The difference between heart fire and liver fire is mainly determined by symptoms. Liver fire refers to the liver function is due to hyperactivity, the fire and appear hot, often with love, diet or other internal organs, heat evil disturbing the liver meridian, etc., its main clinical manifestations for dizziness and distension, red face, red eyes, bitter mouth, dry mouth, irritability, constipation, urine short yellow color, and so on. Heart fire can be divided into real fire and imaginary fire. Real fire is often caused by feeling external evil (such as environmental dryness and sudden changes, etc.), excessive spicy food, alcohol, etc., mostly manifested as sores on the mouth and tongue, heartburn, fever, dry mouth and thirst, short urine, dry stools, etc.. Deficiency fire is mostly caused by emotional disorders, excessive fatigue, etc., manifesting as heartburn, easy fatigue, low-grade fever, sweating at night, waking up and stop sweating. The cause of the two and the affected organs are different, the performance is also different, in the specific identification also need to be combined with other symptoms and tongue and pulse to judge.