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I don't know what you are talking about definitions-wise here. Things can definitely be accute and not severe. This is easily resolved by looking at a dictionary.

"acute" is paired with "chronic" and indicates onset, not severity.

So…CARS?

Something can't be both chronic (persisting over a long time) and acute (coming all at once). But some diseases can be both chronic and severe, like AIDS.

Pins and needles is usually acute, and harmless

Chronic pins and needles should be checked urgently by a doctor as it's very serious