The differentiation of Exterior and Interior is not made on the basis of what caused the condition, but on the basis of the location of the disease. The Exterior mainly refers to skin, muscles and channels, while the Interior refers to deeper levels such as internal Organs.

When the Exterior patterns are not cured completely, the external Pernicious Influences can penetrate further into the Interior Organs. The Half Exterior and Half Interior pattern happens during this transforming stage. It explains the typical manifestation of cold and hot feeling rotation.

Any Lesser Yang diseases are half Exterior half Interior according to the Six Stages Theory. That the Evils has left the Great Yang Stage, but haven't enter the Yang Bright Stage.

This pattern impairs the Gallbladder Channel function, hence the symptoms of chest fullness and distention as well as bitter taste in the mouth.

It also causes Heat in the Gallbladder and disharmony between the Liver and Stomach, therefore the patients develops the symptoms of restlessness, anxiety, feeling of vomiting, poor  appetite and dizziness.