Signs and Symptoms. There are various kinds of allergies, which are caused by different allergens and therefore, the symptoms of different allergies are different. However, some of the common symptoms are: Sneezing. Sinus or migraine pain. Runny nose. Coughing. Hives. Puffiness or swelling. Itching in eyes, ears, throat, lips, and palate. Fever. Vomiting. Diarrhoea.