My husband is recovering from chest infection but crackles have been heard in one lung, these were also seen on chest xray before treatment. G.P. not sure if he has asthma but may have allergy. Do any of you have/had crackles on lungs? ?related to asthma, hubby does not wheeze. Worried about this. He is told to go for another chest xray in a few weeks when all antibiotics are out of system.He is fit and peak flow reading much improved.