1. A sudden outburst of anger will impair yin qi.
2. A sudden outburst of laughter will impair yang qi.
3. So if joy and anger are not restrained, if you don't adapt yourself to the cold and heat, your life will not be strong.
4. Yin can be transformed to yang and yang can be transformed to yin.
Also learn more in the article Acupuncture Single Points for ADHD.