My six year old son has started to become paranoid about catching any kind of ailment to the extent that he is making himself upset and crying at the thought of catching something. I have tried reassurence and facts about the human body but his worries are not abating.His teacher pulled me aside today to say this behaviour is now occuring in class. I have booked an appointment to see the GP but is this an over reaction, could this be a phase. Children are exposed to so much more information now than we were, dont want him developing anxieties so young when should be full of fun.