These are caused by normal response of immune system reacting to harmless substance in the environment.
The substance can be pollen, dust , mold , animal fur , certain food , insects ect. Which are referred to as allergens.
Common symptoms of an allergic reaction can cause
Sometimes allergy can be life threatening as well . anaphylactic shock is a an allergic reaction where your blood pressure suddenly drops and the airway narrows down leading to possibility is blocking of normal breathing.
This kind of reaction requires immediate treatment or it can be life threatening and fatal.
You can start watching symptoms in 5-30 mins of coming into contact with the allergen.
The best way to take precaution in this case scenario is to avoid allergen and make sure to be prepared . carry an auto injectable epinephrine (often referred as epi-pen) .>
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