Normally, the mucous membrane of the human nasal cavity secretes mucus from time to time to moisten the membranes of the nasal cavity, moisten the inhaled air, and stick to the dust and fine dust and microorganisms inhaled by the air, which is snot.

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Normal people secrete about hundreds of milliliters of nasal mucus every day, but these nasal mucous membrane cilia in the direction of movement, flow to the back of the nose hole to the pharynx, coupled with the evaporation and drying, generally can not be seen from the nasal cavity out of it. In fact, when a cold runny nose is the body a natural cleansing effect, taking medication can certainly stop the nasal congestion and other uncomfortable symptoms, but also undermine this natural mechanism, many people like to use the inhalation of steam to improve the sniffles of the troubled, but it is a money-saving and can be a temporary solution to the congestion of the nose.

A runny nose is most commonly seen in rhinitis, nasal polyps, and sinusitis. Common causes of a runny nose include:

1, colds, initially watery or mucous, and pus can appear in the later stages of a cold .

2, chronic rhinitis: snot is mostly mucous. The amount can be more or less,

3, allergic rhinitis: for the flow of watery runny nose, the amount of more, accompanied by sneezing, nasal itching, can be perennial episodes, can also be seasonal episodes. Allergic rhinitis patients can be accompanied by asthma, especially children.

4, chronic sinusitis, mostly mucopurulent secretions, bilateral or unilateral, accompanied by nasal congestion, dizziness, memory loss. Unilateral sinusitis should be considered odontogenic sinusitis.

5. Nasal polyps can also be accompanied by runny nose and pus when infected, which can be accompanied by nasal congestion, dizziness and memory loss.

6, pediatric secretion is more vigorous, if there is no other discomfort, may be cold air stimulation of the nasal cavity caused by, do not need special treatment. Unilateral nasal congestion with blood in the snot may be caused by a foreign body in the nasal cavity.

7, the flow of yellow watery secretion, to consider the possibility of sinus cysts, sinus X-ray or CT.

8, blood in the runny nose can be referred to the common causes of nosebleeds.

9, other causes also include cerebrospinal fluid nasal leakage, atrophic rhinitis, the latter to the nose dry crust-based, thick nasal snot, less and odor.

The cold and flu cause a runny nose which is well known. But why do some people still often have a runny nose after a cold? Cold and flu runny called acute rhinitis, this time the nasal mucosa congestion and swelling, gland secretion increased that is the formation of nasal mucus. At first, it is clear water-like, and after 3 to 5 days, it becomes pus, and can be cured after 1 to 2 weeks. If the acute rhinitis repeated episodes, nasal mucosa long-term congestion and swelling or even hypertrophy, that is, chronic rhinitis, will often runny nose.

When there is snot in the nose, you should ask the child to blow it out. To have the right way to blow the nose, hold down one nostril and blow side by side. If the nasal passages are clear, the snot in the paranasal sinuses cannot be easily blown out, and the pus in the nose can enter the paranasal sinuses or the Eustachian tube, resulting in otitis media.

The vasoconstrictor drugs such as ephedrine can reduce the snot, but patients with atrophic rhinitis should not use this kind of drugs. Drops of medicine to prevent the liquid into the mouth, because the child feels the bitter taste, will not let the drops of medicine later. It is also necessary to have the correct posture for dropping the medicine in order for it to drip evenly into the nasal cavity without flowing out quickly. Paranasal sinusitis with excessive nasal discharge can be treated in the hospital with replacement therapy or puncture irrigation.