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Allergic rhinitis is a collection of symptoms, mostly in the nose and eyes, which occur when you breathe in something you are allergic to, such as dust, dander, or pollen.

Alternative Names
Hay fever; Nasal allergies

Causes

An allergen is something that triggers an allergy. When a person with allergic rhinitis breathes in an allergen such as pollen or dust, the body releases chemicals, including histamine. This causes allergy symptoms such as itching, swelling, and mucus production.

Hay fever involves an allergic reaction to pollen. (A similar reaction occurs with allergy to mold, animal dander, dust, and similar inhaled allergens.)
The pollens that cause hay fever vary from person to person and from region to region. Large, visible pollens are seldom responsible for hay fever. Tiny, hard to see pollens more often cause hay fever. Examples of plants commonly responsible for hay fever include:

• Trees (deciduous and evergreen)
• Grasses
• Ragweed

The amount of pollen in the air can play a role in whether hay fever symptoms develop. Hot, dry, windy days are more likely to have increased amounts of pollen in the air than cool, damp, rainy days when most pollen is washed to the ground.

Some disorders may be associated with allergies. These include eczema and asthma.

Allergies are common. Your genes and environment may make you more prone to allergies.

Whether or not you are likely to develop allergies is often passed down through families. If both your parents have allergies, you are likely to have allergies. The chance is greater if your mother has allergies.

Symptoms

• Itchy nose, mouth, eyes, throat, skin, or any area
• Problems with smell
• Runny nose
• Sneezing
• Tearing eyes

Symptoms that may develop later include:

• Stuffy nose (nasal congestion)
• Coughing
• Clogged ears and decreased sense of smell
• Sore throat
• Dark circles under the eyes
• Puffiness under the eyes
• Fatigue and irritability
• Headache
• Memory problems and slowed thinking

Complications

• Sinusitis