Allergies=misery. Nasal / ocular allergies typically associated with sneezing, itching, redness and watering. Flu / infection associated with cough, redness, drainage, pain maybe itching, sneezing, headache, and a variety of systemic symptoms such as fever, malaise, GI disturbance, etc. In mild cases it may be difficult to tell apart. And people with allergies get the flu and vice versa.