Ancient Greeks thought everyone had a mix of 4 humours in their body
Hippocrates and Galen's ideas were respected - still used 1000 years later
Black bile, phlegm, blood and yellow bile were the 4 humours
People became ill because this mix was unbalanced
The theory of opposites was further developed by Galen and inspired many treatments (balance the humours by giving the patient the opposite of their symptoms)
Fewer people began to believe in religious or supernatural causes - various new explanations for disease were suggested (seeds in air spreading disease)
Fewer people believed astrology caused disease
Due to improved knowledge of digestion, physicians realised urine was not a good indicator of disease and stopped using it
Physicians carried out more direct observations and examinations of patients