Fever
Chills
Fatigue
Body aches
Headache
Cough
Sore throat
Runny nose
Congestion
Sneezing
Nausea
Vomiting
Diarrhea
Rash
Loss of appetite
Swollen lymph nodes
Shortness of breath
Loss of taste or smell
Symptoms that start suddenly
Symptoms after exposure to someone sick
Positive test result for a virus
Worsening symptoms over time
Symptoms lasting more than a few days
Medical evaluation confirming a viral infection