I too seem to have a lot of allergies which include strawberries , eggs , Augmentin (An antibiotic. I only discovered this when I was given it to combat a fever I developed in labour with my eldest daugher and on taking it , my face swelled and my jaw locked. My hubby thought that it was a bonus that I couldn't really talk for a while lol !) , oranges , anything containing citric acid etc. I am also mildly asthmatic and suffer from hayfever and I had heard too that these are linked , just as Lore said.
My health visitor told me that they have now discovered that improper weaning ie too early or being exposed to too many different foods too quickly can lead to allergies in later life. That is why they advise weaning to start a bit later now and to only introduce a new food every couple of days to see if there is a reaction. Also , if you suffer from a food allergy , it is advised that you wait longer to give your kids common problem allergy inducing foods such as oranges and eggs. My mum swears that she weaned me correctly though ! My parents don't have these food allergies (although my mum has the nickel allergy) but my brother and sister both are slightly asthmatic and my brother has hayfever - as does my mum. I don't know how much of it is genetic and how much is due to external stimulants in the environment. All I know is that my sister hates oranges and eggs and won't eat them and I love them but can't eat them. Sods law eh ?!!