# description
Identification of the underlying physiological mechanism for a Reaction Risk.

# concept[].definition
A propensity for hypersensitive reaction(s) to a substance.  These reactions are most typically type I hypersensitivity, plus other "allergy-like" reactions, including pseudoallergy.

# concept[].definition
A propensity for adverse reactions to a substance that is not judged to be allergic or "allergy-like".  These reactions are typically (but not necessarily) non-immune.  They are to some degree idiosyncratic and/or patient-specific (i.e. are not a reaction that is expected to occur with most or all patients given similar circumstances).