The upper respiratory system includes the ears, nose, sinuses, mouth, and throat. When a person suffers from the common cold or the flu, which result mostly from the respiratory syncytial virus, the upper respiratory system is involved causing an upper respiratory infection (URI).
Symptoms:
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runny or stuffy nose
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loss of appetite
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sore throat
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muscle aches
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fever
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cough
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headache
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ear pain
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