Rhinorrhea

Rhinorrhea
Classification and external resources
ICD-9	478.19
DiseasesDB	26380
MedlinePlus	003051

Rhinorrhea, commonly referred to as runny nose, consists of a significant amount of nasal fluid. It is a symptom of the common cold and of allergies (hay fever). The term is a combination of the Greek words "rhinos" meaning "of the nose" and "-rrhea" meaning "discharge or flow". Rhinorrhea can also be a sign of withdrawal, such as from opioids (especially methadone). Symptoms display circadian rhythms.

Overview

Rhinorrhea is a frequently encountered condition that is usually not dangerous. The discharge may be coloured or thick as a result of conditions such as sinusitis. It may be accompanied by post-nasal drip that may also aggravate coughing or result in a sore throat. Other secondary consequences include ear infections or sinusitis, especially if increased mucus levels block the Eustachian tube or the sinus passages.

Causes

Rhinorrhea may be due to allergic conditions such as hay fever or foreign materials within the nostril. Bacterial or viral infections such as the common cold, influenza or sinusitis may also be accompanied by a runny nose. Nasal discharges may also be present in cases of vasomotor rhinitis, a non-infectious and non-allergenic condition.

Head injuries may also cause excess nasal discharges. Basilar skull fracture may result in cerebrospinal fluid rhinorrhea.

Environmental causes include contact with strong smelling substances such as disulfide compounds found in onions and garlic, both of the genus Allium. CS gas, which provides an especially intense pepper-like odour, also results in this symptom. This phenomenon is caused by the same mechanism that causes a runny nose when crying: tears drain through the inner corner of the eyelids through the nasolacrimal duct, and finally into the nasal cavity, where they manifest as a runny nose. Spicy food can also be to blame, as well as exposure to cold air, both of which can cause tearing.

Additional factors are temperature related: if the climate is dry or the air in one's vicinity becomes especially dry, the nose reacts by producing more mucus. The nose also tends to run when one is exposed to very cold temperatures; this is because the air in your nose is warmer than the outside air and a steam-like effect is brought on inside the nose; water drops then condense, mix with mucus, and run out of the nose.

Treatment

Medicinal treatment includes antihistamines (e.g., diphenhydramine or loratadine) to reduce the amount of nasal discharge and saline nasal sprays. Vasoconstrictor nasal sprays may also be applied for a limited time, but their use may become counterproductive after several days, causing Rhinitis medicamentosa.

Nasal irrigation is also said to help reduce nasal congestions. It involves rinsing the nasal cavity regularly with salty water, or preferably hospital grade saline. This remedy may cause further irritation.

See also

• Catarrh

External links

• Runny Nose: A Guide for Parents, The Institute for Good Medicine at the Pennsylvania Medical Society
• Cold and flu advice (NHS Direct)

id:Rhinorrhea ur:جارانفی