A risk factor for fatal anaphylaxis is a sudden change to an upright posture
On allergy action plans, it states that if a person is having anaphylaxis, do not allow them to stand or walk. Why? Fatalities have been recorded when a person having anaphylaxis is suddenly allowed to stand. Richard Pumphrey published in 2003 (http://www.jacionline.org/article/S0091-6749(03)90000-5/fulltext) cases of individuals with anaphylactic shock dying within seconds of an upright posture.[…]