OAS and fruit allergies can trigger symptoms that range from uncomfortable to severe and even life-threatening. Common signs and symptoms include: itching or tingling in the mouth swelling of tongue, lips, and throat sneezing and nasal congestion lightheadedness nausea abdominal pain diarrhea In some cases, a life-threatening reaction called anaphylaxis may occur. Seek emergency medical attention if you experience any of the following: throat swelling airway constriction rapid pulse dizziness loss of consciousness low blood pressure shock