Though there are many urticaria causes by non-allergic reasons, the most common ones occur in response to allergic triggers.

Allergic urticaria or urtcaria allergy is a skin severe condition, characterized by the presence of welts that itch intensely. It is caused by an allergic reaction, an infection, or a nervous condition.

Histamine and other pro-inflammatory substances are released from  mast cells, which are released in the skin and tissues in response to the binding of allergen-bound antibodies to high affinity cell surface receptors. Do you have more interest in this topic? Click here for allergic urticaria and urticaria allergy details.