Causes

• Main cause: colds and other viral infections
• Fever may be the only symptom for the first 12-24 hours (i.e., viral fevers). The onset of symptoms (runny nose, cough, diarrhea, etc.) are often delayed. In the case of Roseola, fever may be the only symptom for 2 or 3 days.
• The cause of the fever often can't be determined during the first 24 hours.
• Bacterial infections (e.g., Strep throat or urinary tract infections) also cause fever
• Teething does not cause fever