When allergens come in contact with our body, the immune system goes into overdrive to fight with them. Allergens trigger our immune cells to release histamine. Furthermore, due to this immune response, allergies can cause an itchy throat. The histamine response causes irritation and inflammation. When you breathe in air, the particle can also cause irritation and itchiness in your throat. For same-day seasonal allergy relief, visit AFC Urgent Care Union City today! How Seasonal ...