Colds - Colds can occasionally lead to other infections, such as sinusitis, ear infection or bronchitis.⁷³

Flu - The most serious, often life-threatening complication of the flu is pneumonia.⁷⁴ Other complications include otitis media (ear infection), sinusitis, bronchial infections, and exacerbation disease, congestive heart failure and asthma. ⁷⁵

To help avoid any complications resulting from the flu, be sure to visit your doctor at the first signs of flu symptoms.