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.
Allergies, exercise, and detergents are common causes of hives in adults. In addition, hives are idiopathic, meaning that the cause of some cases is unknown.Food and medication allergies are very common and likely the culprit if the adult recently tried a new medication or food.n allergic reaction to detergent may cause hives in adults. Allergies to nuts may cause hives in adults. Certain medications may cause hives in adults. Allergies to shellfish, like oysters, can cause hives.