Question

if the natural history of an illness involves full __________ within a limited period, irrespective of intervention by a health care provider, such intervention is not needed unless it is likely to improve the patients quality of life during the recovery period.

Explanation:

The context is about the natural course of an illness. When an illness can resolve on its own (full recovery) within a certain time without the need for medical intervention (unless for quality - of - life improvement), the key word related to the illness getting better is "recovery".

Answer:

recovery