The ancient Egyptians built irrigation channels from the Nile to take water to the surrounding land. They knew it was important to keep these systems clear of blockages, or the land would return to desert. This gave the Egyptians a natural theory on how disease was caused. They knew there were vessels around the body that carried blood, air and urine and thought that disease was caused by these vessels getting blocked, which led them to blood letting.
This was the first natural explanation of disease.
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