This is a psychological expression. Heart fire can be divided into virtual fire and real fire. Virtual fire mainly shows upset, dry mouth, night sweats, restless sleep and thirst. Excess fire is manifested as oral ulcer, dry mouth, yellow urine, upset and irritable. Solution to excessive internal heat

Commonly used traditional Chinese medicine for nourishing yin

Radix Asparagi, Radix Ophiopogonis, Radix Scrophulariae, etc

Commonly used powder for clearing heat and purging fire

Rhubarb, coptis root, phellodendron bark, etc.