How is blood heat caused?

Blood heat is also called excessive heat in blood, or heat entering Ying blood. The causes of blood heat can be divided into exogenous and internal injuries. Exogenous heat is mostly caused by exogenous fever, or pathogenic toxin of warm disease, etc. Purging heat into the interior and injuring Ying blood. Clinical manifestations can be seen such as high fever, dizziness, upset, skin spots, red tongue and yellow fur, thin pulse, etc. Blood heat caused by internal injuries is mostly caused by emotional disorder, qi depression turning into heat, or prolonged illness due to over-taking warm drugs. Internal injuries caused by blood heat to upset, dry mouth, hot flashes, tongue red drop and other manifestations of the main.