Immunity is like a firewall for human health, and when there is a gap in this wall, the body will reflect it. In addition to the inevitable decline in immune function brought about by age, immune system decline is often carried out silently, the main consequence is that the body is more vulnerable to external aggression such as viruses, bacteria, etc., and will also affect the normal functioning of the endocrine, neurological and other systems, leading to a series of problems caused by endocrine disruption. Poor mental health, fatigue, feeling uncomfortable … these discomforts that you ignore may be reminding you to pay attention to their immune function. An increase in the number of colds, slower wound healing, etc., indicates that the immune function is declining faster, and more seriously, the body’s ability to fight tumors may also be reduced, making it more likely to develop cancer. It is important to note that the most important thing for the normal functioning of the immune system is balance. Too low a level of resistance to external aggression can lead to many risks, but too high a level can lead to problems such as allergies and immune diseases.