The Yellow Emperor's Internal Classic says: "blood stasis at the bottom makes people crazy, and blood stasis at the top makes people forget.". The ancients' summary of the law of blood stasis in human body is amazing.
There is a cloud in Huangdi Neijing: "Blood stasis in the lower part makes people crazy, while blood stasis in the upper part makes people forget". The ancient people's summary of the law of human blood stasis is impressive.