We experienced 7 cases of patients who were performed 99mTc-methylene diphosphonate bone scintigraphy for the evaluation of diseases they had, Their bone scintigrams showed incidental radionuclide upiake in the gastrointestinal tracts and they had no special symptom or sign attributable to the findings, Case 1 showed radionuclide uptake in the stomach and both lung and the patient had suffered from hypercalcemia and azotemia. Case 3 and case 6 showed diffuse radionuclide uptake in the stomach and intestinal tract, Others shawed diffuse or regional radionuclide uptake in the intestinal tracts. Radionuclide uptake in tbe gastrointestinal tract by 99mTc-methylene diphosphonate is caused by a certain pathologic lesion but also can be seen in the normal gastrointestinal tract. So, one who reads bone scintigrams should be alert for the pathologic lesion in the gastrointestinal tract although one must interpretate with the concept of this normal variations.