Urticaria

Urticaria (from the Latin urtica, nettle, commonly referred to as hives, is a kind of skin rash notable for pale red, raised, itchy bumps. Hives are frequently caused by allergic reactions; however, there are many nonallergic causes. Most cases of hives lasting less than six weeks (acute urticaria) are the result of an allergic trigger. Chronic urticaria (hives lasting longer than six weeks) is rarely due to an allergy.

The majority of chronic hives cases have an unknown (idiopathic) cause. In perhaps as many as 30 to 40% of patients with chronic idiopathic urticaria, it is caused by an autoimmune reaction. Acute viral infection is another common cause of acute urticaria (viral exanthem). Less common causes of hives include friction, pressure, temperature extremes, exercise, and sunlight.

Read more about Urticaria:  Appearance of Symptoms, Pathophysiology, Management

Other articles related to "urticaria":

Aquagenic Urticaria
... Aquagenic urticaria, also known as water urticaria and aquagenous urticaria, is a rarely diagnosed form of physical urticaria ... it is not a true histamine-releasing allergic reaction like other forms of urticaria ...
Chronic Urticaria
... Urticaria (from the Latin urtica, nettle,) commonly referred to as hives, is a kind of skin rash notable for pale red, raised, itchy bumps ... Most cases of hives lasting less than six weeks (acute urticaria) are the result of an allergic trigger ... Chronic urticaria (hives lasting longer than six weeks) is rarely due to an allergy ...
Urticaria - Management - Other
... For acute urticaria, some topical creams, such as hydrocortisone, fluocinonide, or desonide, can also be prescribed to relieve itching ... To boost relief for severe anaphylactic urticaria, a dermatologist will also administer steroid shots intramuscularly ... (formerly CUV1647), for the treatment of solar urticaria, a type of urticaria that develops in response to exposure to specific wavelengths of light ...
Chronic Urticaria - Management - Other
... For acute urticaria, some topical creams, such as hydrocortisone, fluocinonide, or desonide, can also be prescribed to relieve itching ... To boost relief for severe anaphylactic urticaria, a dermatologist will also administer steroid shots intramuscularly ... CUV1647), for the treatment of solar urticaria, a type of urticaria that develops in response to exposure to specific wavelengths of light ...
Chronic Urticaria - Classification - Related Conditions - Angioedema
... Angioedema is similar to urticaria, but in angioedema, the swelling occurs in a lower layer of the dermis than in urticaria, as well as in the subcutis ... Urticaria and angioedema sometimes occur together in response to an allergen, and is a concern in severe cases, as angioedema of the throat can be fatal ...