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Allergies result in many different symptoms such as sneezing, runny nose, itchy eyes, coughing, rashes, swelling of the face, stomach pain, vomiting, dry skin, anaphylaxis, etc.

An allergen can cause different symptoms for different people who are allergic to it... and different allergens can cause completely different symptoms for the same person. What characteristics of an allergen and/or the person determine what symptoms will arise?

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closed as too broad by anongoodnurse, David, AliceD Jun 6 '18 at 21:14

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.