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Rheumatoid Arthritis

Written by Ada’s Medical Knowledge Team

Updated on

What is rheumatoid arthritis?

Rheumatoid arthritis (RA) is a long-term, inflammatory arthritis, which develops gradually and is caused by an autoimmune reaction. This means that the immune system mistakenly forms proteins which are meant to fight infections, known as antibodies, that attack the body tissue instead.

The symptoms of rheumatoid arthritis occur in episodes or flare ups of pain and swelling in the joints, with periods of remission in between. Usually the joints are affected symmetrically, especially the hands, wrists and feet, and many joints may be inflamed. It can also affect other parts of a person’s body, including the lungs, heart and eyes. Onset may include symptoms such as fever and fatigue.

The prevalence of RA varies between populations around the world, from 0.1 percent in rural Africans to 5 percent in some Native American groups. Women are affected two to three times more often than men. 1

The age of onset for rheumatoid arthritis is usually over 35, and the likelihood of developing the condition increases as a person gets older. Onset is highest among adults in their 60s. However, the condition can occur at any age from the age of 14, when it may be called early-onset rheumatoid arthritis. 2 Rheumatoid arthritis is normally a lifelong condition that worsens with age.

If RA is not treated early, it can cause irreversible damage to joints, leading to disability. However, it can normally be well-managed with medications to slow down the immune system, thereby slowing the progression of the disease, as well as pain medications for relief of symptoms. There is currently no specific cure for rheumatoid arthritis.

By definition, rheumatoid arthritis appears in adults and not in children. However, a related condition may sometimes appear in children, which is known as juvenile idiopathic arthritis, previously known as juvenile rheumatoid arthritis. Juvenile idiopathic arthritis may clear up by the time adulthood is reached. Many children with this condition also experience regular fevers.

If you think you might have rheumatoid arthritis, try using the free Ada App to find out more about your symptoms.

Rheumatoid arthritis symptoms

In most people, rheumatoid arthritis (RA) symptoms begin very subtly, and it may be many weeks or months before they become troublesome enough to seek medical attention.

Early signs and symptoms of rheumatoid arthritis may include: 1 2

  • Joint stiffness, often in the hands and feet, usually worse in the morning
  • Joint pain and swelling
  • Fatigue
  • Muscle pain
  • Low-grade fever
  • Numbness and tingling in the hands

Good to know: Rheumatoid arthritis typically affects the small joints first, such as the first two joints of the fingers and the first joints of the toes. Symptoms of rheumatoid arthritis in the hands occur rarely in the distal or outermost joints. RA can also start in one large joint, such as the knee or the shoulder, and may move from one joint to another or disappear for a long time before recurring. Worried that you or someone you know may be experiencing symptoms of rheumatoid arthritis? Try the Ada app for a free assessment.

Causes of rheumatoid arthritis

Rheumatoid arthritis is an autoimmune disease, which means that it is caused by abnormal functioning of the immune system. In a healthy immune system, the body attacks foreign bacteria and viruses. In the case of autoimmune disease, the body accidentally attacks healthy tissue instead. In rheumatoid arthritis, the body attacks its own joint tissue. Healthy joints are needed to absorb shock and allow for smooth movement between the bones.

People with RA produce an excess of white blood cells in the synovial membrane, also known as the synovium, the tissue that lines the cavities of joints, causing inflammation. This can lead to joint erosion, loss of motion and occasionally damage to other associated parts of the body, such as the lungs, heart, blood vessels and eyes.

If RA is left untreated, pannus tissue may form, in which there is excess, uneven tissue growth in a joint, which can further erode and damage cartilage and bone.

Risk factors

It is not certain what causes rheumatoid arthritis (RA), but some possible contributing factors have been identified, including:


Specific variants in the human leukocyte antigen (HLA) genes are associated with a higher risk of developing RA. These variations make the white blood cells attempt to correct abnormalities in the joints more quickly than usual, which may be what leads to the inflammation and associated tissue damage that results from rheumatoid arthritis.

