CLEAR INTERNAL HEAT
a) Quench Fire  
When External pathogenic factors penetrate through the Wei level into the Qi level, there is high fever. Sweating is no longer effective. The movement from the exterior to interior is also an indication of the increasing chronicity  of the disease.
    The coolest herbs in the materia medica are used to clear excessive Heat in this level, which manifests as high fever, irritablitly, thirst and delirium, sweating, scanty dark urine, yellow dry coating on the tongue, full and forceful pulse.
These herbs may also be used for  Internal Heat of any other cause. Yin nourishing herbs are added for Empty internal heat.
The mention of Fire in this category indicates that the Internal Heat is flaring, and perhaps rising upwards in the body.
b) Cool Blood
c) Dry Dampness
d) Neutralise Toxins
    These herbs have the action of clearing away pathogenic fire and Heat and subduing pyogenic infections. They are mainly indicated for syndromes caused by pathogenic Heat, such as epidemic febrile diseases, sores and carbuncles, furuncles and swelling, erysepelas, maculas and eruptions, swollen and sore throat, mumps etc.
Since all these herbs have cool or Cold properties, it is anadvisable to use them for Cold syndromes.
e) Clear Summer Heat
This category treats Internal heat and Dampness associated with Hot and Damp environments, manifesting as Headaches, dislike of heat, persiration, nausea vomiting and diarrhea. Thirst Lethargy/irritability. Tongue -Red bodies with yellow coat and a rapid pulse. These herbs have an antipyretic and diuretic action, and also function to produce fluids.
f) Deficient Heat - Five Hearts Hot (Soles of Hands and Feet and Face/Chest) Sore thorat, light and intermittant fever, dryness of mouth and throat (indicating body fluids are depleted). Mental irritability, fast and thin pulse and no coat on red bodied tongue.