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Health condition · Clinically reviewed

Paget's disease of bone, disorganised remodelling - and how it's treated.

Often silent and found by chance - but when it causes pain or deformity, modern bisphosphonate treatment can effectively settle the disease.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE CKS, the National Osteoporosis Society and peer-reviewed sources you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK guidance on bisphosphonate therapy, monitoring and when specialist referral is warranted.

Key facts

Paget's disease of bone at a glance.

The essentials, in plain English - what it is, where it strikes, and how it's managed in the UK today.

  • What it is

    A chronic bone disease causing disorganised remodelling - excessive breakdown followed by disorganised new bone formation.

  • The result

    Bone that is enlarged, misshapen and structurally weaker than normal, despite often being denser on X-ray.

  • Who it affects

    Most common in older adults, rare under 55 - often picked up incidentally rather than through symptoms.

  • Where it strikes

    Commonly the pelvis, spine, skull and long bones such as the femur and tibia - one or several sites at once.

  • Key marker

    Raised serum alkaline phosphatase with normal calcium and phosphate is the classic biochemical signature.

  • Treatment

    Many cases need no treatment. Bisphosphonates are first-line when symptomatic, and can normalise bone turnover.

Why this guide matters

Often silent, sometimes serious.

Paget's disease of bone is common enough to matter and quiet enough to be missed. The three points below shape everything else on this page.

  • Most cases need no treatment

    If it is not causing pain, deformity or complications, watchful monitoring alone is often the right approach.

  • Alkaline phosphatase tells the story

    A raised level with normal calcium and phosphate is the classic clue that points doctors towards the diagnosis.

  • Bisphosphonates change the picture

    For symptomatic disease, they can effectively normalise bone turnover and settle pain - a genuine treatment, not just a painkiller.

How the diagnosis is made

From an incidental finding to a clear plan.

The steps a UK GP or specialist will normally follow, in order - so you know what to expect and why.

  1. 01

    Noticing

    Incidental finding or symptoms

    Often picked up on an X-ray taken for another reason, or on a routine blood test showing raised alkaline phosphatase.

  2. 02

    Noticing

    History and examination

    Bone pain, deformity, hearing changes or a family history of Paget's disease are all explored alongside a general musculoskeletal exam.

  3. 03

    Confirming

    Serum alkaline phosphatase

    The key biochemical marker - typically raised while calcium and phosphate remain normal, distinguishing it from other bone diseases.

  4. 04

    Confirming

    Plain X-ray

    Shows the characteristic appearance of Paget's disease - cortical thickening, bone enlargement and a coarsened trabecular pattern.

  5. 05

    Confirming

    Isotope bone scan

    Maps the full extent of disease across the skeleton, since more than one bone is often affected.

  6. 06

    Planning

    Bone biopsy if uncertain

    Rarely needed - reserved for diagnostic doubt or where sarcomatous change is suspected.

  7. 07

    Planning

    Specialist referral if complex

    Rheumatology or endocrinology input for extensive disease, complications, or before major orthopaedic surgery.

Typical timeline: bloods and imaging usually settle the diagnosis within a few weeks.

Symptoms

What Paget's disease of bone actually looks like.

From no symptoms at all through to deep bone pain, deformity and, rarely, nerve involvement. And the features that mean it's time to escalate.

  • Often silent

    Many people have no symptoms at all - the condition is found incidentally on an X-ray or a blood test done for another reason.

  • Deep, aching bone pain

    A dull ache in the affected bone, typically worse at rest and at night rather than with activity - unlike most mechanical joint pain.

  • Bowing of long bones

    The femur or tibia can gradually bow outward as weakened, disorganised bone reshapes under everyday load.

  • Skull enlargement

    A gradually increasing hat size is a recognised sign when the skull is involved.

  • Increased fracture risk

    Pagetic bone is structurally weaker despite looking denser, so fractures can occur with relatively minor trauma.

  • Hearing loss

    Skull involvement can affect the inner ear and the nerve pathways for hearing, leading to gradual hearing loss.

  • Nerve compression

    Rarely, overgrown bone in the spine or skull base can press on nerves, causing pain, weakness or numbness.

  • Red flag - Paget's sarcoma

    Very rare malignant transformation - new, worsening pain in a previously stable site needs urgent assessment.

Treatment

How Paget's disease of bone is treated in the UK.

Monitoring where disease is quiet, bisphosphonates where it isn't - plus a plan for complications when they arise.

  • Watchful monitoring

    Many people with asymptomatic Paget's disease need no active treatment - just periodic review of symptoms and alkaline phosphatase.

  • Bisphosphonates

    First-line for symptomatic disease, particularly bone pain - these drugs can effectively normalise bone turnover and reduce activity.

