Cold • Symptoms onset; Gradual • Fever; Rare • Ache; Mild • Chill; Uncommon • Fatigue; Sometimes • Weakness; Sometimes • Sneezing; Common • Chest discomfort; Mild to moderate • Cough; Mild to moderate • Stuffy nose; Common • Sore throat; Common • Headache; Rare Flu • Symptoms onset; Abrupt • Fever; Usual • Ache; Usual • Chill; Common • Fatigue; Usual • Weakness; Usual • Sneezing; Sometimes • Chest discomfort; Common • Cough; Common • Stuffy nose; Sometimes • Sore throat; Sometimes • Headache; Common