The concept of cell necrosis is broad because cells form a basis for tissues and organs, so the clinical symptoms that result from necrosis in different parts of the body are different. From the point of view of intestinal cell metabolism, the body, as cells continue to die, there will be new cells produced. As an example, patients who play sports, after strenuous exercise, the body will produce pain, at this time there will be some muscle cells die, and this soreness will be relieved after a few days, because there are new muscle cells produced, so this cell metabolism is normal, there are new cells produced and old cells die. If it refers to tissue necrosis, local symptoms of redness, dark purple, blackness, sourness and putrefaction will occur.