Rheumatoid arthritis: causes and symptoms

Understanding Rheumatoid Arthritis: Mechanisms and Main Causes

Rheumatoid arthritis (RA) is a chronic autoimmune inflammatory disease that primarily affects the joints. It is a process in which the immune system attacks the body, causing inflammation of the joints and surrounding tissues. This chronic inflammation eventually leads to joint deformities and debilitating pain. The exact causes of rheumatoid arthritis remain unknown, but several factors contribute to its onset:

Genetics: Certain genetic variations increase susceptibility to developing the disease, although this is not a sufficient factor on its own.

• Environmental factors: Smoking is recognized as the most significant risk factor, increasing both the risk of developing and the severity of the disease. Viral infections: Certain viruses may trigger an abnormal immune response, causing joint inflammation in genetically predisposed individuals. Microbiota changes: An imbalance of microorganisms in the mouth, intestines, or lungs, particularly in the context of periodontal disease, could influence the immune system.
• The disease primarily affects the small joints of the hands, wrists, and feet. The inflammation causes swelling, intense pain, and stiffness that typically lasts more than an hour in the morning or after a period of inactivity. Rheumatoid arthritis can also lead to systemic symptoms such as fatigue, mild fever, and loss of appetite. It is important to note that RA can occur at any age, most often between 35 and 50, and affects approximately 0.5% of the world’s population, with a female predominance. Some similar forms can appear in children, known as juvenile idiopathic arthritis, although the progression is often different.
• Discover the main causes and symptoms of rheumatoid arthritis. Understand this chronic inflammatory disease to better recognize its signs and risk factors.
• Our understanding of the underlying immunological mechanisms has evolved significantly in recent years, thanks in particular to advances by pharmaceutical companies such as Sanofi, Pfizer, and Roche. These major players contribute to the development of targeted therapies that act on specific inflammatory mediators. The complexity of rheumatoid arthritis also lies in the variable expression of the disease, both clinically and biologically. Some patients experience flare-ups of varying intensity, interspersed with periods of remission of varying lengths. The progression can be slow or rapid, with a considerable impact on quality of life.

List of risk factors identified in 2025:

Obesity and overweight Family history of autoimmune diseasesUntreated chronic periodontitis Gut microbiome imbalance These factors should prompt increased vigilance, particularly in individuals with several of them. Prevention, although still limited, relies on a healthy lifestyle and reducing aggravating factors such as smoking. Characteristic symptoms of rheumatoid arthritis and early recognitionThe initial signs of rheumatoid arthritis are often subtle, which can delay diagnosis. Understanding the main symptoms is essential for prompt management.

The most common signs include:

• Symmetrical joint pain,
• often affecting the small joints of the hands (fingers, wrists) and feet (toes).
• Prolonged morning stiffness,
• lasting more than an hour, a sign of active inflammation.
• Swelling,

and tenderness of the joints due to synovitis (inflammation of the synovial membrane surrounding the joint).

Chronic fatigue and weakness, frequently felt in the early afternoon.

Moderate fever,

and sometimes loss of appetite leading to weight loss.

• Over time, the joints can become deformed, including with typical shapes such as swan neck deformity or boutonniere deformity of the fingers. Joint mobility decreases, impacting daily activities: it becomes difficult to button a shirt, grasp objects, or walk without pain. In addition to joint problems, rheumatoid arthritis can cause systemic complications:Inflammation of the blood vessels (vasculitis)
• Lung or heart involvement, leading to fatigue and shortness of breath Formation of rheumatoid nodules, hard lumps under the skin often located around the elbows or hands
• Sjögren’s syndrome with dry eyes and mouth Neurological symptoms related to nerve compression (e.g., carpal tunnel syndrome)
• The case of Mrs. Dupont, a 47-year-old patient, clearly illustrates these symptoms: she presented with morning stiffness and widespread joint pain, initially interpreted as temporary fatigue. Her diagnosis was made after several months thanks to a comprehensive evaluation, allowing for the implementation of appropriate treatment that limited the damage. Early recognition of symptoms is crucial. If joint pain persists for more than six weeks, especially if accompanied by prolonged morning stiffness, it is advisable to consult a healthcare professional.
• Diagnostic methods for rheumatoid arthritis: key tests and examinations The diagnosis of rheumatoid arthritis relies on a combination of clinical, laboratory, and radiological criteria.

