Yin deficiency internal heat may be characterized by hot flashes, nighttime heat, or five heart-fevers (heat in the hearts of the hands and feet, and self-consciousness of the heart and chest (irritability and sultriness)), among other symptoms. Yin deficiency internal heat, also known as Yin deficiency fever, mainly manifests as hot flashes, night fever, or five heart-heat, and is often accompanied by night sweats (abnormal sweating after going to sleep, but sweating stops after waking up), dry mouth, red tongue, and a fine pulse (a pulse that becomes narrower and finer, and increases in rate), and so on. Clinically, drugs commonly used to treat Yin deficiency and internal heat include Tianwangxin Tonic Dan, Nourishing Yin and Clearing Lung Pill, Qi Ju Di Huang Pill, Zuo Gui Pill, etc., but the specific medication should be decided by the doctor according to the patient’s condition. If you have any of the above symptoms, it is recommended that you seek medical attention promptly.