question: my son is 3 aND he does have allergies...but hasnt been taking his zyrtec for awhile and he seems to be getting colds alot..everytime i turn around they have colds cough runny nose but no fevers i do have 1 yr twin girls...so i was wondering if i should worry about him getting reaccuring colds.and also hes been complaining of leg pain every once in awhile its mainly at night or in the late evening its never swelled or anything and he walks on it but i worry about childhood cancer ever since i heard about my aunts husbands grandson being the same age as my son and having it.