The main reason is the sudden change of temperature, which leads to human disharmony.
No matter what season, as long as the temperature changes, it will lead to diseases, such as winter, from warm indoor to cold outdoor, not enough clothes, being blown by cold air, catching a cold, we say that catching a cold is actually a defense obstacle caused by temperature changes. It's very hot in summer. We broke out in a sweat, suddenly reached a cool wind mouth, and then caught a cold. In fact, it was caused by temperature change, but we said it was warm evil, but it was actually caused by temperature change.
So, why do most people have no problems? And only a few people are sick? Huangdi Neijing said, "When pathogenic factors gather, they will be deficient in qi", because some people's bodies are inherently deficient in vital qi, so as long as the temperature changes, they will get sick. As I said before, I soaked in cold water, and then I got sick. In fact, this person's body must be deficient in vital qi, so this will happen. I have a friend who once played at the seaside and then called me to ask why I was there. Because the kidney meridian of foot shaoyin passes through the heel, many people will have this situation. Later, she got lumbar disease, which was very painful. It can be seen that her kidney deficiency is serious.
Therefore, if this happens, it is reminding us that the healthy qi of the body is insufficient and needs adjustment and exercise.
The next question is, does swimming really hurt the yang? What about a cold shower? In fact, swimming should pay attention to the way. I asked people who participated in the winter swimming, this winter swimming is to break the ice surface of rivers and lakes in three or nine days and then go swimming. Many people think that this is courage. They take off their clothes and jump in. In fact, if you do this, your heart will probably stop beating suddenly. A real winter swimmer needs a process, such as wiping his body with cold water first, getting used to it, and then going outdoors.
The same is true for people who take long-term cold showers. At first, they just dipped a towel in cold water to wipe their bodies, and then gradually switched to taking a cold shower instead of washing them with cold water when they came up.
The human body is very adaptable. From the cold arctic to the hot equator in the south, people live well and live well. People in the Arctic don't necessarily have yang deficiency, and people near the equator don't necessarily have yin deficiency. They are all athletes. Therefore, as long as we have an adaptation process, we can face many harsh environments.
For example, if you adapt to swimming step by step, you will soon adjust your body to a state that can resist the cold, which is a good exercise opportunity for many people who are weak.
There are many examples, saying that the body was not good at first, and then insisted on taking a cold bath, and the result was good.
Because the human body has strengthened its resistance in order to adapt, the already weak defense system has been strengthened.
In the cold water bath, the blood vessels of the human body have to undergo several contraction and relaxation processes, which is the exercise of blood vessels. Many people who take a long-term cold bath have healthy cardiovascular and cerebrovascular diseases.
There is a famous example in Chinese medicine, which is the hottest medicine, aconite. I have been thinking about it. When I was at school, Teacher Hao Wanshan said that when I was a student, he and his teacher went up the mountain to collect medicine and found a plant in the coolest ravine. He thought, what is this? Growing up in such a cold environment? When asked, it turned out to be aconite. Although the weather is hot, its growing environment is always the coldest and darkest. Teacher Hao Wanshan praised in the most lyrical tone: Aconitum, Aconitum, it is in such a cold environment that you have exercised your cold resistance!
So, remember, our body's adjustment ability is very strong. If we give it time to adapt, it will give you strong resistance.
If you take a planned cold bath every day, it will be good for your health.
For those who lack healthy qi, even those who have yang deficiency, my suggestion is that you need to adjust your body a little before you can do this kind of exercise.