Rhinitis, non-allergic

Rhinitis is a condition where the inside of your nose swells or becomes inflamed. This can cause cold-like symptoms such as sneezing, itchiness and a blocked or runny nose.

One of the most common causes of rhinitis is an allergic reaction to something, such as pollen. This type of rhinitis is known as allergic rhinitis. See the links section for more information about allergic rhinitis.

Types of non-allergic rhinitis

There are several different types of rhinitis that don't involve an allergic reaction. These types of rhinitis are known as non-allergic rhinitis.

The different types of non-allergic rhinitis are listed below.

• Viral or infectious rhinitis is rhinitis that is caused by an infection, such as the common cold.
  
• Vasomotor rhinitis is a condition in which the blood vessels in your nose are over-sensitive. Certain environmental triggers, such as cold weather or smoke can cause them to expand and fill your nose with mucus.
  
• Atrophic rhinitis is a form of rhinitis where the membranes inside your nose thin (atrophy) and harden. This causes your nasal passages to widen and dry out. Foul smelling crusts form inside your nose and you may lose your sense of smell. Atrophic rhinitis can occur as a complication of nose surgery or as a result of infection.
  
• Rhinitis medicamentosa is a type of rhinitis that's often caused by over-use of nasal decongestants.

Non-allergic rhinitis can also be caused by eating spicy food or as a side effect of certain medications, such as aspirin or beta-blockers. It can also occur as a result of imbalances in the hormonal system caused by pregnancy, puberty or an over-active thyroid gland.