Is the COVID-19 vaccine considered cooling or heating in nature?
COVID-19 vaccines are generally not classified as "cooling" or "heating" in nature. If you experience any discomfort, it is recommended to seek medical attention promptly. The detailed explanation is as follows:

COVID-19 vaccines do not fall under the category of cooling or heating substances, a conclusion based on their inherent properties and compatibility with traditional Chinese medicine (TCM) theory regarding medicinal natures. In TCM, the classification of a substance's nature depends on the body's thermal or cold reactions after its use. However, vaccines primarily consist of processed viral antigens designed to stimulate the immune system to produce antibodies, rather than regulate organ functions through traditional medicinal properties. Localized redness, swelling, or mild fever following vaccination are normal signs of immune activation and are fundamentally different from bodily changes caused by traditionally defined cooling or heating medicinal effects. Therefore, such vaccines cannot be categorized according to the concept of thermal nature.
After vaccination, keep the injection site clean and dry to prevent infection, avoiding contact with water. In terms of diet, reduce intake of spicy and irritating foods, and consume more fresh fruits, vegetables, and high-quality proteins to provide essential nutrients for recovery. Maintain a regular sleep schedule and avoid staying up late to allow the immune system sufficient rest. If you experience mild discomfort, there's no need for excessive concern—simply monitor your symptoms. However, if symptoms persist or worsen, consult a qualified healthcare provider promptly.