What causes colds?
Causes of the common cold are the rhino-viruses that well enter your body through the nose mouth or eyes and settle in your cells. These are so easy to pick up by a contaminated object of any kind that someone with the virus has touch. For more information see here: http://health.howstuffworks.com/question38.
Most colds are caused by viruses called rhinoviruses that are in invisible droplets in the air you breathe or on things you touch. More than 100 different rhinoviruses (the name comes from “rhin,” the Greek word for nose) can get through the protective lining of the nose and throat. This triggers an immune system reaction that can make the throat sore, cause a headache, and make it hard to breathe. No one knows exactly why people become infected with colds at certain times. But no matter what you hear, sitting or sleeping in a draft, not dressing warmly when it’s chilly, or going outside with wet hair will not cause someone to catch a cold.