My ds age 4 has got oral thrush..again. What could be causing this? I seem to never be away from the doctors surgery to the point where i now feel embarassed when i go. I have taken him for hayfever, persistent coughs, thrush, sore willy and viruses all in the last six months. He does have a possilble immune deficiency tho. I was planning to go to work or college in september when he starts school but i'm sure i'd have been sacked by now if i'd have worked this year! Sorry to go on, feeling v fed up.