The common cold is a viral infection of your upper respiratory tract — your nose and throat. It can result from any one of more than 200 different viruses. But, the rhinoviruses and the coronaviruses cause most colds.
The common cold is very easily spread to others. It's often spread through airborne droplets that are coughed or sneezed into the air by the sick personColds can also be spread when a sick person touches you or a surface (like a doorknob) that you then touch.