To protect human health, our body has three lines of defense, simply put: first line of defense: skin and mucous membranes; second line of defense: various protective cells; third line of defense: immune system. Today, we will focus on the relationship between the third line of defense “immune system” and cancer. If the immunity is low, cancer cells cannot be recognized, so these mutated “bad cells” will become bigger and stronger, so they will have the strength and become a vassal, and cancer will be formed and start to threaten people’s health. So, does a high immune system mean no cancer? No! A high immunity will produce many overreactions, then tumors will take advantage of the chaos to rise up and take over one side, threatening the human body. Therefore, it is not good to have a strong or weak immune system, but to avoid dysregulation and maintain a balance is the best. In fact, tumor cells are produced in human body every day, there may be more than one million of them, but the innate immune system will form a defense and protection mechanism, this system is like an army in the body, which can identify the cells that are unfavorable to the body and destroy and remove them at any time. If the immune function is abnormal, the system will not be able to recognize malignant cells, and over time, these cells will become more and more numerous and eventually form tumors. Sleeping every day can repair the immune system If it really cannot remove malignant cells, the immune system still has repair function, and repair enzymes are usually activated during sleep, and many cancer patients are defective in repair enzymes, so sleep is very important.