What does "Flu" mean in a report or doctor's letter? In our medical dictionary, you will find a patient-friendly explanation of the meaning of this medical term.
"Flu" is a short term for influenza, a common illness that affects the respiratory system, which includes the nose, throat, and lungs. It is caused by a virus and is highly contagious, spreading from person to person through tiny droplets when an infected person coughs or sneezes. Symptoms often include fever, cough, sore throat, body aches, and fatigue. It usually occurs seasonally, most commonly in the winter months.
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