A Chinese friend who has diabetes does not believe in TCM at all. His family and my family are quite close so we contact very often. He thinks it is good to have some pills from conventional medicine to have his diabetes under control.
TCM seems like some old trash in his eyes. But he knows that those pills can only control his blood sugar. He feels that his health condition is getting worse and worse.
Once I went to visit them and asked him how he was. He shook his head. Before, after physical exercises, he felt better. In spite of body weight or blood sugar, everything worked well with physical exercises. But now he felt weak and physical exercises gave him headache. He did not know what to do to help his body.
I told him that the headache after physical exercise was not related to his diabetes. It was because he went out while he was sweating on his head. This reminded him that he did go out of the room directly into outside while he was sweating on his head.
From a cold environment to a warm environment, our body needs some time to get used to. It is the same from a warm environment to a cold environment. Our body also needs some time to do the adjustment.
The better health you have, the better ability you have to do this adjustment.
If our body has not enough time to do the adjustment, problem could occur. That part exposed most should be the first to be felt. So it is easy to understand why headache happens when he went out with sweating on his head.