Kitchener–WaterlooPaget's Disease

Whole body

What It Is

Paget's disease of bone is a long-term condition that disrupts the normal cycle of bone renewal, causing bones to become weakened and possibly deformed (NHS, 2023a). It is a fairly common condition in the UK, particularly in older people, and it is rare in people under 50 (NHS, 2023a). Men may be slightly more likely than women to have it (NIAMS, 2022). It can affect any bone in the skeleton, but it commonly affects the pelvis, spine, skull and leg bones (NIAMS, 2022). It can affect one bone or several bones, and it can affect just one part of a bone or the whole bone.

The disease runs in families. Studies have found that between 5 and 40 percent of people with the disease have a family member who has it too (Choi, Sohn and Chung, 2022). You may inherit a genetic fault that makes you much more likely to develop the condition (NHS, 2023a). Researchers think that environmental factors, as well as genetics, play a part, and they are studying whether certain viruses may trigger the disease in people who already have other risk factors (NIAMS, 2022).

The disease is named after the English surgeon Sir James Paget (1814–1899). Normal bones are constantly being renewed, with old bone being removed and new bone being laid down. Two kinds of cells do this: osteoclasts, which absorb old bone, and osteoblasts, which make new bone. In Paget's disease, something goes wrong with the osteoclasts and they absorb bone much faster than usual. The osteoblasts then try to make new bone more quickly, but the new bone is larger and weaker than normal (NHS, 2023a), which leaves it more easily broken.

Often people are unaware that they have the disease, and joint pains may be put down to "arthritis" or "wear and tear" (NIAMS, 2022).

If you or your medical professional suspects this condition, a blood test can check the level of a substance called alkaline phosphatase (ALP). People with Paget's disease often have raised levels of ALP, but some people with the condition have a normal level, and a high level can also be caused by other conditions, so an X-ray or bone scan is also needed to confirm the diagnosis (NHS, 2023c). Normal ranges vary between laboratories; one example range is 40 to 129 IU/L (MedlinePlus, 2025a).

Paget's disease symptoms may include bone or joint pain (often a dull, deep ache that is worse at night), the skin feeling warm over the affected bone, bowing of a limb, and nerve problems such as shooting pain, numbness or tingling. If the skull is affected, it can cause headaches, hearing loss and an increased head size (NHS, 2023b; NIAMS, 2022). Paget's disease can also lead to broken bones, osteoarthritis and, rarely, bone cancer (NHS, 2023e).

Warning signs: call 911 or go to the emergency room at your nearest hospital if you have partial loss of movement in your limbs, or loss of bowel or bladder control (NHS, 2023b).

Paget's Disease Anatomy

The skeletal system is made up of all the joints and bones in the body. Bones are living tissue made up of cells, protein fibres and minerals, and they are constantly being renewed: old bone is removed and replaced with new bone (NHS, 2023a). The skeleton serves as a scaffold, protecting and supporting the soft tissues that make up the rest of the body, and it provides attachment points that allow the muscles to move the joints.

New blood cells are made by the red bone marrow inside the bones. The bones also act as the body's main store of calcium. The skeleton grows throughout childhood and serves as a framework for the rest of the body to grow along with it.

Not a diagnosis — for more information, contact me or another trusted healthcare provider.

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