Swelling of he face, tongue or eyes can be associated with an allergic reaction that is either moderate or severe, as related by the National Institutes of Health. In a severe allergic reaction, anaphylaxis can occur, causing swelling in the throat. This is a life-threatening reaction that requires urgent medical attention.
The swelling, or edema, is one way the body responds to exposure to certain allergens. People can be allergic to different things, such as insect bites, medicines, plants and foods, as noted by eMedicineHealth. Symptoms of a mild allergic reaction can be hives, skin rashes and itchy skin. In people who have severe reactions, these symptoms can occur within a few seconds or minutes after exposure to the particular allergen.