Understanding Nasal Allergies

Nasal allergies (also called allergic rhinitis) are a common health problem. They may be seasonal. This means they cause symptoms only at certain times of the year. Or they may be perennial. This means they cause symptoms all year long. Other health problems, such as asthma, often occur along with allergies as well.

Cross section side view of head showing allergens entering nose, swollen nasal lining, and fluid dripping from nasal lining.

What is an allergic reaction?

An allergy is a reaction to a substance called an allergen. Common allergens include:

  • Wind-borne pollen

  • Mold

  • Dust mites

  • Furry and feathered animals

  • Cockroaches

Normally, allergens are harmless. But when a person has allergies, the body thinks they are harmful. The body then attacks allergens with antibodies. Antibodies are attached to special cells called mast cells. Allergens stick to the antibodies. This makes the mast cells release histamine and other chemicals. This is an allergic reaction. The chemicals irritate nearby nasal tissue. This causes nasal allergy symptoms.

Common nasal allergy symptoms

Allergies can cause nasal tissue to swell. This makes the air passages smaller. The nose may feel stuffed up. The nose may also make extra mucus, which can plug the nasal passages or drip out of the nose. Mucus can drip down the back of the throat (postnasal drip) as well. Sinus tissue can swell. This may cause pain and headache. Common allergy symptoms include:

  • Runny nose with clear, watery discharge

  • Stuffy nose (nasal congestion)

  • Drainage down your throat (postnasal drip)

  • Sneezing

  • Red, watery eyes

  • Itchy nose, eyes, ears, and throat

  • Plugged-up ears (ear congestion)

  • Sore throat

  • Coughing

  • Sinus pain and swelling

  • Headache

It may not be allergies

Other health problems can cause symptoms like those of nasal allergies. These include:

  • Nonallergic rhinitis and viruses such as colds

  • Irritants and pollutants, such as strong odors or smoke

  • Certain medicines

  • Changes in the weather


Your healthcare provider will evaluate you to find the cause of your symptoms then recommend treatment. If your symptoms are due to nasal allergies, your healthcare provider may prescribe nasal steroid sprays or oral antihistamines to help reduce symptoms. Avoidance of the allergen will also be suggested. You may also be referred to an allergist.