Coughing up green sputum is not a sign that the disease is getting better, it often indicates the presence of Pseudomonas aeruginosa infection. Pseudomonas aeruginosa can produce green secretions during multiplication, hence the green color of the patient’s sputum. Normal people occasionally have a small amount of white sputum or grayish-white mucous sputum. If people suffering from certain diseases cough green sputum with cough, chest tightness, shortness of breath, or even a gradual increase in body temperature, this situation not only does not indicate that the disease has improved, but also indicates that the disease has worsened, for example, patients with bronchitis may develop pneumonia or lung abscess after aggravation. Moreover, Pseudomonas aeruginosa is a strain that is more prone to drug resistance. If a patient develops this kind of sputum, he or she needs to promptly do sputum culture and drug sensitivity tests to clarify the antibiotics to which he or she is sensitive, select the appropriate antibiotic treatment, and give comprehensive treatment such as bronchodilators and sputum-reducing drugs. During the period of illness, patients are advised to exercise properly, pay attention to keeping warm and avoid getting cold, and they should ensure good sleep and a nutritious and balanced diet structure to enhance physical fitness and improve cardiopulmonary function.