Idiopathic Urticaria

Idiopathic urticaria

        In 50 to 80% of cases, we can not find the cause of hives. The doctor has sometimes chance to find a cause for this rash and it is sufficient to eradicate the practice or allergen desensitization to treat the patient. Most often, the survey remains negative and the treatment may not be symptomatic. Psychosomatic origin is suspected. A survey of allergies quasi-policing is needed to decide:

• A drug taken;
• Pollen, feathers, dust;
• A parasite;
• Drag an infection (Candida, genital infection);
• An intolerance to certain foods.

        The rash is a frequent reason for consultation: 15% of individuals are affected at least once in their life. Histamine is the main inflammatory mediator involved in the occurrence of lesions as hives or immunological origin or non immunological. The acute urticaria is most often a single episode and requires no additional biological exploration. It is essential to try to identify the cause by a careful examination and possible testing practice allergists to prevent a recurrence that could be much more severe (anaphylactic shock).

        Drugs and certain foods are the main causes of acute urticaria. In most cases, the mechanism is not immune. Hives is a syndrome with multiple causes, sometimes intertwined, in the chronic forms. The urticarial vasculitis syndrome should seek a systemic disease that may occur secondarily. Angioedema is a deep urticaria .The diagnosis of hereditary angioedema is often delayed. A quarter of non-treated patients achieved dies of laryngeal edema.