Joint pain, medically referred to as arthralgia, is a common complaint that can result from a wide variety of underlying conditions. It may affect a single joint (monoarthritis) or multiple joints (polyarthritis) and can occur suddenly or develop gradually over time. Joint pain can significantly impair mobility and quality of life and may be a sign of both short-term inflammation or chronic disease.
Causes
Joint pain can be caused by:
- Inflammatory conditions such as rheumatoid arthritis, gout, psoriatic arthritis, or lupus.
- Degenerative conditions such as osteoarthritis.
- Infectious arthritis from bacteria or viruses.
- Trauma or injury including ligament tears or fractures.
- Overuse or repetitive strain.
- Autoimmune disorders where the immune system attacks joint tissue.
- Less commonly, malignancy or metastatic disease.
Pathophysiology
The pathophysiology of joint pain depends on the underlying cause. In inflammatory conditions, the synovial membrane becomes inflamed, leading to swelling, heat, and pain due to immune cell activity. In osteoarthritis, there is a breakdown of cartilage that cushions joints, causing bones to rub together. Gout involves deposition of uric acid crystals in the joint, causing acute inflammation. Infection can lead to rapid joint destruction if not promptly treated.
Signs and Symptoms
- Pain in one or more joints
- Swelling or puffiness around the joint
- Redness and warmth over the joint
- Stiffness, especially in the morning or after inactivity
- Reduced range of motion
- Clicking or grinding sounds in some cases (crepitus)
Risk Factors
- Ageing (increased risk of osteoarthritis)
- Previous joint injury or surgery
- Family history of joint diseases.
- Obesity, increasing stress on joints.
- Infections, especially in immunocompromised individuals.
- Autoimmune disorders
- Occupational or sports-related repetitive movements.
Investigation
- Blood tests: Inflammatory markers (CRP, ESR), rheumatoid factor (RF), anti-CCP, uric acid levels.
- Joint aspiration (arthrocentesis): To assess for infection, crystals, or inflammation.
- X-rays: For joint space narrowing, osteophytes, or erosion.
- Ultrasound or MRI: To detect soft tissue damage or synovitis.
- Autoimmune screening if autoimmune disease is suspected (ANA, ENA panel).
Management
1. Non-Pharmacological Management
- Lifestyle changes: Weight loss, exercise, and joint protection techniques.
- Physiotherapy: To improve strength and flexibility.
- Hot/cold compresses for pain relief.
- Assistive devices such as braces or walking aids.
- Patient education and self-management programmes as advised by NICE.
2. Pharmacological Management
- Paracetamol and NSAIDs (e.g., ibuprofen) for mild to moderate pain.
- Topical NSAIDs (e.g., diclofenac gel) particularly for osteoarthritis.
- Corticosteroids: Oral or intra-articular injections for inflammation.
- Disease-modifying antirheumatic drugs (DMARDs) such as methotrexate for autoimmune arthritis.
- Biologic therapies (e.g., TNF inhibitors) for severe cases under specialist guidance.
3. Surgical Management
- Joint aspiration or washout in septic arthritis.
- Arthroscopy for repair or removal of damaged tissue.
- Joint replacement surgery (e.g., hip or knee arthroplasty) in end-stage osteoarthritis.
- Joint fusion (arthrodesis) for severe pain in small joints.
Complications
- Chronic pain and disability
- Joint deformities
- Reduced mobility and loss of function.
- Dependency on painkillers.
- Psychological effects like depression or anxiety.
- If untreated, some causes (e.g., septic arthritis, RA) can lead to joint destruction.
References
- NICE Clinical Knowledge Summaries: Joint Pain (non-traumatic) in adults
- NICE NG100: Rheumatoid arthritis in adults: management
- Royal College of Physicians: Management of inflammatory arthritis
- NHS Inform: Joint pain overview
- General Medical Council (GMC): Good Clinical Practice standards