Cold phlegm in the mouth may be a dietary problem (cold food intake, need to adjust the diet structure), may also be caused by disease (such as laryngitis, need to anti-infection and other symptomatic treatment), need to be analyzed specifically. 1. Dietary problems: excessive intake of cold food, such as cold drinks, cold food, etc., will appear in the mouth of phlegm cold symptoms, need to adjust the diet structure, reduce the intake of cold food, eat more fruits, vegetables, drink more warm water. 2. Disease problems: laryngitis, the inflammation of the throat can also lead to the mouth phlegm cold, may also be accompanied by sore throat, pharyngeal foreign body sensation and other symptoms, the examination can be seen in the pharynx red, swollen, etc., routine blood tests can be seen in the white blood cells, neutrophil counts are elevated, need to be in the guidance of the doctor to carry on the anti-infective treatment (eg, penicillin, cefixime, etc.), and so on. The coldness of phlegm in the mouth may be due to dietary problems or diseases, it is recommended to consult a doctor in time, under the guidance of the correct treatment. Drugs should be used in accordance with medical advice.