In the 1800s, what was the popular medical explanation for the cause of sickness?

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In the 1800s, the prevailing medical Explanation for the cause of sickness was the theory of bad or corrupted fluids in the body, which was based on the ancient Greek concept of humors. Doctors believed that imbalances in four bodily fluids (blood, phlegm, black bile, and yellow bile) caused illness, and treatments often involved bleeding, purging, or inducing vomiting to restore the balance of fluids.

In the 1800s, What Was the Popular Medical Explanation for the Cause