How is a cold caused?

A cold due to heat is caused by infection with wind and fever, called disharmony between Ying and Wei. Ying and Wei refer to two kinds of healthy qi on the body surface, Ying qi and Wei qi. If the function coordination between the two is not good, it will cause diseases. Its main clinical manifestation is heat syndrome, which will show sweating, cough, headache, sore throat, itchy throat, elevated body temperature, etc.