Thigh bone fossa lymph, that is, the lymph node group in the groin area, the area is a little painful, the possible causes are bacterial or viral infection, lymph node inflammation, tuberculosis and so on. 1. Bacterial or viral infection: a little pain in the lymph of the thigh bone fossa may be caused by the body being infected by bacteria or virus. There are many immune cells and lymphocytes in the lymph nodes. When bacteria or viruses attack the patient’s body, it leads to an increasing number of lymphocytes and the symptoms of swollen and painful lymph nodes. 2. Lymphadenitis: It may be an inflammation of lymph nodes caused by bacterial infection, and its main manifestation is swollen and painful lymph nodes. If the lymph nodes in the thigh bone fossa of the patient show inflammatory reaction, it will cause a bit painful symptoms. 3. Tuberculosis: lymphatic pain in the thigh bone fossa may also be caused by tuberculosis. Thigh bone fossa lymph a little pain may also have other reasons, it is recommended to go to the regular hospital in time, improve the relevant examination, clear the cause of the disease, under the guidance of the doctor for targeted treatment or treatment.