Musculoskeletal Pain UK: Types, Causes & Conditions

A clinically reviewed conditions guide to musculoskeletal pain — back pain, osteoarthritis, sprains, tendinopathy, rheumatoid arthritis, and neck and shoulder pain. Causes, symptoms, and treatment options.

What Is Musculoskeletal Pain?

Musculoskeletal pain describes any pain originating from the structures that support and move the body: bones, joints, muscles, tendons, ligaments, and bursa. It is not a single diagnosis but a broad category encompassing dozens of distinct conditions — from a sprained ankle to rheumatoid arthritis to fibromyalgia.

MSK pain is the most frequent reason adults consult a GP in the UK. Most acute MSK pain is nociceptive in nature — driven by tissue damage or inflammation at the site of pathology — which means it responds well to anti-inflammatory treatment. Chronic MSK pain often develops additional components, including central sensitisation, that require a broader management approach.

Types of MSK Pain

Common MSK Conditions

Back pain

Back pain is the leading cause of disability in the UK and one of the most common reasons for GP consultations and time off work. The vast majority (>95%) is non-specific mechanical back pain — with no identifiable structural pathology. Most acute episodes resolve within 4–6 weeks. NSAIDs and paracetamol provide effective short-term relief; remaining active and continuing normal activities is strongly advised. Prolonged bed rest is actively harmful.

Osteoarthritis (OA)

Osteoarthritis is the most common form of arthritis, affecting around 10 million people in the UK. It involves progressive loss of cartilage within synovial joints, resulting in pain, stiffness, reduced range of movement, and joint swelling. The knee, hip, hand, and spine are most commonly affected. OA is not simply “wear and tear” — it involves active inflammatory processes. NSAIDs are effective for symptomatic flares; for accessible joints such as the knee, topical diclofenac gel is NICE first-line, with lower systemic side effects than oral NSAIDs.

Rheumatoid arthritis (RA)

Rheumatoid arthritis is an autoimmune inflammatory arthritis affecting around 400,000 people in the UK. It causes symmetrical joint pain, swelling, and morning stiffness, typically affecting the hands, wrists, and feet first. Unlike osteoarthritis, RA is a systemic disease driven by autoimmune inflammation. Management is led by rheumatology and uses disease-modifying antirheumatic drugs (DMARDs). NSAIDs provide symptomatic relief during flares but do not modify the disease course.

Sprains and strains

A sprain is a ligament injury (overstretching or tearing); a strain is a muscle or tendon injury. Both produce immediate pain, swelling, and reduced function. Acute management follows PRICE principles (Protection, Rest, Ice, Compression, Elevation). NSAIDs, started promptly, significantly reduce pain and swelling. Most resolve within 6–8 weeks; significant tears may require physiotherapy or surgical review.

Tendinopathy (tendinitis / tendinosis)

Tendinopathy describes pain and dysfunction in a tendon, most commonly the Achilles, patellar, rotator cuff, and lateral epicondyle (tennis elbow). Acute tendinitis has an inflammatory component that responds to NSAIDs; chronic tendinosis involves structural tendon degeneration rather than inflammation, and responds better to eccentric loading exercises and physiotherapy than to anti-inflammatories.

Neck and shoulder pain

Neck pain is extremely common — around two thirds of people experience significant neck pain at some point. Most is mechanical and self-limiting. Shoulder pain is most commonly caused by rotator cuff disorders (rotator cuff tears, impingement syndrome) and frozen shoulder (adhesive capsulitis). NSAIDs reduce pain and improve function in the short term; physiotherapy is important for shoulder conditions particularly.

Causes and Risk Factors

Symptoms by Condition Type

• Acute soft tissue injury — immediate pain, swelling, bruising, loss of function at the injury site
• Osteoarthritis — deep aching joint pain worse with activity and at end of day; morning stiffness lasting less than 30 minutes; joint crepitus; bony enlargement
• Rheumatoid arthritis — symmetrical joint pain and swelling; prolonged morning stiffness (>30–60 minutes); systemic features (fatigue, low-grade fever); hands and wrists typically first affected
• Mechanical back pain — lower back pain worsened by movement, improved by rest; may radiate to buttocks; rarely below knee without nerve involvement
• Sciatica / radiculopathy — shooting or burning pain radiating down the leg below the knee; often with numbness or tingling in a dermatomal distribution
• Tendinopathy — localised tendon pain worse with specific loading activities; stiffness after rest; often a painful arc of movement

Acute vs Chronic MSK Pain

Acute MSK pain resolves with appropriate management in most cases. The transition to chronicity is influenced less by the extent of initial tissue damage than by psychosocial factors — fear of movement, catastrophising, low recovery expectations, and work-related factors are stronger predictors of who develops chronic back pain than MRI findings. Early, active rehabilitation and avoiding unnecessary rest are the most evidence-based acute MSK interventions.

Diagnosis

Most MSK conditions are diagnosed clinically through history and physical examination. Investigations are indicated when: the history suggests systemic inflammatory disease (RA, ankylosing spondylitis); red flag features are present; the response to treatment is unexpectedly poor; or structural pathology is suspected that would change management.

Blood tests are not required for mechanical MSK pain but are used when inflammatory arthritis or infection is suspected (ESR, CRP, RF, anti-CCP). X-ray and MRI findings should be interpreted in clinical context — degenerative changes are extremely common on imaging in people with no symptoms, and imaging results alone should not drive management decisions.

Treatment Overview

When to Seek Help

• MSK pain not improving after 6–8 weeks with appropriate self-management
• Pain significantly affecting work, mobility, or quality of life
• Signs of systemic inflammatory arthritis — symmetrical joint swelling, prolonged morning stiffness, fatigue
• Joint becoming unstable, locking, or giving way
• Suspected tendon rupture (sudden severe pain with immediate loss of function)