However, rheumatoid arthritis is not an inherited condition; not everyone with RA has a variant HLA system and not everyone with a variant HLA develops RA. Genes do not cause the condition, but affect the risk of it developing. 3 Other non-HLA genes have also been linked to RA. 4

Bacteria and viruses

Certain microbial infections are believed to play an important role in triggering and worsening RA. These may include: 5

  • A gum infection, specifically P. gingivalis
  • A urine infection, specifically P. mirabilis
  • The Epstein-Barr virus, best known as the cause of mononucleosis


Research has shown that exposure to certain irritants in the air may play a role in a person’s risk of developing rheumatoid arthritis, including: 6 7

  • Tobacco smoke
  • Silica dust, mainly affecting people in the mining industry
  • Certain mineral oils, such as found in hydraulic oil

Good to know: Once rheumatoid arthritis has developed, using tobacco products can also increase the severity of rheumatoid arthritis symptoms and interfere with rheumatoid arthritis medication. Using tobacco products, particularly smoking, may also cause a debilitating increase in heart rate and breathing rate, which may lead to a loss of will to exercise, in turn leading to further joint weakening. Tobacco smoking can also increase the risk of complications if surgery is needed for rheumatoid arthritis.

Being female

Rheumatoid arthritis is far more common in women, who make up about 70 percent of people diagnosed. It is not known exactly why women are more likely to develop the condition, but hormonal factors are thought to play a part. The condition tends to decrease or disappear during pregnancy and people with the condition may experience flare ups in the weeks after giving birth. 8 It has been suggested that this may be due to production of prolactin, the milk production hormone, having an inflammatory effect. 7

Physical trauma

Physical trauma has been linked to rheumatoid arthritis onset, such as with sports injuries. Physical trauma can trigger inflammation, which it is thought may contribute to the development of rheumatoid arthritis, possibly at a much later date. However, it is not known why this might be. Some people may have a predisposition to such inflammation. 9


Research has found that obesity may have an impact on the development of the condition. 10 11 It is not known why this is, but one reason postulated is that fat cells release proteins called cytokines, which create inflammation throughout the body. 12

Good to know: Obesity may also have a negative impact on the effectiveness of rheumatoid arthritis treatment, particularly with some disease-modifying antirheumatic drugs (DMARDs). 13 It can also lead to earlier deterioration of the main joints, such as the knees, due to increased pressure.

Rheumatoid arthritis and COVID-19

People with rheumatoid arthritis are more susceptible to infections, including an infection with the coronavirus. If you have rheumatoid arthritis and COVID-19, you may be at risk for severe complications, hospitalization, and even death.

Diagnosing rheumatoid arthritis

Diagnosis of rheumatoid arthritis (RA) is generally confirmed after referral to a rheumatologist, a type of doctor specializing in inflammation and pain in the joints, muscles, or fibrous tissues.

RA can take a long time to diagnose as its early onset can be subtle and present similarly to other, less long-term conditions, such as flu, also known as influenza. It also often presents similarly to other types of arthritis, such as reactive arthritis.

Unlike other types of arthritis, there is no specific test for rheumatoid arthritis. Instead, a rheumatologist relies on gathering information to rule out other conditions and identify the cause of a person’s symptoms. Diagnosis may be made from a combination of reported medical history and symptoms, a physical examination, laboratory tests and medical imaging. Try the Ada app for a free symptom assessment.

Interview and physical exam

It is important that a person describe any joint pain and other symptoms, as well as how long they have been going on for.

A doctor will look for signs of rheumatoid arthritis, such as swollen, tender, warm joints with painful or limited movement, and rheumatoid nodules (see complications). They may also ask for family medical history; if another member of their family has the disease, then a person has a higher risk of having the condition themselves.

Laboratory tests

If a doctor suspects rheumatoid arthritis, one or more blood tests may be done to help make a diagnosis. These include: 14

Testing for rheumatoid factor (RF) and anti-cyclic citrullinated peptide (CCP) antibodies: RF is a protein that attacks healthy tissues. If it is present, there is about an 80 percent chance that a person has or may develop rheumatoid arthritis or another inflammatory disease. Anti-CCP antibodies indicate that a person is very likely to develop RA.

Measuring inflammatory markers: Abnormally high levels of certain markers in the blood would support a diagnosis that symptoms are caused by an inflammatory condition such as rheumatoid arthritis. Inflammatory markers which may be detected by a blood test include:

  • Tumor necrosis factor-alpha
  • Erythrocyte sedimentation rate (ESR or sed rate)
  • C-reactive protein (CRP)

Good to know: The presence of anti-CCP antibodies in the blood indicates that a person with RA may be more likely to develop severe symptoms, requiring more intensive treatment.

