Physicians divide the disorder into 4 categories: allergic reaction, response to specific medicaments, idiopathic, and hereditary. Allergy is the most widespread Angioedema in the world. Patients may be sensitive to different things like materials, food, beverages, medical treatment, animal species, etc. These people should be aware of the potential threats such as insects, plants, meals they take, and more. When blood pressure quickly drops down, it is the sign of the severe form known as anaphylaxis.