How is upper rostrum infection caused? When the organism or the local anesthesia defense ability is reduced, the original existence of the virus and bacteria in the upper rostral tract live outside invasion can be rapidly reproduced, resulting in the onset of the disease, especially the old and young and frail or have chronic respiratory diseases such as paranasal sinusitis, tonsillitis, are more likely to suffer from this disease. Causes of upper respiratory tract infections 1, viral infections: most of the upper respiratory tract infections are caused by viral infections, mainly influenza virus, parainfluenza virus, respiratory syncytial virus, adenovirus, rhinovirus, arbovirus, measles virus, rubella virus. Bacterial infection can occur directly or after viral infection, hemolytic streptococcus is common, followed by Haemophilus influenzae, pneumococcus, and staphylococcus and occasionally gram-negative bacilli. 2, low immunity: a variety of causes of the whole body or inhalation tract local defenses are reduced, such as cold, rain, overwork and other triggering factors, so that the whole body or inhalation tract local defense function is reduced. How to improve immunity 1, comprehensive and balanced nutrition: vitamin A can promote the synthesis of glycoprotein, cell membrane surface protein is mainly glycoprotein, immunoglobulin is also glycoprotein. Today’s urbanites are reluctant to eat pig liver, which is rich in vitamins, vitamin A intake is insufficient, the whistle epithelial cells lack resistance, often prone to disease. Enhance immunity fruits and vegetables vitamin C deficiency in the white blood cell vitamin C content is reduced, the white blood cell fighting force is weakened, the human body is prone to disease, in addition to trace elements, vitamin B1/B2 and other elements are related to the human body non-specific immunity. 2, moderate labor and leisure: moderate labor and leisure is the mother of health, the normal functioning of the human biological clock is a health guarantee, and the biological clock is the wrong point is the beginning of sub-health. 3, often exercise: modern people are keen on urban life busy career, physical exercise time is less and less, strengthen the self-exercise can improve the body’s resistance to disease. 4, learn to relax: tension will promote the secretion of adrenocorticotropic hormone, resulting in immune feedback disorder. Some people in the test, before the job often easy to be such as colds and other knockout, this is because the tension induced by anxiety to limit the role of immune cells. The immune system is also governed by emotions and feelings, so it is important to maintain an optimistic state of mind. Negative, emotional, nervous and allergic people tend to have weaker immune systems and are prone to disease.