Read more about Blood Test Results »

Medical imaging

A doctor may also recommend an X-ray, ultrasound or magnetic resonance imaging (MRI) scan of the affected joint. This can help to rule out other conditions that present with similar symptoms, such as gout. However, at an early stage of rheumatoid arthritis, any characteristic damage caused by the condition may not be apparent. 14

Treating rheumatoid arthritis

It is very important to start treatment as soon as possible to prevent any permanent joint damage. Rheumatoid arthritis (RA) can usually be effectively managed with early, appropriate treatment. There is currently no rheumatoid arthritis cure, and it is usually a chronic condition requiring lifelong treatment.

The main aims of treatment for RA are: 15 16

  • To prevent joint damage
  • To minimize pain and other symptoms, and maintain quality of life
  • To prevent the development of associated conditions such as osteoporosis and cardiovascular disease

There are three main aspects of rheumatoid arthritis treatment:

  • Medication
  • Physical therapy
  • In some cases, surgery


Rheumatoid arthritis is usually treated with a combination of medications. The five main types of drugs used for rheumatoid arthritis are: 16

Disease-modifying anti-rheumatic drugs (DMARDs), such as methotrexate. These work by blocking the effects of chemicals released by the immune system, which can damage nearby bones, tendons, ligaments and cartilage.

Biologic agents: Also known as biologic response modifiers, these are a newer class of DMARDs. Biologic DMARDs are most effective when paired with a nonbiologic DMARD. Biologics may be administered intravenously or by injection

Steroids: These quickly improve symptoms such as joint pain, stiffness and swelling and are generally recommended where rheumatoid arthritis severely limits a person’s ability to function normally, until slower acting joint damage-preventing DMARDs begin to work. These may be administered by injection to provide targeted pain relief.

Painkillers. NSAIDs such as ibuprofen, naproxen or celecoxib can offer pain relief while also reducing inflammation, though they won’t prevent RA from getting worse over time. Paracetamol, also known as acetaminophen, and codeine have no effect on inflammation, but may be helpful in relieving pain, for example in the case of a badly damaged joint that cannot be replaced with surgery.

Physical therapy

People with rheumatoid arthritis often become inactive due to joint pain and stiffness. However, inactivity can lead to inflexibility, muscle and tendon shortening, and muscle weakness. In turn, weakness further increases fatigue and decreases stability of the joints.

A physiotherapist can recommend safe exercises to strengthen muscles, restore joint range-of-motion joints and ease symptoms.

An occupational therapist may recommend ways to approach day-to-day activities without putting too much strain on the joints. They may also recommend splints if needed for hand and wrist support.

A podiatrist may work with a person on ways to ease problems with the feet and ankles, such as by using appropriate footwear.

Some people find that yoga helps to relieve symptoms, although currently there is not strong medical evidence to support this. People with RA must do yoga with proper supervision to ensure that it is safe.


Occasionally, surgery is needed to treat joints affected by rheumatoid arthritis. These can be minor surgeries, such as to release a nerve or tendon or more major surgeries such as hip, knee, shoulder and elbow replacements.


There are no clear-cut answers as to what diet to follow with rheumatoid arthritis, as there is a lot of conflicting evidence, and different diets may affect people in different ways. However, it is generally recommended that a person eat: 17 18

  • A balanced and varied diet with plenty of fruit, vegetables, fish, pulses, nuts and olive oil to get all the vitamins, minerals, antioxidants and other nutrients you need
  • Omega-3 fatty acid-rich food regularly, such as oily fish, seaweed and walnuts
  • Calcium-rich food, such as dairy products and calcium-enriched non-dairy products
  • Vitamin-D-rich food, such as eggs
  • Iron-rich food, such as dark green vegetables

Weight loss may be recommended for overweight people to reduce stress on affected joints. However, sometimes people with rheumatoid arthritis lose their appetite, and dietary therapy may be recommended to help ensure that an adequate amount of calories and nutrients are consumed.

Natural treatment

Natural treatments have not conclusively been shown to stop or slow rheumatoid arthritis progression, but certain treatments may help with pain relief when used in conjunction with prescribed rheumatoid arthritis medications, including:

Supplements for rheumatoid arthritis containing gamma-linolenic acid (GLA) have been shown to modestly improve joint pain, stiffness and grip strength. 19 This includes evening primrose oil or borage oil, especially when combined with fish oil, which reduces the synthesis of inflammatory by-products of GLA. 20

Calcium and vitamin D supplements may be recommended if not enough is consumed through diet. These can help to minimize bone loss, which is associated with steroid therapy. 16

Some people find that home remedies, such as essential oils and turmeric help to relieve symptoms, although there is currently no strong medical evidence to support these.

