 [ Symptoms ] my son was suspected of cf last year but a sweat test was normal we are not sure though as we have recently heard you can still carry the gene and get it later as a kid and that he should have gene testing he is small for age and we have had him to an ent and immunologist for this nosethroat clearing that is sometimes all day long he did have a few sinus infections and tried many many meds to dry him up and shrink nasal passages but they did nothing just had him there yesterday and once again lot is of thick clear junk in his nose per the dr do you think we should bother getting tested [ Disease ] magnesium dificiency can be fixed in 5 days 6 month magnesium over dose can cause calcium dificiency which can cause similar symptoms so you should look for the cause of magnesium dificiency like for example to much alcohol crohn is disease or liver problems good luck