The common cold is usually caused by a viral infection. Lots of viruses can take hold inside your nose, mouth, throat or lungs, and cause cold symptoms. Colds usually last 3 to 7 days in adults and 10 ...

Influenza (the flu) is a common, infectious virus spread by droplets ... The symptoms of COVID-19, the flu, and a cold have some overlap but are often different. As a rule, flu and COVID-19 ...