Rheumatoid arthritis can be difficult to diagnose in its early stages for several reasons. First, there is no single test for the disease. In addition, symptoms differ from person to person and can be more severe in some people than in others. Also, symptoms can be similar to those of other types of arthritis and joint conditions, and it may take some time for other conditions to be ruled out. Finally, the full range of symptoms develops over time, and only a few symptoms may be present in the early stages. As a result, doctors use a variety of the following tools to diagnose the disease and to rule out other conditions:
Medical history
The doctor begins by asking the patient to describe the symptoms, and when and how the condition started, as well as how the symptoms have changed over time. The doctor will also ask about any other medical problems the patient and close family members have and about any medications the patient is taking. Accurate answers to these questions can help the doctor make a diagnosis and understand the impact the disease has on the patient’s life.
Good communication between patient and doctor is especially important. For example, the patient’s description of pain, stiffness, and joint function and how these change over time is critical to the doctor’s initial assessment of the disease and how it changes over time.
Physical examination
The doctor will check the patient’s reflexes and general health, including muscle strength. The doctor will also examine bothersome joints and observe the patient’s ability to walk, bend, and carry out activities of daily living. The doctor will also look at the skin for a rash and listen to the chest for signs of inflammation in the lungs.
Laboratory tests
A number of lab tests may be useful in confirming a diagnosis of rheumatoid arthritis. Following are some of the more common ones:
- Rheumatoid factor (RF): Rheumatoid factor is an antibody that is present eventually in the blood of most people with rheumatoid arthritis. (An antibody is a special protein made by the immune system that normally helps fight foreign substances in the body.) Not all people with rheumatoid arthritis test positive for rheumatoid factor, and some people test positive for rheumatoid factor, yet never develop the disease. Rheumatoid factor also can be positive in some other diseases; however, a positive RF in a person who has symptoms consistent with those of rheumatoid arthritis can be useful in confirming a diagnosis. Furthermore, high levels of rheumatoid factor are associated with more severe rheumatoid arthritis.
- Anti-CCP antibodies: This blood test detects antibodies to cyclic citrullinated peptide (anti-CCP). This test is positive in most people with rheumatoid arthritis and can even be positive years before rheumatoid arthritis symptoms develop. When used with the RF, this test’s results are very useful in confirming a rheumatoid arthritis diagnosis.
- Others: Other common laboratory tests include a white blood cell count, a blood test for anemia, which is common in rheumatoid arthritis; the erythrocyte sedimentation rate (often called the sed rate), which measures inflammation in the body; and C-reactive protein, another common test for inflammation that is useful both in making a diagnosis and monitoring disease activity and response to anti-inflammatory therapy.
X rays
X rays are used to determine the degree of joint destruction. They are not useful in the early stages of rheumatoid arthritis before bone damage is evident; however, they may be used to rule out other causes of joint pain. They may also be used later to monitor the progression of the disease.
Rheumatoid arthritis (RA) is an inflammatory disease that causes pain, swelling, stiffness, and loss of function in the joints. It occurs when the immune system, which normally defends the body from invading organisms, turns its attack against the membrane lining the joints.
Rheumatoid arthritis has several features that make it different from other kinds of arthritis. For example, rheumatoid arthritis generally occurs in a symmetrical pattern, meaning that if one knee or hand is involved, the other one also is. The disease often affects the wrist joints and the finger joints closest to the hand. It can also affect other parts of the body besides the joints. In addition, people with rheumatoid arthritis may have fatigue, occasional fevers, and a general sense of not feeling well.
The course of rheumatoid arthritis can range from mild to severe. In most cases it is chronic, meaning it lasts a long time—often a lifetime. For many people, periods of relatively mild disease activity are punctuated by flares, or times of heightened disease activity. In others, symptoms are constant.
Diagnosing and treating rheumatoid arthritis requires a team effort involving the patient and several types of health care professionals.
The primary doctor to treat arthritis may be an internist, a doctor who specializes in the diagnosis and medical treatment of adults, or a rheumatologist, a doctor who specializes in arthritis and other diseases of the bones, joints, and muscles.
As treatment progresses, other professionals often help. These may include the following:
- Orthopaedists: Surgeons who specialize in the treatment of, and surgery for, bone and joint diseases.
- Physical therapists: Health professionals who work with patients to improve joint function.
- Occupational therapists: Health professionals who teach ways to protect joints, minimize pain, perform activities of daily living, and conserve energy.
- Dietitians: Health professionals who teach ways to use a good diet to improve health and maintain a healthy weight.
- Nurse educators: Nurses who specialize in helping patients understand their overall condition and implement their treatment plans.
- Psychologists: Health professionals who seek to help patients cope with difficulties in the home and workplace that may result from their medical conditions.
Scientists still do not know exactly what causes the immune system to turn against itself in rheumatoid arthritis, but research over the last few years has begun to piece together the factors involved.
Genetic (inherited) factors
Scientists have discovered that certain genes known to play a role in the immune system are associated with a tendency to develop rheumatoid arthritis. For the genes that have been linked to rheumatoid arthritis, the frequency of the risky gene is only modestly higher in those with rheumatoid arthritis compared with healthy controls. In other words, individual genes by themselves confer only a small relative risk of disease. Some people who have these particular genes never develop the disease. These observations suggest that although a person’s genetic makeup plays an important role in determining if he or she will develop rheumatoid arthritis, it is not the only factor. What is clear, however, is that more than one gene is involved in determining whether a person develops rheumatoid arthritis and how severe the disease will become.
Environmental factors
Many scientists think that something must occur to trigger the disease process in people whose genetic makeup makes them susceptible to rheumatoid arthritis. A viral or bacterial infection appears likely, but the exact agent is not yet known. This does not mean that rheumatoid arthritis is contagious: a person cannot catch it from someone else.
