When Immune Antibodies Turn Against the Brain
In rare instances, the immune system produces antibodies that attack brain tissue, leading to autoimmune encephalitis and symptoms such as hallucinations or psychosis. These cases can be mistaken for schizophrenia, but they may respond to treatments that suppress the immune system, including plasma exchange, rather than standard antipsychotics. Researchers are trying to improve identification of such patients and refine therapies.
In autoimmune encephalitis, the body’s defensive proteins can mistakenly bind to brain tissue, causing inflammation. This uncommon condition can produce hallucinations, delusions, agitation and other psychotic features, so patients may first be seen by psychiatric services.
A 2007 report described 12 women with the illness; nine first showed symptoms resembling psychosis. Diagnosis often relies on antibody tests in blood or spinal fluid, MRI inflammation, seizures, or rapid worsening. Some cases lack obvious neurological signs, making them easy to miss.
Better recognition of antibody-driven brain inflammation could help a small subset of people with sudden psychosis receive immune-focused care instead of ineffective antipsychotics, potentially changing outcomes for patients and families. Broader screening may also raise costs, anxiety, and false hope if cases are overidentified, while most people with psychosis still need standard psychiatric treatment. Clinicians and researchers may need to balance earlier testing against careful diagnosis.