The physician begins with a thorough physical examination, looking for signs of joint inflammation, bilateral involvement, and the extent of the number of affected joints.

• Blood tests play a crucial role:Testing for rheumatoid factor (present in 70% of cases)Measuring anti-citrullinated peptide (anti-CCP) antibodies, which are highly specific to the disease
• Markers of inflammation such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR)
• Complete blood count to look for anemia of inflammation
• Medical imaging is also used:
• X-rays of the hands, wrists, feet, and other painful joints to detect characteristic bone erosions

Ultrasound to visualize inflammation of the synovium and tendons

Magnetic resonance imaging (MRI) for a more detailed analysis, particularly in complex or early-stage cases

In some cases, a synovial fluid sample may be taken to rule out other causes of joint pain. Early detection of anti-CCP antibodies allows for better prediction of disease severity. For example, in smokers with high anti-CCP levels, the disease course may be more aggressive.

To illustrate, a rheumatology center located in Paris, in collaboration with

AbbVie

• and Novartis [Name of organization] has implemented an automated screening protocol that integrates these different parameters to ensure rapid intervention in less than 6 weeks after the onset of the first symptoms, which significantly improves the prognosis.
• Therapeutic management: drug treatments and comprehensive supportThe management of rheumatoid arthritis aims to reduce inflammation, relieve pain, prevent irreversible joint damage, and improve quality of life. It combines several approaches:
• Dose-modifying antirheumatic drugs (DMARDs): these treatments slow the progression of the disease and can induce remission. Methotrexate is the most commonly prescribed, often starting immediately after diagnosis. Biological agents: developed with the support of laboratories such as Amgen ,
• Bristol Myers Squibb

, and Johnson & Johnson , these medications specifically target inflammatory mediators such as TNF or IL-6. Non-steroidal anti-inflammatory drugs (NSAIDs): They relieve pain and reduce inflammation in the short term but do not alter the progression of the disease.

• Corticosteroids: Effective quickly, but used with caution due to long-term side effects. Beyond medication, support from healthcare professionals is crucial:
• Physiotherapy and
• occupational therapy: To maintain mobility and adapt daily activities. Lifestyle and dietary measures: Mediterranean diet, smoking cessation, and weight management.

Therapeutic education: To help the patient understand and manage their disease.

For severe or debilitating conditions, surgery may be considered, particularly joint replacement, with significant improvement in function despite long-term follow-up and appropriate rehabilitation.

A concrete example: Mr. Martin, 52 years old, started treatment with methotrexate combined with a biologic developed by Lilly. After several months, her pain decreased significantly, and her mobility improved thanks to a regular physiotherapy program. Regular monitoring helped prevent complications, demonstrating the importance of multidisciplinary care. Practical advice and recommendations for rheumatoid arthritis

Faced with this complex disease, it is essential to adopt a proactive approach to best manage your daily life:

Consult a healthcare professional promptly if you experience persistent pain and prolonged morning stiffness.

• Follow the prescribed treatment and do not stop it without medical advice, even if the symptoms lessen. Adapt your lifestyle by favoring a balanced diet rich in omega-3 fatty acids and avoiding tobacco.
• Engage in gentle and regular physical activity, such as swimming or walking, to maintain mobility without worsening inflammation. Use assistive devices if necessary (splints, orthopedic shoes) to relieve pressure on the affected joints. Keep your vaccinations up to date to limit the risk of infection, especially if you are taking immunosuppressants. In the event of a severe inflammatory flare-up, appropriate rest can help reduce pain, but it is important to avoid prolonged immobilization, which could lead to loss of function. Many healthcare centers now rely on personalized programs to support patients, including stress management and occupational therapy workshops.
• Finally, don’t hesitate to join associations or support groups that allow you to share your experiences with the illness and benefit from psychological support.