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.
Other triggers that may cause hives include: 1  Sunlight. 2  Heat. 3  Cold. 4  Constricting clothing. 5  Anxiety or stress. 6  Exercise. 7  Insect stings/bites. 8  Recent (viral) infections. 9  Contact with chemicals. 10  Scratching your skin.