Allergy symptoms occur when a person with a genetic predisposition develops allergies when in contact with a specific allergen, such as weed or house dust.
After some time, an allergic person produces more IgE antibodies, and these IgE antibodies come into contact with specific allergens that they are attracted to, mast cells release chemical mediators such as histamine that cause allergy symptoms.
When this action takes place in the nose, it is called allergic inflammation of the nasal mucosa, and when it takes place in the eye, it is called conjunctivitis, and if it is in the respiratory tract, it is called allergic asthma.
Pollens in the air cause allergic inflammation of the nasal mucosa