Spit is white common cause of chronic inflammation of the airway, sputum is the trachea and bronchial cup cells as well as mucous glands secretion of liquid, play a wet airway, wrapped inhaled dust and microorganisms, and then with the movement of the cilia will be discharged out of the airway role, discharged liquid that is phlegm, stimulation of the bronchial tubes will lead to an increase in sputum, such as smoking, haze, and so on. Long-term chronic airway inflammation can also cause coughing up more white phlegm, such as chronic bronchitis, chronic obstructive pulmonary disease, etc., this does not require the use of antibiotics, you can take oral cough, phlegm medication, such as eucalyptus pinene, acetylcysteine and so on. In traditional Chinese medicine, white phlegm is called cold phlegm, mostly caused by cold stagnation, in the diet need to avoid eating cold food, avoid fish, shrimp, crab, and pay attention to warmth, appropriate exercise to strengthen the body.