Unsteady gait in all cases
Postinfectious cerebellitis: 1-3 weeks post URI like illness or immunization, truncal<unk> and gait instability, normal mental status, normal vitals, ONLY<unk> Guillain Barre extremity<unk> more than truncal<unk>  areflexia or hyporeflexia, respiratory failure possible
Drug ingestion: altered mental status, eye findings (nystagmus)
Intracranial mass: headache, vomiting, gradual onset, visual changes, papilledema, focal neuro deficits
Meningitis/Encephalitis fever, meningismus, bulging fontanelle, rash, altered mental status, seizure
Ataxia 
Systemic conditions
Dysphonia
Intoxications with diminished alertness
Dysphagia
Ethanol
Diplopia
Sedative/hypnotic toxicity