Gastrectomy is the most common treatment for gastric cancer, but patients often suffer from post-operative side effects. This study describes the clinical effects of HyangSaPyungWiSan on a pateint who suffered from nausea, vomitting, indigestion, headache, abdomen pain, and loss of appetite after his gastrectomy. The patient undewent a gastrectomy due to gastric cancer, and HyangSaPyungWiSan was used to treat all thses symptoms. This study suggests that treatment with HyangSaPyungWiSan is effectious for such aftereffects of gastrectomy as nausea, vomitting, indigestion, headache, abdomen pain, and loss of appetite.