constituting or forming a large number; numerous: many people. noting each one of a large number (usually followed by a or an): For many a day it rained. a large or considerable number of persons or things: A good many of the beggars were blind. the many, the greater part of humankind. many persons or things: Many of the beggars were blind.
Hives and angioedema can be caused by: 1  Foods. Many foods can trigger reactions in people with sensitivities. 2  Medications. Almost any medication may cause hives or angioedema. 3  Common allergens. Other substances that can cause hives and angioedema include pollen, animal dander, latex and insect stings.  Environmental factors.
1 Localized hives appear on one part of the body and are usually caused by direct skin contact with plants, pollen, food, or pet saliva and fur. 2  Widespread hives appear all over the body. 3  They may be a reaction to a viral infection or an allergic reaction to a food, drug, or insect bite.