There are many small organisms in nature and in human body, they are so small that they are invisible to our naked eyes and often can only be found under a microscope with thousands of times magnification, so these tiny organisms are called microorganisms in medical science, like bacteria, viruses, etc. are microorganisms. And cells are the smallest functional unit in the human body, it is very complex division of labor, different cells look and act differently, almost all important organs in the human body are made up of different cells. Cells are also small and require a microscope to be seen, but are generally much larger than bacteria and viruses. There are some microorganisms that invade the human body at every opportunity, using the cells in the body as their home and the proteins and other substances inside the cells as their food. But when they are full, they will damage these cells, so that the cells are damaged, death, medically known as “cell necrosis”, cell necrosis to a certain number of people will be fever, illness, and in serious cases, death. How to deal with these very small and intimidating microorganisms? Through long-term evolutionary action, the human body has developed a very complex system called the immune system to deal specifically with these microorganisms. The immune system is mainly composed of a group of very specialized cells called immune cells, which often like to gather together to form immune organs called lymph nodes, thymus, spleen, etc. These immune organs are connected by some specialized ducts called lymphatic vessels. It is only in these immune organs that the immune cells can function to their full potential. Since bacteria and viruses are also very different, some approaches may be very effective for one type of bacteria, but may not work at all for another type of bacteria. Therefore, the division of labor of immune cells is also very detailed, there are some cells usually specializing in ambush in the place where harmful microorganisms are often found, responsible for “catching the bad guys”. They analyze the characteristics of different “bad guys” and then quickly transfer them through the lymphatic vessels to the lymph nodes or spleen, where the results are submitted to another group of cells that produce cells and molecules specifically designed to kill bacteria or viruses. Finally, these highly potent cells and molecules will run to the site of the “bad guys” and kill the harmful microorganisms, and the person is restored to health. The immune system is very, very powerful, it effectively protects our health, but also has a strong memory function, once infected with a certain bacteria, the immune system will write down its characteristics, and save it. The next time you are infected with the same bacteria, the immune system does not need to go through the process of “capture” and “analysis”, but to activate the cells in its memory bank and directly produce killer cells and kill molecules, which greatly improves the speed and efficiency. Modern medical research has not only enabled people to understand this process, but also to use it effectively, for example, the production of vaccines is a miracle. Scientists first kill bacteria or viruses, or remove their virulence, and then allow them to invade the body by artificial means. Immune cells then remember the characteristics of these bacteria or viruses, and when a real bacteria or virus infects, the body’s immune system is then fully prepared to kill them quickly without making the body sick. If one has been vaccinated against measles, whooping cough, tetanus, etc., one is protected against these types of bacterial infections. It is also the fact that we have the influenza A vaccine that makes people less afraid of this terrible infectious disease. As powerful as the immune system is, the body also pays a high price. Because the harmful microorganisms invade the human cells will make the healthy cells necrotic, some substances inside the cells will be released, the immune cells in the capture of the “bad guys” at the same time, the useful things in their own healthy cells will also be captured together, the immune system will be “indiscriminate The immune system will “indiscriminately” kill its own cells along with the harmful microorganisms. Some bacteria grow something inside their bodies that is the same as or similar to our normal cells, and this is when the immune system is also unable to distinguish the two meticulously. This way, the immune system from time to time produces cells that kill healthy cells in the body and make people sick, which in medical terms is called rheumatic immune disease. Rheumatic immune diseases are a large group of diseases in the human body, which can damage various tissues and systems throughout the body and have various manifestations, including fever, swollen and painful joints, mouth ulcers, skin rashes or ulcers, stomach pain, anemia, bleeding, hematuria, proteinuria, and even chest tightness, breath suffocation, headache, etc. Therefore, patients often visit orthopedics, gastroenterology, nephrology, hematology, or respiratory departments in hospitals. In fact, modern medicine’s have a deep understanding of such diseases, namely that they are due to abnormal activation of the body’s immune system, which produces immune cells and immune molecules that target their own healthy cells. Scientists have discovered that rheumatic immune diseases can be alleviated or even cured by controlling the production of immune system killer cells and molecules, so many doctors and scientists around the world are specializing in researching how to artificially control the immune system in order to prevent or treat rheumatic immune diseases. Many tests and drugs have now been developed, and many hospitals have established or are in the process of establishing special departments to treat rheumatic immune diseases. These departments are generally called rheumatology and immunology departments, and have a success rate of over 90% in the diagnosis and treatment of rheumatic immune diseases. In fact, the incidence of rheumatic immune diseases is very high, involving more than 100 kinds of diseases, and about 10% of the population suffers from various rheumatic immune diseases, but unfortunately, because patients do not yet understand these diseases, and often first consult the orthopedics, hematology, nephrology and other departments, especially in some poor conditions of the hospital, it is more likely to delay the disease, delayed treatment, so it is recommended that Therefore, it is recommended that patients with the above-mentioned symptoms should visit the rheumatology department as soon as possible to see if they have rheumatic immune diseases.