Rheumatoid Arthritis at a Glance
Rheumatoid arthritis is an autoimmune condition where the immune system attacks the joints, causing inflammation and pain.
Common symptoms include:
- Joint pain and swelling
- Morning stiffness lasting longer than 30 minutes
- Fatigue and low energy
- Warm, tender joints
- Reduced range of motion
- Brain fog or difficulty concentrating
RA most commonly affects:
- Hands and fingers
- Wrists
- Feet and toes
- Knees and ankles
One characteristic feature of rheumatoid arthritis is that symptoms often occur symmetrically, meaning both sides of the body are affected.
While RA primarily affects the joints, it is considered a systemic inflammatory disease, meaning it can influence multiple systems throughout the body.
What Is Rheumatoid Arthritis?
Rheumatoid arthritis is a chronic autoimmune disorder that causes inflammation within the joints.
In autoimmune diseases, the immune system mistakenly identifies the body’s own tissues as harmful and launches an attack against them. In RA, this attack is directed toward the synovium, the membrane that lines the joints.
When this tissue becomes inflamed:
- The joint lining thickens
- Fluid accumulates within the joint
- Pain and swelling develop
- Movement becomes restricted
If the inflammatory process continues over time, it may lead to joint damage and deformity.
RA often develops gradually and symptoms may fluctuate between periods of flare-ups and periods of relative calm.
How Rheumatoid Arthritis Affects the Body
Rheumatoid arthritis involves several biological mechanisms that contribute to inflammation and joint damage.
Immune System Dysregulation
Immune cells release inflammatory molecules known as cytokines, including tumour necrosis factor (TNF) and interleukins. These chemicals promote inflammation within the joints.
While inflammation is normally a protective response to injury or infection, in RA it becomes chronic and targets healthy tissue.
This persistent immune activation contributes to swelling, joint damage, and systemic symptoms such as fatigue.
Chronic Inflammation
When inflammatory signals remain active for long periods of time, they can damage cartilage and bone within the joints. This can eventually lead to reduced joint mobility and structural changes.
Chronic inflammation can also affect other systems in the body, contributing to:
- fatigue
- muscle weakness
- increased cardiovascular risk
- general feelings of unwellness
This is why RA is considered a whole-body inflammatory condition, not simply a joint disorder.
Genetic Susceptibility
Certain genetic variations, particularly within the HLA gene family, are associated with a higher risk of RA. These genes play an important role in immune system regulation.
However, genetics alone do not determine whether someone will develop the condition. Many individuals with these genes never develop RA, suggesting that additional environmental or biological triggers are involved.
The Role of the Gut and Immune System
The gut microbiome plays an important role in regulating immune responses. Changes in microbial balance may influence inflammation and immune signalling throughout the body.
Some studies have observed differences in gut bacteria among individuals with rheumatoid arthritis compared to healthy individuals.
This has led researchers to explore how gut health and immune regulation may be linked in autoimmune conditions.
Joint Damage and Reduced Mobility
This damage may lead to:
- joint deformity
- reduced mobility
- difficulty performing daily activities
Fatigue and Energy Changes
Chronic inflammation can place increased demands on the body’s energy systems, which may contribute to ongoing feelings of exhaustion and reduced stamina.
Increased Systemic Inflammation
Long-term inflammation has been associated with increased risk of conditions such as cardiovascular disease and metabolic disturbances.
This highlights the importance of viewing RA as a systemic condition rather than simply a joint disorder.
Long-Term Effects of Rheumatoid Arthritis
If inflammation persists over time, rheumatoid arthritis can affect both joint health and wider physical wellbeing.
