what is signs of an allergic reaction
The look and feel of an allergic reaction depends on the body part involved and the severity of the reaction. Some reactions may be localized and limited, while others could involve multiple body systems. Reactions to the same allergen vary among individuals. 1  Anaphylaxis is the term for any combination of allergic symptoms that is rapid, or sudden, and potentially life-threatening. 2  One sign of anaphylaxis is shock. 3  Breathing may be difficult or noisy, or the person may be unable to breathe. 4  Shock is caused by sudden dilation of the blood vessels. 5  Sy