Good to know: Rheumatoid arthritis should never be treated exclusively with natural supplements or without seeing a doctor.

Support groups

Some people find it helpful to discuss their condition and treatment in support groups. There are many local support groups which meet up in person, as well as online forums, such as on The Arthritis Foundation or myRAteam.


As the condition progresses, further signs and symptoms of rheumatoid arthritis may develop, such as: 1 21

Rheumatoid arthritis in hands: The swelling associated with rheumatoid arthritis causes some people to develop carpal tunnel syndrome. This is the compression of a nerve running through the wrist, characterized by tingling, numbness and weakness in the hand. Certain permanent bone alterations can also occur with long-term rheumatoid arthritis, such as swan neck deformities, boutonniere deformities, ulnar deviation and the bowstring sign.

Rheumatoid arthritis in knee: Inflammation of the knee is associated with difficulty bending the knee, damage to the bones that meet at the knee, and excessive looseness of the supporting ligaments of the knee. This may cause the development of a Baker’s cyst, a cyst which fills with joint fluid in the hollow space at the back of the knee.

Rheumatoid arthritis in feet: Pain in the feet may cause a person with rheumatoid arthritis to stand with weight on the heels and the toes bent upwards. The top of the foot may be red and swollen, and the heel may be painful.

Rheumatoid arthritis nodules: These are firm lumps which develop under the skin, usually near joints which are inflamed or near pressure points. Common locations include the underside of the forearm, the elbow, and the fingers and knuckles of the hands.

Rheumatoid arthritis can cause inflammation of tissues other than the joints, for example: 1

Rheumatoid arthritis in the lungs: may cause shortness of breath and a dry cough.

Rheumatoid arthritis in the cervical spine, the bones of the neck: Although RA normally affects other joints, it can also affect the spine, causing back pain and, in severe cases, destruction of the joints.

Inflammation of the blood vessels, known as vasculitis: may cause a characteristic rheumatoid arthritis rash of spots which look like ulcers, and a wide variety of other symptoms, depending on the location of the affected blood vessels.

Inflammation of the skin, leading to multiple skin disorders, such as chronic hives, a rash also known as urticaria.

Inflammation of the tissue surrounding the heart, known as Pericarditis: may cause chest pain and shortness of breath.


While there is no known way to prevent the onset of rheumatoid arthritis, there are a few known ways in which a person can reduce the risk. These include:

  • Quitting tobacco smoking
  • Being physically active and eating a healthy diet
  • Taking steps to maintain a healthy weight

It is also important to see a doctor as soon as symptoms develop, as early treatment can greatly minimize the rheumatoid arthritis progression, as well as any permanent damage caused by flare ups.

Rheumatoid arthritis FAQs

Q: Osteoarthritis vs. rheumatoid arthritis – what is the difference?
A: Both rheumatoid arthritis (RA) and osteoarthritis (OA) are types of chronic, untreatable arthritis which may be confused due to having the similar symptom of joint pain and inflammation. However, they have different causes. Rheumatoid arthritis is an autoimmune disease typically with a sudden onset of symptoms and occurs in episodes of inflammation on symmetrical joints of the body. OA is a “wear and tear” condition associated with factors such as older age, injury or obesity. It develops slowly, caused by continuous use of particular joints. RA tends to involve additional symptoms such as fever and fatigue, whereas OA only affects the joints. Rheumatoid arthritis onset tends to occur from 30 to 60 years old, while OA tends to develop later in life. 22

Q: Is rheumatoid arthritis hereditary?
A: Rheumatoid arthritis is not hereditary but a person’s genetics can increase the chances of developing the condition, and a number of genetic markers have been identified that increase this risk. However, not everyone with RA has these, nor does everyone who has such genetic markers develop RA. Many genetic and environmental factors appear to be involved in whether a person develops rheumatoid arthritis. 23

Q: Is rheumatoid arthritis a disability?
A: If RA is not treated early, it can cause irreversible damage to joints, leading to disability. However, it can normally be well managed with medications to slow down the immune system, as well as pain medications for relief of symptoms. Rheumatoid arthritis is not usually categorized as a disability in itself. However, it may qualify a person for benefits and other disability rights in certain countries, such as the U.S., if the person experiences significant limitations in their abilities due to the condition.

