Each of us has a number of mutated cells that are produced in our bodies at any time. When the body’s immune function is normal, it can recognize and clear them to keep the body healthy. However, if there are genetic defects, excessive fatigue or lack of necessary exercise, improper diet or damage from smoking and alcohol, drug abuse, depression or anxiety, etc., the body’s immune system will be affected and its defense capability will be weakened over time, and some mutated cells will accumulate and increase, grow continuously, accumulate into clumps, and even become cancerous. People sometimes hear doctors say the words “precancerous state” or “precancerous lesion”. Precancerous state refers to the condition that is prone to cancer, such as: esophageal mucosal leukoplakia, pernicious anemia with gastritis, chronic atrophic gastritis, hyperplastic gastritis, residual gastritis or partial gastric ulcer, colon polyp (especially >2cm broad-based adenomatous polyp). Precancerous lesions, on the other hand, refer to histopathological changes that are more likely to turn into cancer, mainly referring to atypical hyperplasia of tissue cells, also called heterogeneous hyperplasia, found under electron microscopy after pathological examination. For example, Barrett’s esophagus, gastric mucosal intestinalization (especially large intestinalization) and endomorphic changes, etc. Most pre-cancerous states or pre-cancerous lesions can be reversed and restored to normal after a period of time or a longer period of time, proper combined Chinese and Western medicine treatment and comprehensive conditioning. In some cases, the process of lesions can be slowed down through treatment and conditioning, but ultimately cannot be stopped. Even if the lesions are surgically removed, new tumors may still grow in the same place or other parts. Maintaining a good lifestyle and psychological state, adjusting the rhythm of work, and proper TCM conditioning can help the body repair damage, improve immune function and prevent the occurrence of tumors.