(HealthDay News) -- Bronchitis is a respiratory disease characterized by inflamed mucus membranes in the lungs.
The National Heart, Lung, and Blood Institute says common warning signs of bronchitis include:
Persistent cough lasting 10 days to 20 days.
Coughing up mucus, which may be clear, yellow or green. The latter two indicate a bacterial infection.
Wheezing when breathing, tightness in the chest or chest pain.
Shortness of breath, especially during exercise.
If you have any of these symptoms, you should visit your doctor without delay.