3-rx.comCustomer Support
HomeAbout UsFAQContactHelp
News Center
Health Centers
Medical Encyclopedia
Drugs & Medications
Diseases & Conditions
Medical Symptoms
Med. Tests & Exams
Surgery & Procedures
Injuries & Wounds
Diet & Nutrition
Special Topics

\"$alt_text\"');"); } else { echo"\"$alt_text\""; } ?>

You are here : 3-RX.com > Medical Encyclopedia > Medical Symptoms > Hives
      Category : Health Centers > Allergies


Alternate Names : Urticaria

Overview, Causes, & Risk Factors | Symptoms & Signs | Diagnosis & Tests | Prevention & Expectations | Treatment & Monitoring

Hives are red, itchy welts on the skin that come and go over the course of minutes or hours. All types of hives can cause itching. They usually form on the skin but sometimes hives form in the soft tissue of the mouth, eyes and throat.

What is going on in the body?

Hives are the result of an allergic reaction in the skin. They are caused by the release of histamine. Histamine is released when a person's immune system tries to fight a foreign substance. The release of histamine causes inflammation in the skin.

What are the causes and risks of the condition?

There are several known factors that cause histamines to be released, and hives to form. These include:

  • allergy to medications or substances in the environment
  • acute or chronic infections
  • foods
  • underlying systemic disease such as asthma, a condition that causes inflammation and obstruction of the airways in the lungs
  • blood products given intravenously, or into the vein
  • scratching
  • heat or cold
  • exposure to sunlight
  • Anaphylaxis is a medical emergency that can cause difficulty breathing and lead to death. It is important to call 911 immediately if anaphylaxis is suspected.


    Next section


    Hives: Symptoms & Signs

    Author: Lynn West, MD
    Reviewer: Ernest J. Dole, PharmD
    Date Reviewed: 07/27/01

    \"$alt_text\"');"); } else { echo"\"$alt_text\""; } ?>

    Home | About Us | FAQ | Contact | Advertising Policy | Privacy Policy | Bookmark Site