It is quite common for children with asthma to never have an actual attack. most children are diagnosed with having asthma if there is a family history of this condition, a night cough and exercise-induced cough or wheeze. Your son does fit the diagnostic profile for asthma.The Xray you mention is also suggestive of asthma. He is now old enough to blow on a simple peak flow meter so he can have this lung test done now. In fact he must have this test done at every visit to the paediatrician.
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