I'm 27 male. Since childhood I experience asthma, shortness of breath only in the month of april every year. I have consulted many doctors they refer chest pa view cbc and spirometry but theres nothing found in it. Is this due to pollen allergy or anything else? It doesn't happen all year happens only in april for 15 days and I take monticope and foracort inhaler for 15 days and it vanishes on it's own than comes back next year in april. What it could be just an overview what makes this happen at the same month every year? Please suggest.