Good appetite and wasting may not necessarily be cancer. At this time, it needs to be combined with blood glucose testing because diabetic patients often present with excessive drinking, overeating, polyuria and wasting. The probability of clinical consultation with oncology is also higher if the appetite is good and wasting, if it is progressive wasting. First rule out whether it is diabetes, need to do glucose test, including fasting blood sugar, two-hour postprandial blood sugar, glycated hemoglobin, glucose tolerance test to rule out diabetes. Attention needs to be paid to hyperthyroidism. Patients with hyperthyroidism sometimes also show a strong appetite and a lethargic body. Patients may have to be checked for abnormal thyroid function, and if they have hyperthyroidism they should be treated for hyperthyroidism. If the above two causes are ruled out, tumor problems also need to be ruled out again. Because there is a type of tumor that may secrete ectopic hormones that cause good appetite and wasting, this particular type of cancer needs to be ruled out.