All are allergic reactions the same?
The cellular and biochemical processes are the same for all allergic reactions but they vary in severity. When the body is exposed to an allergen (antigen) the leukocytes form antibodies specific to the antigen, this is called sensitization. These antibodies seek to destroy the offending allergen. The antibodies produced in all allergic reactions are called IgE, immunoglobulin E. IgE causes the production of cell "mediators", the chief mediator in allergic reactions is histamine. In mild allergic reactions, say for example to dust or pet dander, when histamine is liberated, it causes symptoms like sinus congestion, watery itchy eyes, upper airway irritation that leads to coughing, etc.
Anaphylaxis is a more severe type of allergic reaction. The same IgE response and histamine production occur but symptoms are amplified. These symptoms may include tracheal edema and laryngospasm. These severe reactions can surface literally within seconds after coming into contact the the offending allergen.
some people may get a rash
some peoples throat closes up
some people get hives
No, they are not.
An allergic reaction is how our body reacts to a foreign substance; not everyone will have the same reaction.
A reaction can be a simple as a skin rash or may be life-threatening.