Chronic condition
A chronic condition was a medical condition that recurred often or lasted a long time.

In 2369, Krax described his father Zek's (supposed) cause of death as an infection of the tympanic membrane, a chronic condition. ()

In 2375, after Kathryn Janeway remarked on a recovering B'Elanna Torres's Klingon temper having returned, The Doctor replied that "it practically qualifies as a chronic condition". ()

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Medical conditions