An allergy is an over-reaction by the immune system to
a particular substance.
Although the term is often used to refer to dust allergies or
airborne allergies (pollen allergies/hay fever),
any possible substance can cause allergic reactions in different people.
Thus there are also animal allergies,
food allergies (e.g. peanut allergies, shellfish allergies),
drug allergies (e.g. penicillin allergy),
insect sting allergies,
and many others.
Allergies causing skin conditions
may result in eczema or dermatitis.
The effect of an allergy ranges from mild
to very severe, and prompt profesional medical advice
Many types of allergy are difficult to diagnose
and thus may be both over-diagnosed and under-diagnosed
at different times.
Allergies: An allergy is a specific immunologic reaction to a normally harmless substance, one that does not bother most people. People who have allergies often are sensitive to more than one substance. Types of allergens that cause allergic reactions include pollens, dust particles, mold spores, food, latex rubber, insect venom, or medicines. 1
Researching symptoms of Allergies: Further information about the symptoms of Allergies is available including a list of symptoms of Allergies, other diseases that might have similar symptoms in differential diagnosis of Allergies, or alternatively return to research other symptoms in the symptom center.
Misdiagnosis and Allergies: Research more detailed information about misdiagnosis of Allergies, failure to diagnose Allergies, underlying causes of Allergies (possibly misdiagnosed), or research misdiagnosis of other diseases
Statistics and Allergies:
Various sources and calculations are available in statistics about Allergies,
prevalence and incidence statistics for Allergies,
and you can also research other medical statistics in our statistics center.
1. excerpt from Something in the Air Airborne Allergens: NIAID
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