According to the five elements, if Earth is deficient then
Wood over-controls and is excess. Water is excess as it is under-controlled.
Metal doesn’t receive proper nourishment from Earth and Fire is drained by the
deficient Earth. 
Earth is the matrix and web within which all qi moves around.
If the web is weak, the qi moves too easily through it. 
Wood qi rises without resistance. We see heat and excess qi
in the head in the form of headaches and rashes in the chest and head.
Metal qi falls without resistance. When Earth is deficient, we can see a thickening of the
Earth web which can lead to constipation. The metal Qi has trouble descending through
the thickening and the bowels are obstructed. As the Earth yang gets more
deficient, the web may weaken and break up, at which point the Metal Qi falls
downward without resistance and we see explosive diarrhea.
Water is not controlled properly by spleen. Think of the
Earth qi as the baffles and honeycombs holding the water in place. When the
Earth Qi is weak, the Water falls downward in the body to it’s natural place
near the earth (earth/man/heaven). We see edema and swelling in the four limbs.
The transportation and transformation of fluids in the body is Earth holding Water
in it’s proper place. 
Image courtesy of Jenny Downing

 
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