12 Common Symptoms Of The Flu

2. Sore Throat

While sometimes caused by bacteria, a sore throat may also indicate a number of viral infections, one of which is the flu. It often appears at the beginning of a sickness, and is characterized by a scratchy, irritated or painful throat. The pain or discomfort caused by a sore throat often feels worse when swallowing. It may also make your voice hoarse, or you may even lose it completely in the duration of the infection.