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Catatonia is a disorder that disrupts how your brain works, disrupting how a person processes and reacts to the world around them. People with catatonia often don’t react to things happening nearby or may react in ways that seem unusual. Impaired communication, unusual movements or lack of movement, and behavior abnormalities are the most striking features of this condition.

Researchers have studied catatonia since German psychiatrist Karl Kahlbaum named and described it in 1874, but it remains highly underdiagnosed. Part of this is because, until recent decades, catatonia was mistakenly believed to only occur in people with schizophrenia. Further challenges to diagnosis include disagreement within psychiatry on how many criteria and which criteria are required to diagnose catatonia. In addition, some catatonic signs, such as agitation and mutism, overlap with other conditions.