hay fever

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Related to Hay-fever: allergic rhinitis

hay fever

 
an atopic allergy characterized by sneezing, itching and watery eyes, nasal discharge, and a burning sensation of the palate and throat. It is a localized anaphylactic reaction to an extrinsic allergen, usually pollen or the spores of molds. When the allergen comes in contact with cell-bound immunoglobulin E in the tissues of the conjunctiva, nasal mucosa, and bronchial tree, the tissues release mediators of anaphylaxis and produce the characteristic symptoms of hay fever.

The amount of pollen in the air varies with the season and geographic area. East of the Rocky Mountains, the peak of the regional hay fever season occurs between mid-August and mid-September, when the air is heavy with the pollen of the ragweed plant. An appreciable number of hay fever sufferers are also reactive to the spring pollens from grasses and trees. Mold-bearing plants such as wheat, barley, and corn are prevalent in the agricultural areas of the Midwest, and attacks of hay fever caused by mold spores are common there as these crops ripen.

Hay fever should be recognized as more than a mere nuisance. By causing lack of sleep and loss of appetite, it can lower the body's resistance to disease. It can cause inflammation of the ears, sinuses, throat, and bronchi. Some hay fever sufferers develop asthma.

Hay fever can be relieved, although not cured, by antihistamines and sympathomimetic drugs such as ephedrine and phenylpropanolamine hydrochloride. loratadine and desloratadine are newer antihistamines that do not cause the drowsiness, mental dullness, and sleepiness that were traditionally associated with antihistamines. cromolyn is also an effective therapy, supplied in an inhaler that produces a spray of droplets to settle on the nasal mucosa and relieve symptoms of hay fever. A series of preventive injections (desensitization or hyposensitization) may be recommended in advance of the hay fever season. This consists of administering controlled and gradually increasing amounts of the offending substance in order to develop a certain amount of immunity. Air conditioning may help give relief by filtering much of the pollen from the air.
nonseasonal hay fever (perennial hay fever) nonseasonal allergic rhinitis.

hay fe·ver

a form of atopy characterized by an acute irritative inflammation of the mucous membranes of the eyes and upper respiratory passages accompanied by itching and profuse watery secretion, usually without temperature elevation, followed occasionally by bronchitis and asthma; the episode recurs annually at the same or nearly the same time of the year, in spring, summer, or late summer and autumn, caused by an allergic reaction to the pollen of trees, grasses, weeds, flowers, etc.
Synonym(s): allergic coryza

hay fever

n.
An allergic condition affecting the mucous membranes of the upper respiratory tract and the eyes, most often characterized by nasal discharge, sneezing, and itchy, watery eyes and usually caused by an abnormal sensitivity to airborne pollen. Also called pollinosis.

hay fever

Etymology: AS, heawan, to hew; L, febris, fever
Usage notes: (informal)
an acute, seasonal, allergic rhinitis stimulated by tree, grass, or weed pollen. Also called pollen coryza, pollinosis. See also allergic rhinitis, organic dust.

allergic rhinitis

An inflammatory response in the nasal passages to allergens, which is the most common form of atopic-allergic disease, affecting 5–20% of the general population. Allergic rhinitis is initiated by exposure of the nasal mucosa to airborne antigens, evoking IgE production; upon repeated re-exposure to the allergen (e.g., ragweed pollen), histamine, leukotrienes C4, D4, E4, B4, PGD2, kinins, kininogen and serotonin are released.

Allergic rhinitis is the most widely used of a plethora of terms referring to the effect of allergens on the upper respiratory tract, in particular the nasopharynx. It is often related to environmental antigens—most commonly pollen—thus being known as seasonal allergic rhinitis (colloquially known as hay fever), and less often to “constant” allergens, in which case it is designated perennial allergic rhinitis.

Clinical findings
Paroxysms of sneezing, nasal congestion, nasal and ocular pruritus, tearing, rhinorrhoea, anosmia, ageusia, postnasal drip (which may cause coughing), partial or total obstruction of airflow, throat clearing, and allergic periorbital hematomas (black eyes).
 
Diagnosis
Skin testing with appropriate inhalant allergens is of greater use than measuring serum IgE.
 
