Difference between sedating and non sedating antihistamines

What exactly are cold alleriges, and what can be done about them?I was recently diagnosed as having an allergy to the cold, and although the doctor tried to explain it to me, I didn’t fully understand what it is.Most people don’t know that allergies can be transmitted in transfusions, but they can (Nelson Textbook of Pediatrics, WB Saunders, 2000)!For some people, cold urticaria is a lifelong condition; for others, it is temporary — only during and after an infection, such as mycoplasma or mononucleosis.The hardy nose is a remarkable organ designed to condition inhaled air to protect the delicate internal structures.

The hives are produced by a rapid release of histamine brought about by Ig E antibodies and eosinophils (a type of white blood cell often involved in allergic reactions) in response to the cold.Many tiny blood vessels, known as capillaries, bring about this temperature exchange.When a person breathes cold air, the tissues lining the nose swell as the capillaries dilate, bringing warm blood to heat the cool air.An allergy happens when part of the immune system goes awry.In its enthusiasm to protect us, the response by the immune system is sometimes so exuberant that it is worse than whatever precipitated it.