It is generally said that there are three factors that contribute to the occurrence of allergic diseases. One is the genetic factor. Allergic patients are generally genetically allergic, and many rhinitis and asthma patients have a family history. The second is the continuous stimulation of allergens. There are many people who are allergic to a substance only after the age of thirty or even forty or fifty, and allergens need to have a process of accumulation. The third is environmental and physical factors. People with the two conditions mentioned above are often triggered by allergies when they are exposed to an environment with a high concentration of allergenic substances, or when they are in poor physical condition, mentally stressed, overworked, poor sleep, etc. In general, it is said that allergies occur without one of the three factors mentioned above. Allergy means that the body has an “abnormal reaction” to a foreign substance. The word “abnormal” is emphasized here because the body’s ability to react normally is necessary to maintain life. If the body does not have this ability to react (allergy), then a person can become seriously ill from a very small infection. Even death. A healthy reaction is called a “normal reaction”, that is, the ability to react normally. The prerequisite for the development of allergic diseases is the presence of allergens, which are factors that approach the body’s tissues from the outside and cause disease. However, whether an allergy occurs, what type of allergy occurs, and how severe it is depends entirely on the “abnormal” reaction readiness of the individual tissues. Most people do not react to the allergen causing factor (allergen), but the number of “abnormal reactions” has been increasing.