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Unspecified juvenile idiopathic arthritis is a rare, pediatric, rheumatologic disease, a subtype of juvenile idiopathic arthritis (JIA) characterized by arthritis of an unknown cause that persists for at least 6 weeks, and does not fulfill the criteria for any of the other JIA subtypes, or fulfills criteria for more than one of the other subtypes.
Biomarker and diagnostic research for unspecified juvenile idiopathic arthritis has been reported in the published literature.
Estimated prevalence: Unknown (Unknown prevalence).
No clinical trials have been registered for unspecified juvenile idiopathic arthritis.
8 publications have been identified in PubMed for unspecified juvenile idiopathic arthritis. Kisho has analyzed 6 by research type. Research spans Case Report / Case Series (33%), Epidemiology / Natural History (33%), and Diagnostic / Biomarker (17%).
Pitkänen V (2026). [PMID: 40976864](https://pubmed.ncbi.nlm.nih.gov/40976864/). *Arthritis & rheumatology (Hoboken, N.J.)*. [Diagnostic / Biomarker]
Min EJ (2025). [PMID: 40491085](https://pubmed.ncbi.nlm.nih.gov/40491085/). *J Korean Med Sci*. [Epidemiology / Natural History]
Rezel-Potts E (2024). [PMID: 38722334](https://pubmed.ncbi.nlm.nih.gov/38722334/). *European journal of pediatrics*. [Epidemiology / Natural History]
Wu DW (2024). [PMID: 39325256](https://pubmed.ncbi.nlm.nih.gov/39325256/). *Clin Exp Med*. [Review / Meta-Analysis]
Zhao J (2024). [PMID: 38292070](https://pubmed.ncbi.nlm.nih.gov/38292070/). *J Transl Autoimmun*. [Case Report / Case Series]
Data assembled from 3 of 12 sources · Last updated Sep 19, 2026, 8:39 PM UTC
European rare disease database
Genetic and Rare Diseases Info Center
Van Heerde WS (2024). [PMID: 39742187](https://pubmed.ncbi.nlm.nih.gov/39742187/). *Cureus*. [Case Report / Case Series]