Q: Are there different types of rheumatoid arthritis?
A: Some researchers believe that rheumatoid arthritis may actually be a collection of conditions, with genetic differences affecting the features of the disease. The most recognized differences in rheumatoid arthritis are between the seropositive and seronegative versions of the condition. Seropositive RA has anti-CCPs and/or rheumatoid factor present (see laboratory tests, while seronegative RA does not. Distinguishing between types may help doctors to find the best possible treatment. 24

Q: What are the 4 stages of rheumatoid arthritis?
A: Sometimes doctors divide RA up into four stages of progression, as this helps them to consider what treatment will be best. The four stages are as follows: 25 26

  • Stage 1: Early stage RA involves swelling of involved joints and pain with motion. There is generally not very much X-ray evidence of joint destruction.
  • Stage 2: Moderate RA involves destruction of cartilage and narrowing of the joint.
  • Stage 3: Severe RA involves pannus formation (see causes. Loss of joint cartilage exposes bone, leading to evident changes on X-ray, and joint deformities may become evident to the naked eye.
  • Stage 4: In terminal or end stage RA the inflammatory process has subsided, and the formation of scar tissue and/or fusing of bone results in ceased joint function. There may be nodule formation (see complications).

Q: Is rheumatoid arthritis fatal?**
A: No. However, complications of the condition may shorten lifespan by a few years in some people. Those with RA may have a higher risk of developing lung or heart problems, as well as infections, cancers and stomach problems, which may be life-threatening. Recent improvements in control of RA are likely to mean that the average lifespan of people with RA will improve. 27

Q: What are the signs of rheumatoid arthritis vs osteoarthritis in the hands?
A: Arthritis in the hands normally manifests differently in rheumatoid arthritis and osteoarthritis. The first signs of rheumatoid arthritis, which normally manifests in many joints throughout the body, are often in the hands, possibly causing dactylitis, an inflammation of the finger, in which the knuckles may disappear, giving the fingers the appearance of sausages. In osteoarthritis, arthritis develops gradually over a long period of time, and early signs may go unnoticed or ignored. It is often associated with a deep pain under the base of the thumb.

Q: What causes rheumatoid arthritis flare ups?
A: Some flare ups are unpredictable, without a known trigger. Others may have a known trigger. These may include: 28 29

  • Physical activity
  • Poor sleep
  • Stress
  • An infection

Q: What does rheumatoid arthritis feel like?
**A: The main symptom of rheumatoid arthritis is stiffness, swelling and pain in the joints, particularly first thing in the morning. Typically, this affects the hands and feet and is symmetrical. Many people also experience fatigue or flu-like symptoms. One of the main factors to point to a rheumatoid arthritis diagnosis is loss of function, i.e. one’s normal abilities, such as finding buttons difficult to fasten. If you are wondering whether your symptoms point to a rheumatoid arthritis diagnosis, try the Ada app for a free assessment.

Q: Can rheumatoid arthritis be cured?
A: There is currently no rheumatoid arthritis cure, and it is usually a chronic condition requiring lifelong treatment. However, early treatment and lifestyle changes, such as eating a healthy diet and quitting smoking, can reduce the risk of joint damage, disability and reduce inflammation, pain and swelling.

Q: Can rheumatoid arthritis go away?
A: No, it is a lifelong condition. However, with treatment some people have long periods of remission, in which symptoms are not felt, and the progression of the condition is halted.

Q: Psoriatic arthritis vs rheumatoid arthritis – what is the difference?
A: Both are types of long-term inflammatory arthritis. Psoriatic arthritis is associated psoriasis, a skin condition that causes red, flaky, crusty patches of skin with silvery scales, known as plaques. While rheumatoid arthritis normally occurs in symmetrical flare ups, psoriatic arthritis normally occurs in asymmetric flare ups. People with rheumatoid arthritis may also have psoriasis without having psoriatic arthritis.

Read more about the different types of arthritis »]

Other names for rheumatoid arthritis

  • RA
  • Inflammatory arthritis (This is a group of conditions including types of inflammatory arthritis such as rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, juvenile idiopathic arthritis and [systemic lupus erythematosus]/(conditions/systemic-lupus-erythematosus/), also known as lupus, among others)