Syndrome of accumulation of pathogenic heat in lung refers to the syndrome due to loss of depuration of the lung resulting from exuberant pathogenic heat in the lung. This syndrome pertains to qifen syndrome in syndrome differentiation of wei, qi, ying and blood. This syndrome is usually caused by internal development of exogenous wind heat or accumulation of heat in the lung transforming from internal development of pathogenic wind cold.

Clinical manifestations:
Fever, cough, asthmatic breath, even flapping nose with hot breath, red swelling and pain of throat, chest pain, yellowish sticky sputum, or rusty sputum, or foul sputum mingled with blood, thirst, scanty urine, constipation, red tongue with yellow fur and fast pulse. These manifestations are usually seen in various respiratory tract infectious diseases (such as pneumonia, infectious common cold, acute bronchitis, lung abscess and bronchial asthma, etc.) as well as measles and scarlet fever etc.

Analysis of symptoms:
Fever is due to fumigation of internal heat; cough and asthma are due to invasion of pathogenic heat in the lung, loss of depuration of the lung and upper adverse flow of qi; flapping nose with hot breath is due to pathogenic heat invading the lung and stagnation of pulmonary qi; red swelling and pain throat is due to fumigation of pulmonary heat and stagnation of qi and blood; chest pain is due to pathogenic heat scorching the pulmonary collaterals; yellow and sticky sputum is due to pathogenic heat scorching fluid into sputum which mixes up with heat and moves adversely upward with pulmonary qi; rusty sputum is due to pathogenic heat impairing the pulmonary collaterals; foul sputum mingled with blood is due to phlegmatic heat accumulation in the lung, qi stagnation and blood coagulation as well as putrid muscles and blood; thirst, constipation and scanty urine are due to exuberant heat consuming fluid; reddish tongue with yellow fur and fast pulse are signs of exuberance of internal heat.
 
Key points for syndrome differentiation:
Fever, cough, asthmatic breath, chest pain and yellowish sticky sputum.