Angoedema Attacks

Hello
Does anyone have experience with angoedema attacks? It has started occurring about once a month with my father. His tongue starts swelling up and if not taken care of then he starts suffocating. Now he takes Bendryl and Nexoprene (Allegra) and that stabilizes the swelling, and in the hospital they prescribe  Benedryl,
Pepcid (generic name is Diphenhist diphenhydramine) , Famotidine  and Prednisone and keep him uder observation for 4 hours till the swelling had subsided. They have run many tests but have no idea what might be causing it.
Any thoughts would be really appreciated
Thank you

[Dr Santos]

Hi,
How is your father? Angioedema may be caused by an allergic reaction wherein chemicals such as  histamine are released into the bloodstream.  Some triggers include animal dander; exposure to water, sunlight, cold or heat; foods such as shellfish, fish, nuts, eggs, milk; insect bites; medications; pollen;and even after infections or with other illnesses like autoimmune disorders such as lupus, and leukemia and lymphoma.Unfortunately, in many cases, the cause is never found. It is important that he continue his medications and to have a journal that may help identify the possible triggers. Take care and do keep us posted.

[Dr Santos]

Hi,
How is your father? Angioedema may be caused by an allergic reaction wherein chemicals such as  histamine are released into the bloodstream.  Some triggers include animal dander; exposure to water, sunlight, cold or heat; foods such as shellfish, fish, nuts, eggs, milk; insect bites; medications; pollen;and even after infections or with other illnesses like autoimmune disorders such as lupus, and leukemia and lymphoma.Unfortunately, in many cases, the cause is never found. It is important that he continue his medications and to have a journal that may help identify the possible triggers. Take care and do keep us posted.