noun
a physical or mental feature which is regarded as indicating a condition of disease, particularly such a feature that is apparent to the patient
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The most common symptom of the flu is a high fever.
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If you're feeling really tired and achy, that's a symptom of the flu.
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Having a pounding headache is a major symptom that you might have a migraine.
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Procrastination can be a symptom of a deeper issue, such as fear of failure.