A cold is caused by any one of
several viruses that causes inflammation of the membranes that line the nose and throat.
It can result from any one of more than 200 different viruses. But, rhinoviruses cause
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 person. The droplets are then inhaled by another person. Colds can also be spread when a sick person touches you or a surface (like a doorknob) that you then touch.
Contrary to popular belief, cold
weather or being chilled doesn't cause a cold. But more colds do occur during the cold
season. This is early fall to late winter. This is probably because of a variety of
- Schools are in session, increasing the risk for exposure to the virus
- People stay indoors and are in closer
proximity to each other
- The air during cold season has low
humidity. This causes dry nasal passages, which are more susceptible to cold