Garlic boiled in water is not usually useful for treating colds and flu; garlic is effective in stopping diarrhea, killing insects, detoxifying and reducing swelling. Garlic is the bulb of the lily plant garlic, harvested in the summer when the leaves are withered, remove the whiskers and sediment, and air dry in a ventilated place until the outer skin is dry. Garlic is warm in nature, pungent in taste, attributed to the spleen meridian, stomach meridian, lung meridian, has the efficacy of stopping dysentery, killing worms, detoxifying and reducing swellings, and is mainly used for the treatment of dysentery, diarrhea, tonic cough, consumption, scabies, carbuncle sores and ulcers, etc., and is usually not available for the treatment of colds and runny noses. The adverse reactions and contraindications of garlic are still unclear. It is recommended that patients who are not feeling well go to a regular hospital in time, and follow the doctor’s instructions for symptomatic treatment.