My child has a cough every month. It lasts for a week. Whenever he has a cold, he starts coughing. The doctor tells him to give him a nebulizer. Earlier, we used to nebulize him and he would get better. After some time, the cough starts again. We also got a lung test done, that too is fine. But now the doctor has asked to give him an inhaler. Now he is giving the child an inhaler. Is this a sign of asthma?