Other factors
Some scientists also think that a variety of hormonal factors may be involved. Women are more likely to develop rheumatoid arthritis than men. The disease may improve during pregnancy and flare after pregnancy. Breastfeeding may also aggravate the disease. Contraceptive use may alter a person’s likelihood of developing rheumatoid arthritis. This suggests hormones, or possibly deficiencies or changes in certain hormones, may promote the development of rheumatoid arthritis in a genetically susceptible person who has been exposed to a triggering agent from the environment.
Even though all the answers are not known, one thing is certain: rheumatoid arthritis develops as a result of an interaction of many factors. Researchers are trying to understand these factors and how they work together.
Scientists are making rapid progress in understanding the complexities of rheumatoid arthritis: how and why it develops, why some people get it and others do not, why some people get it more severely than others. Results from research are having an impact today, enabling people with rheumatoid arthritis to remain active in life, family, and work far longer than was possible 20 years ago. There is also hope for tomorrow, as researchers begin to apply new technologies such as stem cell transplantation and novel imaging techniques. (Stem cells have the capacity to differentiate into specific cell types, which gives them the potential to change damaged tissue in which they are placed.) These and other advances will lead to an improved quality of life for people with rheumatoid arthritis.
Doctors use a variety of approaches to treat rheumatoid arthritis. These are used in different combinations and at different times during the course of the disease and are chosen according to the patient’s individual situation. No matter what treatment the doctor and patient choose, however, the goals are the same: to relieve pain, reduce inflammation, slow down or stop joint damage, and improve the person’s sense of well-being and ability to function.
Good communication between the patient and doctor is necessary for effective treatment. Talking to the doctor can help ensure that exercise and pain management programs are provided as needed, and that drugs are prescribed appropriately. Talking to the doctor can also help people who are making decisions about surgery.
There are many prescription medications used to treat rheumatoid arthritis such as hydroxychloroquine (Plaquenil), chloroquine (Aralen), leflunomide (Arava), and methotrexate (Rheumatrex ). Non-pharmacological treatment includes psychical therapy, orthoses, and nutritional therapy but these do not stop progression of joint destruction. Analgesics (painkillers) and anti-inflammatory drugs, including steroids, are used to suppress the symptoms, while disease-modifying antirheumatic drugs (DMARDs) are required to inhibit or halt the underlying immune process and prevent long-term damage.
Recently the newer group of biologics, such as abatacept (Orencia), adalimumab (Humira), etanercept (Enbrel), infliximab (Remicade), and rituximab (Rituxan) have increased treatment options.
Rheumatoid arthritis is primarily a disease of the joints. A joint is the point where two or more bones come together. With a few exceptions (in the skull and pelvis, for example), joints are designed to allow movement between the bones and to absorb shock from movements like walking or repetitive motions. The ends of the bones are covered by a tough, elastic tissue called cartilage. The joint is surrounded by a capsule that protects and supports it (see illustration). The joint capsule is lined with a type of tissue called synovium, which produces synovial fluid, a clear substance that lubricates and nourishes the cartilage and bones inside the joint capsule.
Like many other rheumatic diseases, rheumatoid arthritis is an autoimmune disease (auto means self), so-called because a person’s immune system, which normally helps protect the body from infection and disease, attacks joint tissues for unknown reasons. White blood cells, the agents of the immune system, travel to the synovium and cause inflammation (synovitis), characterized by warmth, redness, swelling, and pain—typical symptoms of rheumatoid arthritis. During the inflammation process, the normally thin synovium becomes thick and makes the joint swollen and puffy to the touch.
As rheumatoid arthritis progresses, the inflamed synovium invades and destroys the cartilage and bone within the joint. The surrounding muscles, ligaments, and tendons that support and stabilize the joint become weak and unable to work normally. These effects lead to the pain and joint damage often seen in rheumatoid arthritis. Researchers studying rheumatoid arthritis now believe that it begins to damage bones during the first year or two that a person has the disease, one reason why early diagnosis and treatment are so important.
Some people with rheumatoid arthritis also have symptoms in places other than their joints. Many people with rheumatoid arthritis develop anemia, or a decrease in the production of red blood cells. Other effects that occur less often include neck pain and dry eyes and mouth. Very rarely, people may have inflammation of the blood vessels (vasculitis), the lining of the lungs (pleurisy), or the sac enclosing the heart (pericarditis).
Features of Rheumatoid Arthritis
- Tender, warm, swollen joints
- Symmetrical pattern of affected joints
- Joint inflammation often affecting the wrist and finger joints closest to the hand
- Joint inflammation sometimes affecting other joints, including the neck, shoulders, elbows, hips, knees, ankles, and feet
- Fatigue, occasional fevers, a general sense of not feeling well
- Pain and stiffness lasting for more than 30 minutes in the morning or after a long rest
- Symptoms that last for many years
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Variability of symptoms among people with the disease
Although health care professionals can prescribe or recommend treatments to help patients manage their rheumatoid arthritis, the real key to living well with the disease are the patients themselves. Research shows that people who take part in their own care report less pain and make fewer doctor visits. They also enjoy a better quality of life.
Patient education and arthritis self-management programs, as well as support groups, help people to become better informed and to participate in their own care. An example of a self-management program is the Arthritis Self-Help Course offered by the Arthritis Foundation and developed at a NIAMS-supported Multipurpose Arthritis and Musculoskeletal Diseases Center. Self-management programs teach about rheumatoid arthritis and its treatments, exercise and relaxation approaches, communication between patients and health care providers, and problem solving. Research on these programs has shown that they help people:
- understand the disease
- reduce their pain while remaining active
- cope physically, emotionally, and mentally
- feel greater control over the disease and build a sense of confidence in the ability to function and lead full, active, and independent lives.