Chronic hiccup is a rare movement disorder characterized by involuntary spasmodic contractions of the inspiratory muscles synchronized with larynx closure lasting for more than 48 hours.

Seizures are an intermittent abnormality of the central nervous system due to a sudden, excessive, disorderly discharge of cerebral neurons and characterized clinically by some combination of disturbance of sensation, loss of consciousness, impairment of psychic function, or convulsive movements. The term epilepsy is used to describe chronic, recurrent seizures.