My father is suffering from dry cough from last 1.5 years we consult lot's of doctors for treatment but he don't get any relief and the reports are all always normal later we come to known about his asthma but still comsuming lots of medicine for asthma still he don't get any relief from cough i just want know is this normal in asthma or do we have chance to cure this thing because we are feeling helpless by the taking medicine and nebulizer they don't get any relief from cough. TheTB testnormal