The first symptoms of<unk>  are usually muscle cramps and tremors, fever, symptoms of autonomic nervous system instability such as unstable blood pressure, and sudden changes in mental status (agitation, delirium, or coma). Once symptoms appear, they may progress rapidly and reach peak intensity in as little as three days. These symptoms can last anywhere from eight hours to forty days. Symptoms are sometimes misinterpreted by doctors as symptoms of mental illness which can result in delayed treatment.<unk>  is less likely if a person has previously been stable for a period of time on antipsychotics, especially in situations where the dose has not been changed and there are no issues of noncompliance or consumption of psychoactive substances known to worsen psychosis. * Increased body temperature >38 °C (>100.4 °F), or * Confused or altered consciousness * sweating * Rigid muscles * Autonomic imbalance
Neuroleptic malignant syndrome
Malignant hyperthermia
Limbic encephalitis
Catatonia
Viral encephalitis
Serotonin syndrome
Oculogyric crisis
Heat stroke