Question: what causes the symptoms of viral diseases?
Answer: Flu-like symptoms (fatigue, fever, sore throat, headache, cough, aches and pains) Gastrointestinal disturbances, such as diarrhea, nausea and vomiting. Irritability. Malaise (general ill feeling) Rash. Sneezing. Stuffy nose, nasal congestion, runny nose, or postnasal drip.