noun
a word used to identify any of a class of people, places, or things
adjective
a word that describes or modifies a noun
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The patient's symptoms may be exacerbated by an underlying condition.
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The reason you keep feeling sick might be because of an underlying condition.
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Dude, your constant fatigue could be due to some underlying condition.
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Just like a hidden iceberg, an underlying condition can cause serious health issues if left untreated.