Catatonic homeless man frozen motionless in middle of busy intersection

Catatonic schizophrenia is a subtype of schizophrenia that experts now consider obsolete. Experts no longer recognize it as a specific condition, and instead, attach catatonia as an additional feature when diagnosing schizophrenia. Catatonia is sometimes dangerous, but is usually very treatable with medication or other methods like electroshock convulsive therapy (ECT).

A behavioral syndrome marked by an inability to move normally.

It can be associated with schizophrenia and other mental illnesses.

Catatonia may involve symptoms such as staying still, fast or strange movements, lack of speech, and other unusual behavior.

Treatment includes tranquilizer medications like lorazepam (ativan) and diazepam (valium), or electric shock (electroconvulsive) therapy.

https://my.clevelandclinic.org/health/diseases/23499-catatonic-schizophrenia