Yin collapse or yang collapse refers to a critical morbid state due to sudden and excessive loss of yin fluid or yang qi.

阴阳亡失指机体的阴液或阳气的突然大量亡失，导致生命垂危的一种病理状态。

The later refers to a morbid state marked by deficiency of both yin and yang resulting from yang deficiency that affects the production of yin fluid.

后者指阳气虚累及阴液的化生，从而形成以阳虚为主的阴阳两虚病理状态。

Yin collapse is frequently caused by superabundance of pathogenic heat or prolonged retention of pathogenic heat that scorches yin fluid, or by other factors that excessively consumes yin fluid.

亡阴常由热邪炽盛，或邪热久留，大量灼伤阴液所致，也可由其他因素大量耗损阴液而致。

The former refers to a morbid state marked by deficiency of both yin and yang resulting from yin deficiency due to loss of yin fluid that makes the production of yang qi deficient.

前者指阴液亏损累及阳气化生不足，形成以阴虚为主的阴阳两虚病理状态。