DermNet - Urticaria -
 Information on different types of hives, including cholinergic urticaria and dermographism.
http://www.dermnet.org.nz/dna.urticaria/urt.html

Discovery Health - Hives -
 Description of hives, symptoms, prevention, treatment, when to call the doctor, and prognosis.
http://health.discovery.com/diseasesandcond/encyclopedia/113.html

eMedicine Health - Hives and Angioedema -
Consumer health resource center providing information on the causes, symptoms, and treatment.
http://www.emedicinehealth.com/

Hives - DrGreene.com -
 Question and answer format explaining possible causes of hives, as well as treatment and prevention.
http://www.drgreene.org

Hives - DrGreene.com -
Read an article explaining a common rash and its many causes.
http://www.drgreene.com/

International Chronic Urticaria Society -
 Extensive clinical and anecdotal information about chronic hives from members of a mailing list support group.
http://www.urticaria.thunderworksinc.com

Stop And Smell The Roses -
 Living with Urticaria Pigmentosa. Find articles and information about a book.
http://www.angelfire.com/weird2/ripleystvguest/

Understanding Urticaria -
A flash presentation showing the causes and treatment of urticaria. It also illustrates how steroids suppress urticaria without helping.
http://www.urticaria.com/flaUrt/urticaria.html