Which external factors can block the function of the Upper Jiao?

The function of the Upper Jiao, which includes the lungs and heart and is responsible for the distribution of Qi and fluids, can indeed be obstructed by external factors, particularly exogenous pathogens such as Wind-Cold or Wind-Heat. These pathogens can invade the body, leading to an impairment of the functional energies within the Upper Jiao. Wind-Cold, for example, can cause symptoms like tightness in the chest, cough, and respiratory issues, while Wind-Heat may manifest as a rapid onset of fever, a sore throat, and a dry cough. These external pathogenic influences challenge the body’s defense mechanisms, leading to a blockage in its ability to perform its functions efficiently.

Other factors mentioned, such as Liver Qi stagnation, excessive consumption of cold foods, and emotional stress, can certainly impact the body's overall function and health but do not specifically act as external factors that block the Upper Jiao's function. Liver Qi stagnation is primarily an internal dysfunction that affects Qi flow. Similarly, while excessive cold foods can impair digestion and bodily warmth, they do not constitute an external invasion like Wind-Cold or Wind-Heat. Emotional stress can affect the organs, particularly the heart and liver, but it is categorized more as an emotional internal