If you have a hard lump inside your chin with a little pain, you should consult with a surgeon or a pentacenter because a hard lump inside your chin with a little pain is most commonly seen in the case of under-chin lymph node enlargement or stomatological diseases, including oral tumors and so on. The nature of the lump can be initially determined by palpation and examination by the surgeon, and the nature and location of the lump can only be clearly diagnosed through ultrasound or nuclear magnetic examination if necessary before treatment can be provided. If the lump in the chin is simply caused by enlarged lymph nodes under the chin, further examination should be done to find out the cause of the problem, and the diagnosis should be confirmed by blood tests. Some infectious diseases can cause enlarged lymph nodes, and serious diseases such as leukemia and metastasis of cancer can cause swollen lymph nodes under the chin, which can only be treated through examination. If the hard lump with pain inside the chin is caused by an oral tumor, the patient’s health can only be ensured through examination and treatment by a dental specialist.