Allergic Rhinitis

(Hay Fever; Seasonal Allergies)

Definition

Allergic rhinitis is irritation and inflammation in the nasal passages after exposure to allergens. Allergens are substances that cause an abnormal response of the immune system. The response can includes swelling of the nasal passage, runny or itchy nose, watery eyes, congestion and congestion pain, and sneezing. It may be:
  • Seasonal (intermittent) allergic rhinitis (sometimes called hay fever or rose fever)—This occurs during times of the year when allergens are in the air, like spring, summer, and fall. The most common allergens are tree, grass, or weed pollens.
  • Perennial (persistent) allergic rhinitis—This condition is caused by allergens that may be present year round. These may include chemicals, dust, dust mites, cockroaches, animal dander, or mold spores. Symptoms may be present any time of year.

Causes

An allergic reaction occurs when your body's immune system overreacts to an allergen. When you breathe in an allergen, cells in your nasal passages release a chemical called histamine. Histamine causes your nose to feel itchy and creates swelling and mucus production in the nasal passages.
Site of Histamine Production
Nasal passage
This area has swelling and increased mucus production after contact with an allergen.
Copyright © Nucleus Medical Media, Inc.

Risk Factors

Factors that increase your chance of having allergic rhinitis include:

Symptoms

Exposure to the allergen can cause:
  • Sneezing
  • Itching in the nose, eyes, throat, and ears
  • Red, watery eyes
  • Runny nose, nasal congestion
  • Congestion with sinus pressure
  • Postnasal drip and cough
  • Headache
  • Dark circles under your eyes

leave comments
0
Did you like this? Share with your family and friends.
Related Topics:
Current Research From Top Journals



July 2015

A randomized trial found that fecal microbiota transplantation had a higher rate of remission in patients with active ulcerative colitis than those who recieved placebo. Fecal transplantation is believed to help the intestine develop a healthy balance of bacteria in the gut which can help the intestine recover and function more effectively.

dot separator
previous editions


June 2015


May 2015

Chewing Gum After Surgery May Improve Digestive Tract Recovery
April 2015

dashed separator

Advertisement

Our Free Newsletter
click here to see all of our uplifting newsletters »

 

Advertisement

Advertisement

DiggDeliciousNewsvineRedditStumbleTechnoratiFacebook