People with high immunity are characterized by a better state of mind and stronger resistance, but excessive immunity may lead to allergic reactions or autoimmune diseases. The body’s immunity can be expressed in the ability to resist foreign microorganisms as well as the ability to remove necrotic tissue, repair its own cells, and conduct tumor cell surveillance. A high immune system means that the body is not susceptible to disease, or the symptoms are not very severe and can be cured quickly, but when the immune system is too high, it can lead to the development of a number of diseases. For example, high immunity often causes allergic reactions, may appear for pollen, food, drugs, dust and other substances, resulting in hives, allergic rhinitis, allergic asthma and other diseases; may also lead to rheumatoid arthritis, systemic lupus erythematosus and other autoimmune diseases, rashes, joints, pain and other symptoms. Excessive immunity is also an important reason for the imbalance of the immune system, so we should pay attention to our diet in our daily life, eat more fresh fruits and vegetables, such as apples, tomatoes, etc., maintain a regular work and rest, and appropriate outdoor activities. When physical discomfort occurs, it is necessary to go to the rheumatology and immunology department of the hospital in a timely manner to avoid serious damage to the body.