Management
Avoid allergens; antihistamines (especially H1-receptor antagonists); sympathomimetic amines; anticholinergics; corticosteroids; decongestants; cromolyn sodium; immunotherapy.

Pathogenesis
Unclear; possibly a hypersensitivity response to allergens in pollen, dander, mites, insects, mould spores, foods; most patients have circulating IgE antibodies that bind to high-affinity receptors on mast cells and basophils, and to low-affinity receptors on other cells, evoking release of inflammatory mediators.

hay fever

A popular term for a seasonal allergic rhinitis caused by pollen and characterized by itching and tearing of eyes, swelling of nasal mucosa, attacks of sneezing, often asthma. See Allergic rhinitis.

hay fe·ver

(hā fē'vĕr)
A form of atopy characterized by an acute irritative inflammation of the mucous membranes of the eyes and upper respiratory passages accompanied by itching and profuse watery secretion, followed occasionally by bronchitis and asthma; the episode recurs annually at the same or nearly the same time of the year, in spring, summer, or late summer and autumn, caused by an allergic reaction to the pollen of trees, grasses, weeds, and flowers.

hay fever

A term remarkable for its imprecision, the condition being neither a fever nor caused by hay. See ALLERGIC RHINITIS.

hay fever

an allergic reaction to atmospheric dust and pollen. Hay fever causes watery eyes, sneezing, etc., due to inflammation of the mucous membranes of the eyes and nose.

Bostock,

John, English physician, 1773-1846.
Bostock catarrh - Synonym(s): allergic rhinitis; hay fever
Bostock disease

hay fever,

n pollen allergy that occurs seasonally that includes sneezing, congestion, and itching of the eyes, ears, nose, and throat due to release of histamines. Antihistamines help con-trol this condition. Also called
pollenosis or
seasonal allergic rhinitis.

hay fe·ver

(hā fē'vĕr)
A form of atopy characterized by an acute irritative inflammation of the mucous membranes of the eyes and upper respiratory passages accompanied by itching and profuse watery secretion, followed occasionally by bronchitis and asthma.

hay fever,

n an acute seasonal allergic rhinitis, stimulated by tree, grass, or weed pollens. Also called allergic rhinitis.

Patient discussion about hay fever

Q. I have chronic hayfever problems in the mornings for the first hour.Seems to be a correlation with dairy produ I also got asthma 8 years ago at age 69, after having 2 pet cats. It is controlled with 2 puffs of Symbicord daily, am & pm. Anyone managed a complete cure?

A. Hey lixuri,you mean to tell me after after 25yrs as a therapist,All my patients had to do is drink water all day.i love it,how long does it take to work,an what does the patient do in the mean time if they have a asthmatic attack(drink WAter while you cant breath?-PLEASE SEND ME AN AANSWER.---mrfoot56.

Q. Regarding Seasonal Nasal allergy. My father is suffering from seasonal nasal allergies. He took a 24-hour loratadine pill, 5 hours ago. His nose is still running just like it was. Can I take a benedryl, or is it dangerous to mix loratadine and benedryl? What else can I do to stop my nose?

A. except well known drug interactions- most Dr. check it out with a computer program they have. you need to ask a Dr. or a pharmacist about it. but i can tell you that if you wait 4 times the T1/2 - that is enough to consider the drug out of the system.

Q. is seasonal allergies are treatable?

A. here is the link to the Merck manual about that-
http://www.merck.com/mmhe/sec16/ch185/ch185b.html

More discussions about hay fever
References in periodicals archive ?
During exposure to pollen allergic people develop higher levels of the corresponding IgE antibody, which goes along with increasing hay-fever symptoms.
The researchers speculate that a lag-time of at least five weeks prior to pollen exposure is required for Pycnogenol to defy hay-fever symptoms.
There are some simple things that a driver can do if he or she is having a bad hay-fever day.
It's equally important to check that any medication you take for hay fever is suitable to use if you're going to drive, as many hay-fever remedies are known to cause drowsiness.
She needs asthma-preventer and reliever drugs all year and in spring and summer adds daily hay-fever tablets and antihistamine eye drops and nose spray.
The peak hay-fever season is mid-June, which coincides with school examinations.
By June grass pollen will fill the atmosphere, prompting almost all with a susceptibility to hay-fever to fall victim.