White phlegm is usually a symptom caused by Lung Cold, but it can also be caused by other reasons, such as deficiency of Spleen Yang, and internal stagnation of water-dampness (water-dampness stays in the body). Lung Cold usually refers to the obstruction of the lungs by cold, which often leads to the condensation of fluids into phlegm, and may be characterized by coughing, coughing up white or clear sputum, running nose, and fear of cold. Lung heat is usually caused by the attack of heat, heat burning fluid, often coughing phlegm yellow and thick, dry mouth and thirst, dry stools and other symptoms. Therefore, coughing up white sputum is usually caused by lung cold. However, white phlegm can also be caused by insufficient spleen yang, or the spleen’s lack of healthy transportation, water and dampness, resulting in the accumulation of dampness into phlegm, which is committed to the lungs. Therefore, white phlegm is not only caused by lung cold. It is recommended that the patient should seek medical advice from a professional Chinese medicine practitioner for targeted treatment after diagnosis.