Hi. I understand your concerns. He might be having asthma exacerbation due to infection. He will need to undergo a detailed examination and investigations like chest x ray to look for infection. if it's normal then you will need to undergo pulmonary function test which is needed for diagnosis and also to assess severity of asthma based on which treatment can be started. if you are from bangalore you can consult me at my clinic at hebbal kempapura. Hope your questions were answered. Thanks.

You will need to get all the previous reports and present reports along with xray and pft. A pulmonary physician will be apt for this. You can contact me too on my contact on practo