Mouth and nose sores may be caused by heart fire, lung fire, stomach fire and other reasons. 1. Heart fire: heart fire mainly refers to the heart heat and fire, there is a distinction between the real and the imaginary. The heart is the official of the monarch, the main blood vessels, and the main spirit, and its openings in the tongue. So the heart fire is often distracted, insomnia, mouth and tongue sores, gum swelling and pain as the main clinical manifestations, mouth and nose sores may be caused by heart fire. 2. Lung fire: Lung fever is mostly caused by external evils that invade the lungs or lung meridians, the lungs and the mouth and nose are part of the body’s respiratory organs, and their qi is fundamentally interconnected. If the lung fire is exuberant, it can be manifested through the mouth and nose, which may be manifested as sores on the mouth and nose. 3. Stomach fire: the mouth is the door of the stomach, the mouth and nose are connected to each other, and are located in the upper part of the body. If the stomach fire is too large or long-term eating dry, frying and other easy to fire food, stomach heat will be too much. This may lead to symptoms such as sores in the mouth and nose. The Foot Yangming Stomach Meridian also runs around the mouth and nose, and excessive stomach heat may also lead to sores on the part of the meridian that runs around the mouth and nose. When a patient develops sores in the mouth and nose, it is recommended to go to the hospital as soon as possible and use the corresponding medication as prescribed by the doctor.