White to yellow sputum may be the result of an acute bacterial infection, or it may be the result of an acute infection combined with your own chronic respiratory disease.
1. Acute bacterial infection. If the sputum is white in the beginning of the disease, and then becomes yellow, then the disease will be aggravated, usually due to secondary bacterial infection, which is manifested as yellow sputum.
2. Chronic respiratory system diseases caused by their own combined acute infections. Common bronchial dilatation, chronic obstructive pulmonary disease, etc., in the course of their own immunity is lowered, can be combined with lung infections, resulting in coughing, coughing yellow sputum increased, activity endurance decreased acute aggravation of symptoms.
Therefore, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for examination to clarify the cause of the disease, and at the same time, according to the doctor’s instructions for treatment.