癌症的发生,除了外界致癌因素以外,还与身体内部因素有关。老年人容易生癌的内因是身体免疫力下降。现代科学研究证明,在人体细胞新陈代谢过程中,也会有些细胞发生异常的变化,如果人体的免疫功能状态良好,人体内具有 The occurrence of cancer, in addition to outside carcinogenic factors, but also with the body’s internal factors. The internal cause of cancer in older people is a drop in body immunity. Modern scientific research shows that in the process of human cell metabolism, there will be some abnormal changes in cells, if the body’s immune function in good condition, the body has