For about 6 months now,my son constantly coughs, like he is clearing his throat, does not sound chesty at all and is well in himself other than this. Sometimes it can go on for ages!! I finally went to doc who said his chest is clear, but said it could be asthma !?! I'm not entirely sure about this, although don't know much about it. He was given a blue pump and was told to do this twice a day and monitor levels on another pump and go back in 3 weeks. It's now been 4 days and I see no improvement at all. Any comments and suggestions??thank u