Angioedema is an allergic reaction where swelling occurs under the skin. Symptoms may include swelling around the eyes and lips. In severe cases, swelling in the tongue or throat can cause breathing problems, which can be life-threatening. There are many types of angioedema, and treatments include antihistamines, steroids, and epinephrine. Follow the links below to find WebMD's comprehensive coverage about how angioedema is caused as well as the types, symptoms, treatments, and much more.