You're hearing mucus in the airway that gets 'rattled' by the air moving past it. Asthma attacks cause a lot of mucus production in the airways. After the Asthma attack is done, the mucus is still there, so an expectorant (such as guaifenesin) can be used to thin this mucus & lubricate the airways so the mucus can be expelled (coughed out) more easily. But it would be a good idea to talk with your doctor about
this to make sure there isn't something else contributing to your symptoms.
Gluten & Sulfite Sensitivity, Many Food/Inhalant/Medication Allergies & Intolerances, Asthma, Gut issues (dysmotility, non-specific inflammation), UCTD (Lupus?), Osteoporosis, Anemia, T- & B-Cell Lymphopenia, malabsorption/malnutrition, Lyme Disease (Igenex Lab IgM WesternBlot positive/CDC negative), etc.
Meds: Pulmicort, Injectable Vitamin B12, Herbs, Nutritional Supplements, Homeopathy.