In their bronchitis, the air passages connecting mouth with nose with the lungs have swelling and inflammation. Cough, wheezing, and breathing difficulties are signs of bronchitis. People may also have difficulties releasing their airways of thick mucus or phlegm. Acute or chronic bronchitis could be possible. Acute bronchitis typically clears itself, but persistent chronic bronchitis never clears up. Prevention of smoking can help to avoid this virus.