I've had a long-term salicylate intolerance and avoid salicylates as much as possible in my diet. Last year I was diagnosed with an under-active thyroid and found once I was started on the medication that a lot of my allergic rhinitis disappeared. I was still having reactions to salicylates but not nearly as bad. Thyroid problems are apparently very common and as mine was under-active my metabolism wasn't processing things as it should making my symptoms worse – Caroline, UK

(Note that one cause of underactive thyroid could be iodine deficiency. This has become more common as iodine intake has dropped in industrialised countries over the last two decades due to less (iodised) salt being added to meals. Too much iodine can be as bad as not enough. Failsafe sources of iodine include seafood (2-3 times a week), dairy foods and eggs but not seaweed such as kelp or nori. Dietitians now recommend iodised salt for the RPAH Elimination Diet. Recommended Multivitamins also contain iodine. If in doubt, consult your dietitian.)

More information http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Iodine_explained). http://www.foodstandards.gov.au/consumer/safety/recalls/bonsoy/pages/default.aspx