As a medicine, aged vinegar has the efficacy of dispersing blood stasis, stopping bleeding, settling roundworms and detoxifying, but as a food, it has no therapeutic effect when used alone. Aged vinegar is a liquid containing acetic acid brewed from sorghum, barley and other grains, with sour and sweet flavor, warm medicinal properties, and belongs to liver and stomach meridians. It is mainly used for internal consumption, but when used for the treatment of carbuncle, swelling, sores and poison, it is often used for external application, fumigation or immersion of the affected area. However, as a food, it has no therapeutic effect when used alone. The adverse reaction of Chen vinegar is not clear, but it should be prohibited for those who are allergic to Chen vinegar, and used with caution for those who have dampness and heat in spleen and stomach (spleen and stomach feel dampness and heat), impotence paralysis, and contracture of tendons and veins. Chen vinegar should be taken under the guidance of traditional Chinese medicine practitioners, and should not be used blindly on its own, so as not to cause any misunderstanding of the condition.