Heat toxin refers to the internal accumulation of heat toxins. When these heat toxins are latent within the body, and when resistance is insufficient or triggered by certain factors, they can lead to the development of abscesses, high fever, headache, dry mouth, sore throat, joint pain, skin rashes, hematemesis, nosebleeds, confusion, a deep red tongue with a burnt coating or even prickles, a floating and rapid pulse, or a deep and thin rapid pulse. These are all symptoms caused by internal toxins.