allergy

As nouns the difference between allergy and sick

is that allergy is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma while sick is sick people in general as a group.

As an adjective sick is

in poor health.

As a verb sick is

to vomit or sick can be (rare).

In pathology|immunology|lang=en terms the difference between allergy and autoimmune

is that allergy is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma while autoimmune is (pathology|immunology) of or pertaining to autoimmunity.

As a noun allergy

is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma.

As an adjective autoimmune is

(pathology|immunology) of or pertaining to autoimmunity.

Atopic is a synonym of allergy.

As a noun allergy

is a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma.

As an adjective atopic is

of a hereditary predisposition towards developing hay fever and other allergic reactions.

As nouns the difference between allergy and allergens

is that allergy is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma while allergens is .

As a noun allergy

is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma.

As a verb sensitize is

to make increasingly aware of, in a concerned or sensitive way.

As a noun allergy

is (pathology|immunology) a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma.

As a verb sensitizing is

.

As an adjective sensitizing is

that sensitizes.

As nouns the difference between allergy and aversion

is that allergy is a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma while aversion is opposition or repugnance of mind; fixed dislike.

As nouns the difference between allergy and cold

is that allergy is a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma while cold is a condition of low temperature.

As an adjective cold is

having a low temperature.

As an adverb cold is

while at low temperature.

As nouns the difference between pseudoallergy and allergy

is that pseudoallergy is a condition that resembles an allergy but is not a true allergy while allergy is a disorder of the immune system causing adverse reactions to substances (allergens) not harmful to most and marked by the body's production of histamines and associated with atopy, anaphylaxis, and asthma.