More than 200 viruses can cause a cold, with rhinovirus being the most common. Influenza viruses—three of which infect humans—cause the flu. Both illnesses share symptoms like a runny nose ...
Learn more about how to tell the difference between the common cold and flu. Delsym vs Robitussin-DM: How Do They Differ? OTC Medications to Soothe a Sore Throat ...