Adult Still’s disease is a rare illness that causes high fevers, rash, and joint pain. It may lead to long-term (chronic) arthritis.
Still’s disease is a severe version of juvenile idiopathic arthritis (JIA), which occurs in children. Adults can have the same condition.
The disease is much less common and now called adult-onset Still’s disease (AOSD).
Still’s disease – adult; AOSD
Causes, incidence, and risk factors
Fewer than 1 out of 100,000 people develop adult Still’s disease each year. It affects women more often than men.
Still’s disease that occurs in children is called systemic juvenile idiopathic arthritis.
The cause of adult Still’s disease is unknown. No risk factors for the disease have been identified.
Almost all people with the disease will have fever, joint pain, sore throat, and a rash.
Joint pain, warmth, and swelling are common. Most often, several joints are involved at the same time. Often, patients have morning stiffness of joints that lasts for several hours.
The fever comes on quickly once per day, most commonly in the afternoon or evening.
The skin rash is often salmon-pink colored and comes and goes with the fever.
Additional symptoms include:
- Abdominal pain and swelling
Pain with a deep breath (pleurisy)
Swollen lymph nodes (glands)
The spleen or liver may become swollen. Lung and heart inflammation may also occur.
Signs and tests
Adult Still’s disease can only be diagnosed after other diseases are ruled out. You may need many medical tests before a final diagnosis is made.
A physical exam may show a fever, rash, and arthritis. The health care provider will use a stethoscope to listen for changes in the sound of your heart or lungs.
The following blood tests can be helpful in diagnosing adult Still’s disease:
Complete blood count(CBC) may show a high number of white blood cells and reduced number of red blood cells. C-reactive protein(CRP), a measure of inflammation, will be higher than normal.
ESR(sedimentation rate), a measure of inflammation, will be higher than normal.
Ferritinlevel will be very high.
Fibrinogen level will be high.
Liver function testswill show high levels of ASTand ALT. Rheumatoid factorand ANAtest will be negative.
Other tests may be needed to check for inflammation of the joints, chest, liver, and spleen:
CT scan of the abdomen
X-rays of the joints, chest, or stomach area (abdomen)
The goal of treatment for adult Still’s disease is to control the symptoms of
Prednisone may be used for more severe cases.
If the disease persists for a long time (becomes chronic), medicines that suppress the immune system might be needed. Such medicines include:
Anakinra (interleukin-1 receptor agonist)
Tumor necrosis factor (TNF) antagonists such as Enbrel (etanercept)
Studies show that in about 1 in 5 people all symptoms go away in a year and never come back. In many people, symptoms go away but then come back several times over the next few years.
Symptoms continue for a long time (chronic) in about half of patients with adult Still’s disease.
- Arthritis in several joints
- Liver disease
Pericarditis Pleural effusion
- Spleen enlargement
Calling your health care provider
Call your health care provider if you have symptoms of adult Still’s disease.
If you have already been diagnosed with the condition, you should call your health care provider if you have a