In medicine, chronic is a term used for a medical problem that is ongoing or recurring such as epilepsy, diabetes and chronic fatigue. It may also mean of a long duration and is characterised by suffering.
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what does chronic mean
constant; habitual; inveterate: a chronic liar.
continuing a long time or recurring frequently: a chronic state of civil war.
having long had a disease, habit, weakness, or the like: a chronic invalid.