Immunologic

 IgE-mediated urticaria

 Complement-mediated urticaria

 Autoimmune urticaria

 Immune contact urticaria

Physical

 Dermographism

 Cold urticaria

 Solar urticaria

 Cholinergic urticaria

 Pressure angioedema

 Vibratory angioedema

Exercise-induced

Urticaria due to mast cell-releasing agents, pseudoallergens, ACE inhibitors

Idiopathic urticaria

Nonimmune contact urticaria

Urticaria associated with vascular/connective tissue autoimmune disease

Distinct angioedema (± urticaria) syndromes

 Hereditary angioedema

 Angioedema-urticaria-eosinophilia syndrome