It is mainly based on the following three theories: it believes that irradiating the body with weak laser with appropriate wavelength and certain power density can cause the body's reaction, that is, the biological effects of laser, such as biological stimulation effect and photochemical effect, and then use these biological effects to treat diseases and protect health. These effects have certain rules. According to these, the functional parameters of this instrument are selected and set, so as to ensure the effect of treatment and health care. If you have ischemic and hypoxic diseases, you should go to the hospital for treatment in time to ensure that the condition is controlled and improved. However, because the treatment and rehabilitation of such diseases need a long course of treatment, most patients cannot be hospitalized for a long time, and it is not appropriate to take drugs for a long time. Some patients often relapse after a period of time after their condition is controlled and improved, so they need repeated treatment or even lifelong medication. Using the Northern Lights Rhinitis Therapeutic Apparatus, patients can get auxiliary treatment and long-term care at home, thus consolidating and improving the curative effect, further alleviating the illness, promoting rehabilitation, reducing medication, avoiding the toxic and side effects of drugs, enhancing immunity and preventing the recurrence of diseases. If the instrument is used for nursing when symptoms appear, the deterioration of the disease can be controlled in time, the pathological process can be reversed and the effect of self-rehabilitation can be achieved. This instrument is a kind of health care means widely suitable for middle-aged and elderly people. The middle-aged and elderly people in sub-health state can adjust blood lipid, blood sugar and blood pressure, restore normal physiological function and improve immune function, thus preventing the occurrence of ischemic and hypoxic diseases. For ordinary middle-aged and elderly people, it has the effects of delaying aging, promoting digestion, strengthening the body, calming the nerves and helping sleep.