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.
Hives in adults can also be brought on by poor skin care. This can come in the form of dry or chapped skin, extreme sunlight, body tanning, extreme cold condition plus several others. The care of your body and the health of your skin play an enormous roll in what causes hives in adults.hat Causes Hives in Adults-The Immune System: What we do know is that hives in adults has a great deal to do with the immune system.