A caffeine allergy is an adverse reaction by the body's immune system to caffeine or caffeine-containing products The type and severity of symptoms can vary amongst patients.
A person becomes allergic to caffeine when his caffeine intake increases and so does his tolerance to caffeine. As a result, excessive caffeine in the body can bring about allergic reactions to caffeine. When this happens even a small amount of caffeine is rapidly absorbed by the nerves and organs in the body and trigger the disorder.
Caffeine allergy or intolerance to caffeine affects many people worldwide. However, many are not aware of this condition and may blame the symptoms of caffeine allergy to other factors.
Symptoms of Coffee Allergies
"....Symptoms of anaphylactic shock include hyperventilation, chest pains, heart palpitations, a tightness or "closing up" of the throat and problems breathing. One of the byproducts of caffeine (called theophylline) acts to keep the bronchial tubes open. Consequently, allergic individuals having an anaphylactic response are unlikely to suffer a respiratory collapse. Nonetheless, anaphylactic shock can be deadly, so if you are experiencing any of these symptoms, call 911 for emergency medical help immediately...."