Serotonin Syndrome
Serotonin syndrome more likely to have hyperreflexia, myoclonus, ataxia, nausea and vomiting, diarrhea
Rigidity and hyperthermia, if present, is less severe than in<unk> ; more commonly presents with clonus and hyperreflexia
Malignant Hyperthermia
Distinguish by clinical setting (use of inhalational anesthetics or sux)
Hyperthermia, muscle rigidity, and dysautonomia is similar to<unk>  though more fulminant
Anticholinergic Toxicity
Diaphoresis, rigidity, elevated CK are absent
Flushing, mydriasis, bladder distension are common
Sympathomimetics
Rigidity is not seen
Serotonin syndrome more likely to have hyperreflexia, myoclonus, ataxia, nausea and vomiting, diarrhea
Rigidity and hyperthermia, if present, is less severe than in<unk> ; more commonly presents with clonus and hyperreflexia
Distinguish by clinical setting (use of inhalational anesthetics or sux)
Hyperthermia, muscle rigidity, and dysautonomia is similar to<unk>  though more fulminant
Diaphoresis, rigidity, elevated CK are absent
Flushing, mydriasis, bladder distension are common
Rigidity is not seen
Chorea
Sydenham's chorea<unk> 
Serotonin syndrome
Hypocalcemia
Strychnine toxicity
Acute tetanus
Parkinson's disease
Mono amine oxidase inhibitor toxicity
Phencyclidine toxicity
Anti-NMDA receptor encephalitis
Huntington disease
Wilson's disease 
CVA
Schizophrenia
Psychotic agitation
Dementia
Lewy body dementia
Vascular dementia
Frontotemporal dementia
Dystonic reaction
Extrapyramidal reaction
Torticollis
Idiopathic movement disorder
Sydenham's chorea
Lewy body dementia
Vascular dementia
Frontotemporal dementia
Infectious
Sepsis
Meningitis
Encephalitis
Cerebral malaria
Brain abscess
Other<unk> 
Serotonin syndrome
Malignant hyperthermia
Sympathomimetic toxicity (cocaine, amphetamine, ketamine)
Anticholinergic toxicity
Heat stroke
Delirium tremens
Hypothalamic stroke
Pheochromocytoma
Thyroid storm
Sepsis
Meningitis
Encephalitis
Cerebral malaria
Brain abscess<unk> 
Serotonin syndrome
Malignant hyperthermia
Sympathomimetic toxicity (cocaine, amphetamine, ketamine)
Anticholinergic toxicity
Heat stroke
Delirium tremens
Hypothalamic stroke
Pheochromocytoma
Thyroid storm
Neuroleptic malignant syndrome
Serotonin Syndrome
Limbic encephalitis
Serotonin syndrome more likely to have hyperreflexia, myoclonus, ataxia, nausea and vomiting, diarrhea
Osmotic demyelination syndrome
Rigidity and hyperthermia, if present, is less severe than in NMS; more commonly presents with clonus and hyperreflexia
Posterior reversible encephalopathy syndrome
Malignant Hyperthermia