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Adult Still's disease (ASD) is an inflammatory condition in which you may experience daily spiking fevers, have achy or swollen joints and discover a salmon-pink rash appearing on your body. The disorder is rare. As it progresses, Adult Still's disease may lead to chronic arthritis and other complications.

Still's disease is named after an English doctor named George Still, who described the condition in children in 1896. Still's disease is now known as systemic onset juvenile rheumatoid arthritis (JRA). In 1971, the term "Adult Still's disease" was used to describe adults who had a condition similar to systemic onset JRA. There's no cure for Adult Still's disease; however, treatment may offer symptom relief for Adult Still's disease and help prevent complications.

Most people with Adult Still's disease experience a combination of the following signs and symptoms:

• Fever. You may experience a daily fever of at least 102 F for a week or longer. The fever usually peaks in the late afternoon or early evening. Between episodes, your temperature will likely return to normal.
• Rash. A salmon-pink bumpy or flat rash may come and go with the fever. The rash usually appears on your trunk, arms or legs. Physical contact such as rubbing your skin or exposing it to hot water may provoke the rash to appear.
• Achy and swollen joints. You may find that your joints — especially your knees, wrists, ankles and elbows — are stiff, painful and inflamed. Usually, the joint discomfort lasts at least two weeks.
• Muscle pain. Muscular pain associated with Adult Still's disease usually ebbs and flows with the fever. It may be severe enough to disrupt your daily activities.

Other signs and symptoms may include:

• Sore throat
• Swollen lymph nodes in your neck
• Enlarged liver or spleen

Having any of these signs or symptoms doesn't necessarily mean that you have Adult Still's disease. The signs and symptoms of this disorder may mimic those of other conditions. These include other infectious diseases such as infectious mononucleosis, a type of cancer called lymphoma or other rheumatic diseases, including rheumatoid arthritis.

Although it's not certain what causes Adult Still's disease, it may be that the condition is triggered by a viral or bacterial infection.

Age is the main risk factor for Adult Still's disease, with incidence in adults peaking twice: once from 15 to 25 years and again from 36 to 46 years. Males and females are equally at risk of acquiring the disorder. Multiple cases of Adult Still's disease in families are uncommon, so it's unlikely that this disorder is inherited.

If you have a high fever, rash and achy joints that have persisted for at least two weeks, see your doctor to determine what may be the cause. Also, if you have Adult Still's disease and develop a cough, difficulty breathing, chest pain or any other unusual symptoms, call your doctor.

There's no single test used to diagnose Adult Still's disease. Your doctor will likely consider a number of diagnostic tools, because the signs and symptoms of Adult Still's disease may mimic those of other conditions, such as mononucleosis, lymphoma or other rheumatic diseases. Your doctor may make a diagnosis based on the following:

• Signs and symptoms. Your doctor might suspect Adult Still's disease if a physical exam reveals that you have a high fever, swollen joints and a salmon-pink rash. Swollen lymph nodes and a sore throat are also common.
• Imaging tests. Inflammation of the lining of your heart or lungs may be detected by an echocardiogram. X-rays of your bones may show changes in your wrists, spine, foot or finger joints. A computerized tomography (CT) scan or ultrasound may indicate that your liver or spleen is enlarged.

• Blood tests. A number of blood tests may give an indication that you have Adult Still's disease. One type of test measures counts of certain blood cells: Typically, the number of white blood cells and platelets are high, while the red blood cell count is often low (anemia).

  Another common blood test for people with inflammatory conditions involves checking your erythrocyte sedimentation rate (sed rate). This test measures how quickly your red blood cells settle when placed in a test tube. Generally, the blood cells fall faster — that is, the sed rate increases — when inflammation is present.

  In addition, liver function tests can help determine how well your liver is working; in case of Adult Still's disease, levels of certain liver enzymes may be elevated.

Most complications from adult Still's disease arise from chronic inflammation of your body organs and joints.

• Joint destruction. Chronic inflammation can damage your joints. The most commonly involved joints are your wrists, but your neck, foot, finger, hip and knee joints also may be affected. In severe cases, joint replacement surgery may be necessary in your hip or knee joints.
• Inflammation of your heart. Adult Still's disease can lead to an inflammation of the sac-like covering of your heart (pericarditis) or of the muscular portion of your heart (myocarditis).
• Excess fluid around your lungs. Inflammation may cause an excess of fluid to build up in the fluid-filled space that surrounds your lungs.

Doctors use a variety of drugs to treat Adult Still's disease. The type of drug you'll take depends on the severity of your symptoms and whether you experience side effects.

• Nonsteroidal anti-inflammatory drugs (NSAIDs). NSAIDs, such as aspirin, ibuprofen (Advil, Motrin IB, others) or naproxen (Aleve, Anaprox, others), help reduce inflammation. These drugs are often useful for controlling mild symptoms. If you take NSAIDs, you'll need regular blood tests to monitor your liver function, because high doses of NSAIDs can damage your liver.
• Glucocorticoids. People with high fever spikes, severe joint symptoms or complications with their internal organs might require glucocorticoids, such as prednisone. Glucocorticoids help subdue your body's immune response. While glucocorticoids are often a successful treatment for Adult Still's disease, these drugs may lower your body's resistance to infections and will increase your risk of developing osteoporosis.
• Methotrexate. The medication methotrexate (Rheumatrex) has been used successfully in a small series of patients to treat ASD. It may also be used as a "steroid-sparing agent," meaning that if you take methotrexate, smaller doses of corticosteroids may be able to control your disease.

Experimental drugs
Several drugs that are not standard therapy for Adult Still's disease have been reported to help some people with this condition. One of these drugs is called a tumor necrosis factor (TNF) blocker. TNF blockers, including infliximab (Remicade) and etanercept (Enbrel), may work by blocking the activity of TNF, a chemical that causes joint swelling.

Other experimental drugs, including cyclosporine (Sandimmune), intravenous immunoglobulin (IVIg), anakinra (Kineret) and thalidomide (Thalomid), have also been successful in small groups of people.

Outlook
Even with treatment, it's difficult to predict the course of Adult Still's disease. Some people might only experience a single episode, while for others Adult Still's disease may develop into a chronic condition. About one-third of people with the disorder fall into each of the following groups:

• Recovery. In some cases, the signs and symptoms disappear within one year and do not recur.
• Occasional flare-ups. People with this form of the condition experience unpredictable eruptions of their signs and symptoms but feel normal between episodes.
• Chronic arthritis. The chronic form of Adult Still's disease may last for years and cause debilitating arthritis. Fortunately, up to 25 percent of the people with chronic Adult Still's disease eventually improve.

Adult Still's disease can't be prevented. However, sticking to your treatment regimen and calling your doctor if you develop problems may help reduce the risk that you'll suffer complications.

Here are a few ways to help you make the most of your health if you have Adult Still's disease:

• Understand your medications. Even if you're symptom-free some days, it's important to take your medications as your doctor recommends to control inflammation. Controlling inflammation helps reduce the risk of complications.
• Supplement your diet. If you're taking glucocorticoids for longer than a month, talk to your doctor about taking calcium and vitamin D supplements to help prevent osteoporosis.
• Keep moving. While you might not feel up to a workout if your joints ache, exercising can maintain your range of motion and relieve pain and stiffness.