Why are some people prone to yin deficiency and excessive internal heat?

Oct 11, 2022 Source: Cainiu Health
Disease description:

That day I went to the hospital for a checkup and was told I have yin deficiency with hyperactivity of fire. I just want to know how this condition develops—why are some people more prone to yin deficiency with fire excess?

Doctor's answer (1)
Dr. He Haochen
Yin deficiency with hyperactivity of fire is caused by long-term staying up late, illness, etc., and may also be triggered by a prolonged preference for spicy and stimulating foods, hyperthyroidism, diabetes, hypertension, and other conditions. Yin deficiency with hyperactivity of fire refers to diseases such as kidney yin deficiency and liver yin deficiency. This occurs when excessive internal heat consumes body fluids, or in individuals with a constitution prone to yin deficiency, where insufficient yin fluids fail to balance an overabundant yang, leading to the manifestation of "fire."