Some people usually have no physical discomfort. In the flu phase, when a cold breaks out, these diseases rarely occur. This situation is related to strong resistance and is a sign that the body's defense ability becomes stronger. Viruses and bacteria are difficult to invade the human body, so they will not get sick for a long time. But once you are ill for a long time, it may be serious, which may be caused by the destruction of immune mechanism after the invasion of the disease. Due to the different types of diseases, some common diseases are difficult to appear under the condition of strong resistance, and once serious diseases appear, they may damage people's immune system and give people the impression that the diseases are more serious. In this case, we should know the types of diseases. Generally, diseases with a higher degree of deterioration may become more serious after invasion, which is related to the destruction of immune mechanism. How to improve resistance? 1. Pay attention to reasonable exercise. If you want to improve your immune function, you should pay attention to exercise problems at ordinary times. Reasonable exercise is an effective measure to improve your immune function. Many people's low immune function is related to lack of exercise. If you don't exercise for a long time, your body function will decline, your resistance will easily decline, and even your resistance will cause diseases. Therefore, we should pay attention to sports problems and combine healthy exercise to improve physical fitness. Only after the immune function is enhanced can we maintain a healthy state. 2, adhere to a healthy diet In order to effectively improve immune function, a reasonable diet is the key, and the impact of diet on human health is more obvious. If you always have the wrong eating behavior, overeating and eating foods harmful to human health, it may affect your health. If we can pay attention to the rationalization of diet and add more protein and vitamins beneficial to human health, the general immune function can also be improved and diseases caused by low immune function can be prevented. 3, keep enough sleep, when the immune function is low, the body is vulnerable to attack, so it is necessary to enhance the immune ability through reasonable means. Generally, people who want to improve their immune function can get enough sleep, and sleep conditioning is also an effective measure to improve their immune ability. Because diseases may invade after the immune function is low, and sleep can regulate the body, improve organ function, and the immune ability will gradually improve.