Back To Top Symptoms Fever over 102 degrees F, generally lasts 3-5 days, and is often higher in the afternoons and evenings, with some decrease in the mornings. Fever typically runs higher in children and can be over 104 degrees F. Coughing starts as dry and hacking and progresses by the 3rd day to wet with thick mucous. The cough can worsen for the next 4-7 days and could last for over 2 weeks. This is the major symptom of influenza. Coughing in children can be croupy and serious.
Smokers are at risk for significant bronchitis and pneumonia.
Headaches and Muscle Aches can be severe for the first few days and will slowly improve. Fatigue is common and severe, lasting for 1-3 weeks. Sore Throat is most common in older children and adults. It can be severe for the first few days. Influenza is typically contagious for 5-7 days from fever onset.