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โตช้า

โรคข้ออักเสบเรื้อรังในเด็ก (JIA) คืออะไร อาการ สาเหตุ วิธีรักษาที่พ่อแม่ต้องรู้

<h2>Getting to Know Juvenile Idiopathic Arthritis (JIA)</h2>
Juvenile Idiopathic Arthritis (JIA) is a disease that causes joint inflammation in children, with symptoms persisting for more than 6 weeks and starting before the age of 16 years. The key point is that “no other definite cause” such as infection, cancer, or other autoimmune diseases can explain the condition.
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Although the name sounds complex, what parents should know is that JIA is one of the important joint diseases in childhood because it can affect physical health, growth, and various developmental aspects if not properly treated.
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<h2>Causes and Risk Factors</h2>
Currently, the exact cause is unknown, but it is believed to be due to the following factors:
<ol>
<li>Genetics: Children may have certain genetic traits that increase the risk of immune system malfunction, leading to damage to joints and other organs.</li>
<li>Environmental Triggers: Such as infection by certain viruses or bacteria, which may trigger the disease in genetically susceptible children.</li>
</ol>
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Although the exact cause cannot be clearly identified, it is understood that JIA does not result from overuse or injury of the joints but from abnormal immune system activity that attacks joints and other organs.
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<h2>Symptoms to Watch For</h2>
<ul>
<li>Swollen, red, warm, painful joints without a clear cause.</li>
<li>Morning stiffness or joint stiffness: Children may say “walking is difficult” or “getting out of bed is hard.”</li>
<li>General symptoms: such as persistent low-grade fever, easy fatigue, loss of appetite, and weight loss.</li>
<li>Skin rash, especially in systemic JIA, which may be accompanied by high fever.</li>
<li>Abnormal growth: Children may grow slower than normal, or the bones on the inflamed side may grow unevenly.</li>
</ul>
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<h2>Types and Key Characteristics of the Disease</h2>
Juvenile Idiopathic Arthritis (JIA) is classified into several types, which help doctors plan appropriate treatment. Organizations such as the American College of Rheumatology (ACR) and the International League of Associations for Rheumatology (ILAR) use similar criteria, summarized as follows:
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1. Oligoarticular JIA
<ul>
<li>Key features: Inflammation affects no more than 4 joints within the first 6 months, usually involving large joints such as the knees and ankles.</li>
<li>Important complications: Risk of asymptomatic uveitis, requiring regular eye examinations.</li>
</ul>
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2. Polyarticular JIA
<ul>
<li>Key features: Inflammation in 5 or more joints within the first 6 months, which may involve both large and small joints. Commonly affected joints include wrists, small joints of the hands, and knees.</li>
</ul>
<ul>
<li>Subtypes</li>
</ul>
<ul>
<li>RF-positive: Usually more severe symptoms, similar to adult rheumatoid arthritis.</li>
<li>RF-negative: Symptoms may be less severe but still require long-term monitoring.</li>
</ul>
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3. Systemic JIA is one of the two most common types in Thailand.
<ul>
<li>Key features: Besides joint inflammation, there are multiple systemic symptoms such as intermittent high fever, pale pink rash appearing with fever, enlarged liver, spleen, and lymph nodes.</li>
<li>Important complications: Risk of Macrophage Activation Syndrome (MAS), a severe complication requiring urgent care, as delayed diagnosis can be life-threatening.</li>
</ul>
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4. Enthesitis-related JIA is one of the two most common types in Thailand.
<ul>
<li>Key features: Inflammation at the sites where tendons and ligaments attach to bones, such as the heel, Achilles tendon, and hips. It mostly occurs in boys over 6 years old and is often associated with the HLA-B27 genetic marker. Family history may include diseases related to HLA-B27, such as ankylosing spondylitis and psoriasis.</li>
</ul>
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5. Psoriatic JIA
<ul>
<li>Key features: Presence of psoriasis on the skin or a family history of psoriasis. May have nail abnormalities (pitting nails) along with joint inflammation affecting both small and large joints.</li>
</ul>
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6. Undifferentiated JIA
<ul>
<li>This group does not clearly fit the criteria of any specific type or has overlapping features of multiple groups, such as symptoms resembling both oligoarticular and psoriatic types.</li>
</ul>
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<h2>Treatment Approaches</h2>
The main goals of treatment are to reduce inflammation, prevent joint damage, and help children live as close to normal life as possible. Treatment depends on the type of JIA and includes:
&nbsp;
<ol>
<li>Anti-inflammatory drugs (NSAIDs): Help relieve pain and reduce joint inflammation.</li>
<li>Immunomodulatory drugs (DMARDs): Such as Methotrexate</li>
<li>Biologics: Used in cases resistant to other treatments.</li>
<li>Steroids: May be used in some cases for rapid inflammation control but must be closely monitored by a doctor.</li>
<li>Physical therapy and appropriate exercise: To prevent joint stiffness and strengthen joints.</li>
<li>Comprehensive care: Including nutrition, psychological support, and assistance with the child’s learning.</li>
</ol>
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<h2>Long-term Care and Complications</h2>
If not properly treated, long-term effects may include:
<ul>
<li>Joint deformities or disabilities</li>
<li>Abnormal growth of bones and muscles</li>
<li>Eye inflammation (uveitis), which can lead to blindness if not detected early</li>
<li>Reduced quality of life due to joint pain and limited mobility</li>
</ul>
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Regular follow-up with a doctor is important to adjust treatment appropriately and prevent complications.
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Juvenile Idiopathic Arthritis (JIA) is a disease caused by immune system abnormalities, leading to persistent joint inflammation. Although there is no specific prevention, if parents notice their child has swollen, painful joints or abnormal joint movement, they should bring the child to see a doctor for early diagnosis. Proper and continuous treatment will help the child develop, learn, and live as close to normal as possible.

Juvenile idiopathic arthritis (JIA) is a chronic, persistent, and inflamed condition in which the immune system malfunctions, causing joint swelling, pain, morning stiffness, or stunted growth in children. If not treated properly, serious complications can occur.

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What is juvenile idiopathic arthritis (JIA)? Symptoms, causes, and treatment methods that parents need to know.

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