Excuse me, what is a lesion?

The diseased part of the body. If a part of the lung is destroyed by tuberculosis, this part is the focus of tuberculosis. Local pathological tissues with pathogenic microorganisms are called lesions. Pathological changes in the human body not only do harm to the human body, but also often bring trouble and cause pathological changes in distant organs. This is called "focus infection" in medicine. Lesions generally exist in the form of chronic inflammation, which can be static or active "base" of infection. In medical popular science articles, readers often encounter a term: "focus". What exactly is this lesion? Local pathological tissues with pathogenic microorganisms are called lesions. They are like "bandits' caves", hidden in a "corner" or a certain part of the body, harboring pathogenic bacteria or other pathogenic microorganisms. Pathological changes in the human body not only do harm to the human body, but also often bring trouble and cause pathological changes in distant organs. This is called "focus infection" in medicine. Lesions generally exist in the form of chronic inflammation, which can be static or active "base" of infection. Pathological changes in any tissues and organs of the human body will become the focus. Such as periodontal disease, gingivitis, periodontitis, osteomyelitis, chronic tonsillitis, sinusitis, cholecystitis and chronic appendicitis. , are often the focus of trouble. Although there are pathogens in the focus, they can only harm the tissues in this area at ordinary times. But when tooth extraction surgery, upper respiratory tract infection, overwork, that is, the human body's resistance decreased, they made waves and began to attack. They have two offensive routes. One is through "water transport", that is, through blood and lymph, so pathogens "cross the ocean" along blood vessels and lymphatic vessels and come to distant organs and tissues, where they "camp" and cause new infections; Another route of their "attack" is to "cast toxins", which is more powerful. Toxins and metabolites produced by pathogens in the focus become "antigens" and then stimulate the human body to produce corresponding "antibodies". The reaction between antigen and antibody will also bring serious harm to human body. Common diseases caused by pathological changes include subacute endocarditis, rheumatism, rheumatoid arthritis, erythema multiforme and chronic nephritis. When the exact causes of many diseases can't be found in clinic, doctors often find hidden lesions in the body through consultation and various examinations or tests, and deal with suspicious lesions accordingly. For example, when suffering from acute nephritis, the possible cause is tonsil inflammation, so doctors should also inject penicillin into patients while treating acute nephritis to control the inflammatory symptoms near the throat. This is a fact. Of course, it may not be too difficult to treat these lesions, but it is not easy to treat the bane it causes. Therefore, toothache, tonsillitis and other diseases should not be taken lightly and should always be treated actively.