mustard, a traditional Chinese medicine, is white mustard seed, which is a kind of medicine. It is hot and expectorant. The so-called hair is actually warm in food. For those with internal heat, eating hot food will make the fire rise, which is hair. For mustard, it is hair. Therefore, if you have a disease of excessive internal heat, you can't eat it. However, if it is yang deficiency, and there is phlegm, you can eat mustard if you are afraid of cold and don't get angry.