Result of atherosclerotic plaque blocking one or more of the blood vessels that supply the heart. Can cause chest pain/angina pectoris occurring due to stress of exercise. If blockage completely impedes blood flow to the heart, a heart attack can occur.
It can be caused by insect stings, food, or medicines. It's caused by the release of histamine into your bloodstream and tissues. Histamine is an immune system chemical. Tongue or throat swelling can happen along with an allergic rash (hives), wheezing, diarrhea, and shock (low blood pressure).
In addition to allergies, non-allergic causes of a swollen tongue can include: 1  An infection in or on the tongue. 2  A tumor or mass. 3  An insect bite or sting on the tongue that causes swelling, even though it might not trigger an allergic reaction.