[Anaphylaxis and urticaria caused by exercise. Review of the literature and report of 2 cases].

Urticaria is a common pathology, yet, urticaria induced by physical agents represent 17% of urticaria cases, they are more frequent in adolescents and young adults. Exercise may induce anaphylaxis, urticaria, asthma and rhinitis. This first two pathologies are not so usual. The incidence of cholinergic urticaria (CU) is five to seven percent. this incidence of anaphylaxis induces by exercise has not been described. It is very difficult to clinically distinguish CU and EIA, establish criteria are described in the paper. There are two clinical forms of CU; local and systemic. The ideal diagnostic methods was the ID methacholine test. Antihistaminics are the treatment of choice, together with tolerance induction by progressive exercise. Two typical cases of CU are presented as they occurred at the Allergy and Clinical Immunology Service of Hospital Infantil de Mexico, Federico Gomez.