Signs:
Weak breathing, shortness of breath on exertion
The Lungs govern respiration
Weak cough
Lungs are too weak to send Qi downward
Thin watery sputum
Lung Qi too weak to regulate water passages
Weak voice, lack of desire of speaking
Weak Zong Qi
Spontaneous sweating, easily sweats, daytime sweating
Lungs circulate Wei Qi which governs the opening and closing of skin pores
Aversion to Cold
Lungs and Wei Qi warm the skin and muscles
Bright white complexion
Qi Deficiency
Weakened Immunity
Weak Lung Qi is also closely tied to weak Wei Qi, which could lead to frequent colds.

Etiology/Pathology
Chronic Lung problems may be hereditary, especially if a parent had Lung tuberculosis. There may be transverse cracks in Lung area and the Lung's pulse position may be more medial than normal.

Exterior Wind Cold or Wind Heat may remain in the body and eventually cause Lung Qi Deficiency. There is often a chronic cough following an exterior Wind Cold or Wind Heat invasion. This situation can be worsened when taking antibiotics for cold or flu, as they contain the Cold in the chest and interfere with Lung's dispersing & descending functions.