There were supposedly four humors (black bile, yellow bile, blood and phlegm). When someone was sick, the four humors must have been out of balance and to heal, the four humors had to be balanced again.
The use of leeches in medicine dates 2,500 years, when they were used for bloodletting in ancient India An imbalance in the proportions in the four humors; blood, phlegm, black bile and yellow bile, was believed to cause ill-health. The practice of bloodletting with leeches was believed to correct it.
It was believed that most illnesses were contained in the bodies humors (fluids) and so by letting blood out of the body it was also thought to let the illness out of the body.
earth, water, fire and air
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Egyptian
yes
Galen learned from doctors such as Hippocrates about the four humors.
Hippocrates, a greek doctor, in 460-377 BC
Hippocrates believed that the human body was controlled by four humors, phlegm, black bile, yellow bile and blood. Illnesses were caused by an imbalance of the humors.
fingers, toes and butt fingers, toes and butt
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