Oral metastatic tumors are uncommon and account for about 1% of malignant oral neoplasm. The metastatic lesions are common in breast, lung, kidney and thyroid cancer. About 20% of oral mucosal metastasis is founded before detection of primary lesions. Usually, the metastatic lesions of the oral cavity are involved in the jaw bone, especially mandible more than the oral soft tissues. We report a case diagnosed as the stomach cancer with mandible metastatic lesion looking like TMJ abscess.