What causes coughing with yellow phlegm?

Coughing with yellow phlegm is generally caused by prolonged smoking, wind-heat感冒 (common cold due to wind-heat), pneumonia, bronchiectasis, or chronic bronchitis. If discomfort arises from any of these conditions, prompt medical attention is recommended to prevent worsening symptoms. Detailed explanations are as follows:

1. Prolonged smoking: Smoking can damage and inflame the respiratory mucosa, leading to coughing and production of yellow phlegm. Harmful substances in tobacco irritate the mucosa, increasing mucus secretion, while dyes and tar in smoke may contribute to the yellow coloration of the sputum. Reducing smoking may help alleviate these symptoms.

2. Wind-heat common cold: Wind-heat cold is a type of cold caused by external "wind-heat" pathogens, commonly presenting with fever, cough, and sore throat. During such infections, the respiratory mucosa may become inflamed or infected, resulting in yellow phlegm. Treatment may include medications such as Fengre Ganmao Granules, Ganmao Qing Capsules, or Compound Honeysuckle Granules, as advised by a physician.

3. Pneumonia: Pneumonia is a lung infection caused by bacteria, viruses, or other pathogens, often accompanied by fever, cough, and chest pain. Yellow sputum is a common symptom, reflecting the severity of respiratory infection and inflammation. Treatment should follow medical advice and may include antiviral or antibiotic medications such as Acyclovir Capsules, Cefalexin and Trimethoprim Tablets, or Ribavirin Tablets.

4. Bronchiectasis: Bronchiectasis is a chronic airway disease in which damaged respiratory mucosa, lung infections, and inflammation can lead to coughing and yellow phlegm. Chronic bronchitis is a common contributing factor. Treatment under medical supervision may involve antibiotics such as Cefixime Capsules, Ampicillin Capsules, or Azithromycin Capsules.

5. Chronic bronchitis: Chronic bronchitis is a persistent inflammation of the airways, often triggered by smoking or air pollution. Patients typically experience chronic cough with yellow phlegm, indicating ongoing airway inflammation and mucus production. Under a doctor's guidance, medications such as Roxithromycin Capsules, Penicillin V Potassium Tablets, or Amoxicillin Tablets may be used for treatment.

In daily life, maintaining a regular sleep schedule and engaging in moderate physical activity—adopting a healthy lifestyle—can support overall health.