A small, sliding ball that can be palpated in the jaw may be a lymphoma, but more often it should be considered a lymph node in the jaw. The diagnosis of tumors is complex and often cannot be determined by palpation. A small ball in the jaw that can be felt sliding is most often considered to be a lymph node, which many people can find during physical examination. If the lymph node is enlarged with pain, it is considered to be the result of infection in the jaw or oral cavity. If the treatment is not timely, the infection is likely to worsen and even septic lymphadenitis may occur. Lymphatic metastasis usually occurs only when the tumor progresses to the middle and late stages, when a lump at the lymph node may appear, along with other obvious physical symptoms such as fever, and the diagnosis can be confirmed only after imaging examination. When inflammatory submandibular lymph node enlargement is present, anti-inflammatory treatment is recommended as prescribed by the doctor. If it is a lymph node tumor, CT or ultrasound examination should be completed to clarify the specific location of the tumor and perform tumor treatment as soon as possible.