Patients with dry nose and dry mouth may be caused by dry climate, atrophic rhinitis and dry syndrome. 1. Dry climate: when the weather is dry, low humidity in the environment, irregular diet, drinking less water may also appear dry mouth and nose. 2. Atrophic rhinitis: patients with atrophic rhinitis will have dry nasal mucosa, poor mucosal secretion, abnormal mucosal sensation, etc. The nasal mucosa loses its humidifying function to the air, and the function of cilia on the surface of the mucosa will be affected, which results in dry mouth, dry nose, dry scabs and other symptoms. 3. Dry syndrome: dry syndrome is a chronic inflammatory autoimmune disease, which is mainly manifested in the oral cavity, eyes, nose, trachea, vagina and other mucous membrane parts, secretion reduction, so that the patient may have a dry mouth, dry nose, dry eyes and other manifestations. It is recommended that patients with dry nose and dry mouth should seek medical examination in time to clarify the cause of the disease and then carry out targeted treatment.