Dry mouth is a Yin deficiency and fear of cold is a Yang deficiency. So fear of cold and dry mouth should be the symptoms of yin and yang deficiency. Fear of cold and dry mouth, should be timely to the hospital to avoid long-term damage to the body serious. You should also be careful not to eat too spicy, greasy and stimulating food, which can aggravate the problem of yin and yang deficiency. Yin deficiency refers to the symptoms manifested by the lack of Yin fluid in the body, including dry stools, dizziness, tinnitus, heartburn (heat in the hearts of the hands and feet, and self-consciousness of the heart and chest), insomnia and dreaminess, night sweating (abnormal sweating after going to sleep, and waking up to stop the sweating), emaciation, dry mouth and tongue, dry skin, sputum, no nasal discharge in nasal congestion, or yellow nasal discharge and other manifestations. Yang deficiency refers to the lack of yang qi in the human body, resulting in the inability to warm the limbs and bones, and its manifestations include cold stomach, cold limbs, light mouth, thirst, hot drinks, spontaneous sweating (involuntary sweating during the daytime, and sweating is aggravated by the slightest movement), long and clear urination or urinary edema, and so on.