[DOC] [TLE] Hay Fever (Rhinitis) | Symptoms & Treatment | ACAAI Public Website [PAR] Learn more about the symptoms, causes and treatments for hay fever. ... In the 
spring, the most common triggers are grasses and pollen. When a sensitive... [DOC] [TLE] Allergies and Hay Fever | American Academy of Otolaryngology ... [PAR] Histamine produces common allergy symptoms such as itchy and watery eyes. ... 
Many common substances can be allergens. ... Early springtime allergic rhinitis is 
most often caused by pollens of trees such as elm, maple, birch, poplar, ... One of 
the major causes of allergic rhinitis in the United States is ragweed pollen. [DOC] [TLE] Hay Fever & Seasonal Allergies: Symptoms, Causes & Treatment [PAR] Feb 18, 2015 ... ... reaction to the environment caused when plants release pollen into the air, ... 
About 8 percent of adults in the United States have allergic rhinitis, Josephson 
said. ... The most common allergen is pollen, a powder released by trees, ... 
different substances to see if any cause an allergic reaction, such as a... [DOC] [TLE] Hay Fever: Symptoms, Diagnosis and Treatments - Medical News ... [PAR] Jun 19, 2015 ... Hay fever is caused by an allergic response to airborne substances, such as 
pollen - unlike ... Roughly 7.8% of people 18 and over in the US suffer from hay 
fever. ... Weed pollen - these are more common during autumn (fall). [DOC] [TLE] Ragweed Allergy | Asthma and Allergy Foundation of America New ... [PAR] Ragweed plants are most common in the east and midwest of the United States. 
... Subsequent exposure to the substance(s) can trigger an allergic reaction. ... (
allergens) circulating in the air, they develop the common symptoms of hay fever. [DOC] [TLE] Rhinitis - Asthma and Allergy Foundation of America [PAR] Substances in the mucus may irritate the back of the throat and cause coughing. 
Postnasal drip ... Infectious rhinitis is possibly the most common type of rhinitis. [DOC] [TLE] Allergies and Hay Fever - Affiliated Ear, Nose and Throat Physicians [PAR] Histamine produces common allergy symptoms such as itchy, watery eyes, nasal 
and sinus congestion, ... Many common substances can be allergens. ... One of 
the most significant causes of allergic rhinitis in the United States is ragweed. [DOC] [TLE] Ragweed Pollen and Fall Allergies - WebMD [PAR] Most cases of hay fever are caused by allergies to ragweed. ... There are 17 
different species of ragweed in the U.S. These plants are most common in the 
rural... [DOC] [TLE] Ragweed Allergies Symptoms and Treatment - Healthline [PAR] Jan 11, 2016 ... There are at least 17 species of ragweed that grow in North America. ... However, 
the most common ragweed allergy symptoms include: ... who are allergic to other 
substances are more likely to be allergic to ragweed pollen. [DOC] [TLE] "Hay fever" (allergic rhinitis) - Wikipedia [PAR] Skin testing is the most common method of allergy testing. This may include a 
patch test to determine if a particular substance is causing the rhinitis, or an... [DOC] [TLE] Seasonal Allergies Symptoms, Causes and Treatment - Healthline [PAR] Jun 21, 2016 ... Common triggers of hay fever vary from one season to another. ... It responds to 
that substance, or allergen, by releasing histamines and ... the Asthma and 
Allergy Foundation of America, grasses are the most common ... Their pollen is a 
very common allergen, and the symptoms of ragweed allergy can be... [DOC] [TLE] Allergic Rhinitis (Hay Fever) | Paris Asthma and Allergy Centers [PAR] Known to most people as hay fever, allergic rhinitis is a very common ... When a 
sensitive person inhales an allergen (allergy-causing substance) like ragweed 
pollen, ... 75 percent of allergic rhinitis sufferers, blankets most of the United 
States. [DOC] [TLE] Allergies & Hayfever - Eastern Virginia Ear, Nose, & Throat Specialists [PAR] Hay fever, asthma, and eczema are the most common symptoms of an allergic ... 
The most significant cause of hay fever in the United States is ragweed. [DOC] [TLE] hay fever facts, information, pictures | Encyclopedia.com articles ... [PAR] Hay fever is one of the most common chronic

Question: The most common cause of hay fever in the U.S. is this substance from ragweed
Answer: Pollen