Why do we get sick? - HowStuffWorks - 2 views
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As an example, think of a person who has a cold. That person may cough into his or her hand and then touch a doorknob, thus placing the cold virus on that doorknob. The virus may die on the doorknob, but it's also possible that the next person to touch the doorknob will pick it up. If that person then touches food with the unwashed hand and consumes the food, the virus is now inside the body.
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The earliest physicians thought that illness and disease were a sign of God's anger or the work of evil spirits. Hippocrates and Galen advanced the concept of humorism, a theory which held that we get sick from imbalances of the four basic substances within the human body, which they identified as blood, phlegm, black bile and yellow bile. Paracelsus, a Renaissance-era physician, was one of the first to posit that sickness comes from outside sources, rather than from within.Today, we know that there are two major kinds of diseases: infectious and non-infectious.
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For example, if a person has gotten a cold and sneezes into their hand, then suddenly they touch the light switch, They leave the cold there, it may also be that the cold virus dies there, but it may also be that the next person who touches the light switch gets it in their hands. If they go to eat, and they don't wash their hands and they touch what they are going to eat they get it in their mouth and now they have the cold.
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