Allergies from hot spicy serrano peppers what are the symptoms?

you tell us: Allergies can include several different symptoms, ranging from a mild GI upset, nauseousness, rash, headache, flushing to name a few, ... To a serious anaphylactic reaction requiring emergent treatment.

Food intolerance: It is likely that you have intolerance to spicy pepper than allergy to it. However if it is true food allergy, you can develop generalized hives, throat swelling, difficulty breathing, nausea and vomitting and if untreated, even death if it develops into anaphylactic shock.