what symptoms do allergies cause
But in the case of hay fever, symptoms usually appear when a person encounters an allergen, such as pollen or mold. Symptoms include itchy eyes, itchy nose, itchy throat, itchy ears, sneezing, irritability, nasal congestion and hoarseness. People may also experience cough, postnasal drip, sinus pressure or headaches, decreased sense of smell, snoring, sleep apnea, fatigue and asthma, Josephson said.
For dogs and cats, the most common sign of food allergy is itching and scratching. Other signs of food allergies are head and neck itching, miliary dermatitis, eosinophilic granulomas, swollen lymph nodes, hives, and conjunctivitis.