What is abnormal immune function?

Immunity refers to the function of the body's immune system to recognize itself and foreign substances, and to exclude antigenic foreign substances through immune reaction to maintain the physiological balance of the body. Immunity is a physiological function of the human body, and the human body relies on this function to identify "self" and "non-self" components, thus destroying and rejecting antigen substances entering the human body, or damaged cells and tumor cells produced by the human body itself, thus maintaining human health. The functions of the immune system are mainly manifested in three aspects, namely, defense function, stability function and immune monitoring function. Once these functions are out of balance, an immunopathological reaction will occur. When the self-stabilization function is too high, you may suffer from immune system diseases, such as rheumatoid arthritis; If the defense function is too high, allergic reaction will occur, and if it is too low, immune deficiency syndrome will occur; When the immune monitoring function is too low, tumors may be formed. Thank you for your adoption.