Allergies kick in when your immune system overreacts to normally harmless substances called allergens. Your body releases a chemical called histamine, and you start to experience a variety of symptoms.
1. Itchy, watery eyes
Many allergens are airborne and come into direct contact with your eyes. That's why over 80% of people with allergies experience itchy, watery, teary eyes.
2. Runny nose
When allergens enter your nose, the membrane swells and presses a fluid out of small blood vessels in your nasal passages – typically a thin, clear liquid.
Your body's reaction to histamine includes itchiness and swelling inside your nose and throat. As a result, your brain tells your chest to contract and you start sneezing.
4. Itchy nose or throat
Itchy nasal passages are also a reaction to a lot of histamine in your system.
5. Sinus congestion
If your allergies include upper respiratory symptoms – sneezing, itchy and runny nose – your sinuses may become swollen and blocked.
ZYRTEC® gives you powerful relief from these allergy symptoms. If you have a blocked nose, ZYRTEC®-D will also help to alleviate nasal and sinus congestion.