Acute bronchitis is an infection that leads to inflammation and increased mucus production in the lungs. The symptoms may be similar to other respiratory illness—coughing, shortness of breath, wheezing, or chest tightness or pain are all common symptoms of acute bronchitis. 
A persistent cough is the most common symptom that indicates bronchitis—the cough may or may not be productive, and if it is, the sputum (mucus or phlegm) expelled may be yellow or greenish or clear.  Other non-respiratory symptoms include fatigue or tiredness, and slight fever or chills.  It is common for acute bronchitis to onset alongside or just after having a cold, flu or other respiratory virus or infection.  Nasal congestion or sinusitis may also accompany or lead to developing acute bronchitis.