Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Acute Bronchitis ?
    ### Response:
    Bronchitis is an inflammation of the bronchial tubes, the airways that carry air to your lungs. It causes a cough that often brings up mucus. It can also cause shortness of breath, wheezing, a low fever, and chest tightness. There are two main types of bronchitis: acute and chronic.
    