  • Pre-surgical bisphosphonates

    Given before planned orthopaedic surgery to reduce bone turnover and limit bleeding from highly vascular Pagetic bone.

  • Analgesia

    Simple analgesics or NSAIDs for bone pain, used alongside disease-modifying treatment rather than instead of it.

  • Audiology referral

    For assessment and management of hearing loss when skull involvement affects the inner ear or auditory nerve.

  • Orthopaedic surgery

    For fractures, severe deformity or joint damage from disease affecting a weight-bearing bone.

  • Monitoring for complications

    Regular review for fracture, progressive deformity, hearing change or nerve compression as disease activity evolves.

  • Rheumatology or endocrinology

    Specialist referral for extensive, complicated or treatment-resistant disease, or where the diagnosis is uncertain.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP or specialist knows your bones and history and can tell you which parts apply to you. If in doubt, get seen.

  • NICE Clinical Knowledge Summaries (CKS). Paget's disease of bone.

  • National Osteoporosis Society (Royal Osteoporosis Society). Guidance on Paget's disease.

  • National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS). Paget's disease of bone.

  • British Society for Rheumatology. Standards on metabolic bone disease.

Red flags

When Paget's disease needs urgent attention.

Most Paget's disease is quietly manageable in primary care. These are the situations that aren't - and where a specialist opinion is needed.

  • Suspected Paget's sarcoma

    New, worsening or unexplained pain at a known Pagetic site, especially with swelling, is a rare but serious sign of malignant transformation needing urgent referral.

  • Sudden severe bone pain

    Could indicate a fracture through weakened Pagetic bone, even after minor trauma.

  • Progressive hearing loss

    Especially when skull involvement is known - warrants prompt audiology assessment.

  • New neurological symptoms

    Numbness, weakness or altered sensation can signal nerve compression from bone overgrowth, particularly in the spine or skull base.

  • Rapidly increasing deformity

    Fast-progressing bowing or skull enlargement should prompt reassessment of disease activity and treatment.

  • Unexplained rise in alkaline phosphatase

    A marked or accelerating rise can indicate increased disease activity or, rarely, malignant change.

  • Signs of high-output heart failure

    Very extensive disease can rarely increase cardiac workload through highly vascular bone - breathlessness or swelling needs assessment.

  • Pre-operative bone not yet treated

    Undergoing orthopaedic surgery on active Pagetic bone without prior bisphosphonate treatment raises bleeding risk.

Living with it

A manageable condition, with regular check-ins.

Four things that make the biggest difference day to day - watching for new symptoms, staying active safely, supporting bone health and keeping up with review.

A quiet reminder

Quiet disease can stay quiet for years.

Many people live well with Paget's disease of bone for decades with nothing more than periodic monitoring.

  1. 01 Monitor

    Keep track of symptoms

    Note any new bone pain, change in hat size, hearing changes or numbness, and mention them at review appointments.

  2. 02 Move

    Stay active, safely

    Weight-bearing activity supports bone health, but be mindful of fracture risk in affected bones - ask what is safe for you.

  3. 03 Bones

    Support bone health generally

    Adequate calcium and vitamin D intake supports overall bone health alongside any Paget's-specific treatment.

  4. 04 Review

    Attend follow-up reviews

    Periodic alkaline phosphatase checks and clinical review help catch disease flares or complications early.

Frequently asked

Everything we get asked about Paget's disease of bone.

Quick answers on diagnosis, alkaline phosphatase, bisphosphonates and when to worry.

  • What is Paget's disease of bone?

    A chronic condition in which normal bone remodelling becomes disorganised - bone is broken down too quickly and then rebuilt in a disorganised way, leaving it enlarged, misshapen and structurally weaker than normal bone.

  • Who gets Paget's disease of bone?

    It mainly affects older adults and is rare before the age of 55. It commonly involves the pelvis, spine, skull and long bones, and can affect one bone or several at once.

  • How is it usually found?

    Many cases are asymptomatic and are found incidentally - either on an X-ray taken for another reason or through a raised alkaline phosphatase level on a routine blood test.

  • Do I need treatment if I have no symptoms?

    Not necessarily. Many people with asymptomatic Paget's disease need no active treatment, just periodic monitoring. Treatment is generally reserved for bone pain or to prepare bone before surgery.

  • What is the main treatment?

    Bisphosphonates are first-line for symptomatic disease. They can effectively normalise the rate of bone turnover and are also used before orthopaedic surgery to reduce bleeding from highly vascular Pagetic bone.

  • Can Paget's disease of bone become cancerous?

    Malignant transformation to Paget's sarcoma is very rare. It should be suspected if there is new or worsening pain at a previously stable Pagetic site, and this needs urgent specialist assessment.

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