Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Asthma ?
    ### Response:
    Asthma is a breathing disorder that affects the airways. People with this condition experience recurrent swelling and narrowing of the airways of the lungs which is associated with wheezing, shortness of breath, chest tightness, and coughing. Most affected people have episodes of symptoms ("asthma attacks") followed by symptom-free periods; however, some may experience persistent shortness of breath in between attacks.
    