Most patients with nasal disorders visit the clinic because of nasal obstruction, hoping to restore smooth breathing through various treatments, so is nasal obstruction a disease or not? Why are some patients very unsatisfied with the treatment. This starts with what is nasal obstruction. Our nasal cavity is the humidifier, air conditioner and air purifier of our body, which plays the role of humidification, heating and dust removal and purification of breathing air. The first thing to correct is that if we take a closer look at our nasal cavity, or search online for a schematic diagram of the nasal structure, we can find that our nasal cavity is not an imaginary cavity, but has many protrusions, called the upper, middle and lower turbinates. Why should there be such a complex anatomy in the small nasal cavity? It is currently believed that the surface area of the nasal mucosa can be increased on a large scale, expanding our humidifiers, air conditioners and air purifiers. Furthermore to enhance such an effect requires air to circulate as much as possible in the nasal cavity, which leads to the concept of nasal resistance, which facilitates close contact of airflow with the surface of the nasal mucosa, which is rich in blood supply. The diameter of the main part of the nasal cavity, located posterior to the nasal valve, is mainly controlled by the degree of filling of the capillary network and the volume vessels in the nasal mucosa. The vascular response controlling the degree of swelling of the nasal mucosa is regulated by the sympathetic nervous system, and sympathetic stimulation of the nasal cavity bilaterally shows asymmetrical periodic activity, resulting in periodic changes in nasal resistance, or the nasal cycle. So most people feel this way, with alternating degrees of nasal patency. The duration of the nasal cycle is 2-7 h. It is caused by the alternating process of congestion and decongestion of the nasal mucosa under sympathetic modulation and is more pronounced in adolescence, its amplitude being most pronounced after lying down and diminishing after standing upright. This is what many patients will experience, lying down the nose is not ventilated. Changes in body position can lead to changes in venous pressure and sympathetic state, thus affecting the thickness of the nasal mucosa. When the body is in the lateral position, the resistance of the lower nasal cavity rises due to the pressure on the pressure receptors located on the side of the body and in the skin of the axilla, causing the corresponding neural reflexes. Emotional factors can also regulate nasal resistance through the sympathetic nervous system, emotional instability can lead to increased nasal secretions and mucosal congestion. The same changes occur with cold air stimulation. The other physiological significance of nasal resistance: the resistance of the airway to airflow helps the lungs to be in an optimal state of expansion, thus completing gas exchange. Nasal resistance is about 40% of the total resistance of the airway. Although nasal airflow resistance is higher than oral airflow resistance, most adults (85%) are still accustomed to breathing through the nose. Well understanding the above physiological functions, we can first have a correct understanding of nasal obstruction, nasal resistance is a normal physiological phenomenon of our people. Then what degree of nasal obstruction should go to treatment? I suggest that poor ventilation on the more fixed side often suggests the possibility of nasal septal deviation or nasal neoplasm, combined with purulent discharge and odor in the nasal cavity. 1. There are very many causes of nasal obstruction, first of all, we must talk about psychological factors, which must be ruled out when choosing surgery. Nasal obstruction itself is a feeling, so we all have the experience of feeling breathless when we are nervous and depressed, while even if the cold is very nasal, we do not feel anything when we are excited. I have seen many young male patients who had multiple nasal surgeries, and the inferior turbinates were cut out, and when they breathe, the people across the room can obviously feel the nasal airflow, but they still feel breathless, and there are many doctor-patient disputes over this. Therefore, before consulting a doctor, you should ask yourself, 1. whether my nasal cavity is often not ventilated, and whether there is airflow in the nasal cavity when I feel not ventilated (you can test it with cotton thread in the nostril); 2. how much nasal non-ventilation affects my life; 3. whether I have frequent open-mouth breathing; 4. can I understand that nasal resistance is a normal physiological function? 2. The most common ones are deviated septum, chronic rhinitis, allergic rhinitis, and the most controversial areas of treatment, often talking about inferior turbinate hypertrophy, deviated septum, so much deviated septum, how much inferior turbinate should be treated. Many misleading advertisements use all kinds of high-tech terms, resulting in many patients receiving inappropriate and incorrect treatment, spending some money is a small matter, but the serious thing is to cut the inferior turbinate that should not be cut, is ventilated, but brings the dry nose, nasal mucosa atrophy, a lot of secretion retention, more pain, serious become atrophic rhinitis. My advice: 1. deviated nasal septum: deviated septum obviously leads to narrowing of the nasal cavity on one side, and there is more frequent poor ventilation on that side, the examination and diagnosis are consistent with the possibility of surgery; 2. inferior turbinate hypertrophy: endoscopy is seen with obvious polypoid changes; the use of nasal constrictors is ineffective; regular drug therapy is ineffective; appropriate surgical excision is possible. 3. allergic rhinitis: surgery can improve ventilation and reduce allergy symptoms in the short term, but it cannot replace medication, can not be cured, if not with medication, will relapse. 3, sinusitis: purulent secretions, hypertrophic nasal mucosa are the cause of nasal obstruction. Treatment drugs, surgery, drugs nasal cavity, sinus swelling: diagnosis, surgery nasopharyngeal diseases: adenoid hypertrophy, nasopharyngeal neoplasia post-traumatic anterior nostril stenosis, atresia congenital posterior nostril atresia 4, post-surgical nasal obstruction Many patients after surgery instead feel that nasal ventilation is not as good as before, the reasons here are more complex and require specific analysis, the common is poor post-operative drug therapy, sinusitis nasal polyps recurrence, or surgical removal or inadequate septum correction (need to be judged with caution), resulting in secretion retention, mucosal inflammation is not lifted; followed by nasal adhesions; and removal or destruction of too much nasal mucosa, sensory dullness, resulting in no sensation despite air flow; and finally, the psychological factors that I emphasize. Nasal obstruction is a common nasal symptom and one of the normal physiological functions of the human nasal cavity, caused by a variety of objective disease factors, but also the subjective psychological role involved. The cause should be clearly identified and treated, not just “cut”. It is recommended that the inferior turbinate should be treated with caution.