Exterior, Excess and Heat are classified as Yang in nature so in the context of the Eight Principles any pattern that is located in the Exterior, is an Excess or is Hot will be Yang in Nature. As such Yin and Yang are general terms that can be used to describe most pathological conditions.
That being said Yang also has some conditions of its own, specifically Yang Deficiency and Yang Collapse.
The main characteristic of Yang Deficiency as a condition is the lack of Heat and activity to perform adequate functions in the body.
The resulting symptoms are: a pale face, a weak voice, slight sweating during daytime, slight shortness of breath, tiredness, lack of appetite, chilliness, a bright pale face, cold limbs, no thirst, a desire for hot drinks, loose stools, frequent pale urination, a Weak pulse and a Pale and wet tongue.
Qi is part of Yang, and Qi Deficiency is similar in nature to Yang Deficiency . In fact, the two are almost the same. The only difference is that in Qi Deficiency, the Qi function of transformation is mostly at fault, while in Yang Deficiency, it is the Qi function of warming and protecting that is impaired.
The main symptoms are chilliness, cold limbs, weak breathing, profuse sweating with an oily sweat, no thirst, frequent profuse urination or incontinence, loose stools or incontinence, a Minute-Deep pulse and a Pale-Wet-Swollen-Short tongue.