Disease

A disease cannot take a hold without a host who accepts it, hence the current attempts to understand our immune system.

Greeks believed there was a fluid called Physis that flowed in and out and through all life.The flow of Physis tied all the organs inside the body with the world outside.

As long as the two were in balance the body would be healthy.

Physics out world and psysiology inner.
Balance of the three elements.
Dosha to maintain health.