Purpose: This study tested the effects of Nei-Guan acupressure on nausea, vomiting, and anorexia of lung cancer patients on chemotherapy. Methods: A nonequivalent control group pre-post test design was used to identify the effect of Nei-Guan acupressure on nausea, vomiting, and anorexia of lung cancer patients on chemotherapy. The participants were 60 patients who were admitted to a hospital for chemotherapy from February 1 to October 28, 2009. The patients were randomly assigned to the control group (n=30) or experimental group (n=30). The data were analyzed using Mann-Whitney test. Results: Nausea, vomiting, and anorexia were significantly decreased in the experiment group compared to the control group on the day of discharge from the hospital. However, the levels of nausea, vomiting, and anorexia between two groups were not statistically significant seven days after the discharge. Conclusions: Nei-Guan acupressure is effective in decreasing nausea, vomiting and anorexia of the patients with lung cancer on chemotherapy on the on the day of the discharge while the effectiveness is not certain 7 days after the discharge. Further study is needed to confirm these findings.