I have Hughes, Sjorgrens, Fybromyalgia plus a few other things thrown in. I have always avoided fresh apple and tomatoes as they cause almost instance mouth ulcers - cooked they are fine.
A couple of years ago I started having problems with other fruit - it started with cherries then went on to pineapple, apricots, nectarines, figs and on and on! I blame it on turning 50!
I am told it is called oral allergy syndrome and is caused by my immune system confusing some fruits, particularly their skins, with certain tree pollens that I am allergic to. Symptoms horrendous within minutes: burning in the mouth, swollen lips, swollen tongue with bleeding, ear pain, sore throat and then as it gets down to the stomach, tummy ache, pains in the joints etc. Answer avoid raw fruit, eat only cooked fruit - simples! Have done that for an entire year and have not had a problem. Last night I tried some fig jam I had made with last years crop (made with just fresh organic figs off the tree with some water nothing else added) - would you believe I tasted the end of a teaspoon. Wham! Off I was again with all the symptoms and I am typing this with a sore mouth and arthritic fingers.
So I am interested in other people's experiences with this wonderful turn of events!