A range of possibilities!
- Isolated type 1 allergy
- Multiple type 1 fruit allergies – usually to similar fruit but also some common co-sensitivities eg banana/melon/avocado/chestnut/latex group
- Oral allergy syndrome (pollen food syndrome) – esp peach and related stoned fruit, cross reactivity with pollen (so hay fever), sometimes nuts too. Various patterns depending on allergen family.
- Salicylate intolerance (so not allergy) esp cherries, raw tomato, pineapple juice
- Histamine-releasing foods (wine famously, otherwise strawberry, papaya, kiwi and pineapple)
- Naturally occurring serotonin (tomato again, banana) and tryptamine (tomato again, plum) cause allergy like symptoms [EAACI 2023]
Berry allergy
Some evidence of cross reactivity between raspberry and strawberry but there’s not much evidence to suggest cross reactivity with other berries. There’s a theoretical link with blackberry, and other things in the same family (Rosaceae – massive group of fruit including apples, peach, pear, apricot, cherry).
Only one report of blueberry allergy ever!
Found one paper that said tree nuts, celery and parsley might also be related to berries, but again I think theoretical.
Pineapple allergy
Can be part of pollen food syndrome (due to profilin allergy) so mostly oral symptoms, hay fever, cross reactivity with other fruits as well as nuts.
Might be salicylates as above rather than allergy.
But can also be allergy to bromelain (similar to papain), with potential for anaphylaxis.
Sometimes associated with latex-fruit syndrome and ficus-fruit syndrome (all tropical, not latex – kiwi, papaya, avocado, banana).
Melon allergy
Can be part of banana/latex group, but also cucurbitae – watermelon, cucumber, courgette, pumpkin.