 [ Symptoms ] can an asthma attack be triggered by traveling from high altitude to a low altitude destination  my 6 year old son traveled with his father from colorado to north carolina for a vacation he has a history of mild asthma with only one previous attack a year ago accompanied by a cold he did not have any symptoms of a cold when he left and no trouble breathing 45 minutes after arriving in north carolina he had a severe asthma attack and was treated by airport paramedics with two albuteral nebulizer treatments could this be caused by going from one climate to another [ Disease ] hi your due date is worked out from the first day of your last full period that is the way it works unless that was not a full blown 5 to 7 day period if so you then work from the period before good luck