Coughing up white sputum may be due to upper respiratory tract infection, chronic bronchitis, bronchiectasis, left heart insufficiency and other causes.
1. Upper respiratory tract infection: bacteria, viruses and other infections of the mucous membrane of the upper respiratory tract, resulting in a local inflammatory response, the body through the immune response against pathogens, and thus the formation of white sputum discharge.
2. Chronic bronchitis: smoking, exposure to dust, infection, immune disorders and other factors cause chronic inflammatory lesions of the bronchial tubes, thus coughing up white sputum.
3. Bronchiectasis: this disease may be related to genetic, immunodeficiency, cystic fibrosis, α-antitrypsin deficiency and other factors, repeated coughing, coughing up sputum.
4. Left heart insufficiency: due to the left ventricular contraction disorder, resulting in reduced ejection of blood, there is a stagnation of the pulmonary circulation, manifested by sitting breathing, coughing white plasma foam sputum and other symptoms.
Coughing up white sputum may be related to a variety of factors, it is recommended to seek medical advice to clarify the diagnosis.