Modern people talk about cancer and always classify cancer as an incurable disease, but in fact, the poor efficacy of cancer is inseparable from the confusion in treatment. If you get out of the misunderstanding, you will find that many cancers can be cured. One of the misconceptions is that patients often look for “good doctors” and accept the treatment of so-called “partial prescriptions” and “ancestral secret prescriptions”, or even be deceived by charlatans and take their homemade fake drugs, which not only cannot be cured, but also delay the disease and lose the opportunity of early treatment, causing difficulties for regular treatment and greatly reducing the efficacy. The second misconception is that many patients believe in or rely excessively on certain nutritional supplements and are misled by the propaganda of curing all diseases, which delays the treatment time. In fact, these supplements can only be used as an adjunct to nutritional support. Moreover, the cost of simple adjunctive nutrition is much higher than regular treatment, which is beyond the reach of many patients. The third misconception is that most patients lose the opportunity of surgery because they cannot be detected early. Even if there is a chance of surgery, surgical resection is a limited treatment, which cannot eradicate the tumor cells in the blood. Therefore, radiotherapy is also necessary after surgery to consolidate the effect of treatment. Because doctors cannot grasp the conventional dose of radiotherapy, incorrect irradiation site or inaccurate grasp, there are many problems. The fifth misconception is that some patients think they are cured after the symptoms are relieved or the lump disappears, so they give up the treatment, which results in recurrence or metastasis soon and deterioration of the disease, so that all the treatment is abandoned. Therefore, it is very necessary to review regularly and continue treatment, especially for patients whose symptoms have improved. It is wise for tumor patients to get out of the misunderstanding of seeking medical treatment, choose the regular hospital, and insist on the comprehensive treatment of surgery, radiotherapy and chemotherapy until complete cure.