Over a third of autistic kids having sudden, severe meltdowns actually had undiagnosed juvenile arthritis.
This study overturns the assumption that 'post-infectious deteriorations' in autistic children are purely psychiatric. It shows that many of these behavioral crises are actually caused by hidden physical pain and inflammation in the joints, suggesting many children are being given sedatives when they actually need arthritis treatment.
Autoimmunity and Arthritis in Youth with Autism and Suspected Post-Infectious Deteriorations
medRxiv · 10.64898/2026.03.19.26348838
The causes of severe neuropsychiatric deteriorations among patients with previously stable autism spectrum disorder (ASD) are poorly understood and present substantial challenges for care. We aimed to characterize the prevalence of autoimmune and inflammatory conditions and markers, as well as musculoskeletal findings, among youth with ASD experiencing a suspected post-infectious neuropsychiatric deterioration. The Stanford Immune Behavioral Health (IBH) Clinic is a specialty program for youth w