When taking aspirin 81mg my stomach has a dull burning feeling does this mean i am allergic ?

Maybe not: A person allergic to aspirin may get some symptoms within an hour of taking aspirin, such as: hives. itchy skin, runny nose, reddened eyes, lip swelling, tongue swelling, face swelling, coughing, wheezing, or shortness of breath. Aspirin can irritate the stomach, which means stomach irritation or burning symptoms may be an intolerance of the aspirin rather than an allergic reaction to aspirin.