For example, you have been in a state of panic, always thinking that there is a ghost in this world, always following yourself, or something like that. Or you've been sad. For example, if you are lovelorn, you can't go out for about a year or two. Being immersed in sadness all the time can also make you miserable. Long-term immersion in certain emotions will affect your health. General mood swings will not have an impact, but will make the body healthier because of some release.
It is worth noting that Chinese medicine is an empirical science, and there is no scientific basis in many aspects, so it is not so accurate. It is only said that a certain emotion may affect the health of an organ. As for the specific extent, it is not mentioned, because there will be no clear answer, and this kind of thing is just attractive.
Anyway, all of us should remember that it is good not to be immersed in certain emotions for a long time, even if we are always too happy. Everything should be measured, especially China's traditional philosophy, which attaches great importance to the golden mean. That's why it's almost enough. If it exceeds that level, there will be bad phenomena, whether it is great joy or great sorrow, which will cause some harm to the body, but it will not harm the body, and may also cause some psychological diseases.