Your son's chest problem is unlikely to be due to asthma. His coughing and chest complaint seems to be due to infection of his chest.It is rather unusual for a child of 4 years to still be getting repeated chest infections like this. Flixotide is an excellent treatment for asthma and it has not made any difference. Also the tests that he has had are all negative.It is not true that asthma can only be diagnosed once a child is 5 years old.Your son should have tests done to see if his immunity against infection is normal. These tests are for immunoglobulins known as IgA, IgG and IgG subclasses.It would be best to take your son back to a paediatrician or to get another opinion from a paediatric pulmonologist.
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