immune disorders
Physical Allergy
Introduction
A physical allergy is an allergic reaction triggered by a physical stimulus. (See also Overview of Allergic Reactions .) A physical allergy differs from other allergic reactions because the trigger is a physical stimulus. Physical stimuli include the following: Cold Sunlight Heat or other stimuli that cause sweating (such as emotional stress or exercise) Vibration Minor injuries (such as those due to scratching) Physical pressure For some people, symptoms occur only in response to a physical stimulus. For some people who have other allergies, a physical stimulus makes symptoms worse. 