Yin deficiency and internal heat can usually be divided into liver yin deficiency and internal heat, kidney yin deficiency and internal heat, stomach yin deficiency and internal heat, etc. Patients are advised to judge the corresponding symptoms according to the different situations. Liver yin deficiency and internal heat: Liver yin deficiency and internal heat is usually caused by the deficiency of yin in the liver. Symptoms often include bitter mouth and dry throat, dry stools, night sweating (sweating abnormally after going to sleep, but sweating stops after waking up), heat in the five hearts (heat in the heart of the hands and feet, and self-consciousness of heat in the heart and chest), and dryness in the eyes. Kidney yin deficiency and internal heat: Kidney yin deficiency and internal heat is mainly manifested as night fever, hot flashes (a burst of heat), etc. Symptoms are often manifested as night sweating (sweating abnormally after going to sleep, but sweating stops after waking up), hot hands and feet, dryness of the mouth and yellowish urine. Stomach yin deficiency and internal heat: The main manifestation of stomach yin deficiency and internal heat is stomach discomfort, such as indigestion, hidden pain in the stomach, hunger, no appetite, and noisy in the stomach (a feeling similar to hunger and emptiness with burning in the stomach). Patients should go to the hospital in time if any of the above maladies occur, so as not to aggravate the condition.