What are the usual symptoms of allergies in people?

Depends: Upper airway: stuffy nose, itchy nose, sneezing, sniffing, itchy roof of mouth or throat, itchy, watery eyes. Lungs: coughing, wheezing, chest pain, shortness of breath skin: itchy rash. (itchy without rash, rash not itchy is not allergy) gi: nausea, vomiting, diarrhea after eating certain foods. Gi symptoms are not specific to allergy. History is very important.