Nasopharyngeal cancer belongs to the category of “cancer” in Chinese medicine, and Huperzia serrata has certain therapeutic effect on nasopharyngeal cancer caused by heat toxin. Nasopharyngeal cancer patients are recommended to go to hospital for MRI and pathological examination, once diagnosed, surgery is needed as soon as possible, and traditional Chinese medicine can only play the role of auxiliary treatment. White-flowered Snake Tongue Herb is a kind of heat-clearing traditional Chinese medicine, which has the effect of clearing away heat and detoxification (clearing away heat and toxicity in the body), inducing dampness and clearing away gonorrhea, and can be used for treating carbuncle, swelling and sores, sore throat, venomous snake bites, and feverish gonorrhea (burning and tingling pain in urination, accompanied by frequent urination and urgent urination, and discomfort of abdominal pulling) and astringent pain in the clinic. Thus, Hedyotis diffusa has certain therapeutic effect on nasopharyngeal carcinoma caused by heat toxicity, but clinically it is not usually used as a single traditional Chinese medicine to treat the disease, and it is usually used in combination with other traditional Chinese medicines. The adverse effects or contraindications of Hedyotis diffusa are not clear, and it should be used under the guidance of professional Chinese medicine practitioners, and should not be used without authorization.