Here are two approaches, showing the way in which the Four pillars (Bazi) are connected to the human body parts. With some other indicators like the body symbolism of the heavenly stems and the earthly branches and by observing any imbalances between the elements in Bazi chart, one can get more understanding about the human health:
Dealing with the details some differences between various approaches could be found. The first pcture, for example, deals with the left and the right side of the standing body. As day pillar is the central pillar of our personality, one can also say, that the hour pillar is the right side, day pillar is the central part of the body, while month and year pillar are both connected with the left side of the body.
So, try to find out which system is the best for you.