Hidden pain in the left groin can be seen in lymphadenitis, inguinal hernia, etc. It is also necessary to be alert to lymphoma or metastatic cancer, etc. It is necessary to consult a doctor in time to clarify the cause of the disease and treat it actively. 1. Lymphadenitis: the inflammation of lymph nodes may be induced after the patient suffers from bacterial infection, and the patient may manifest as multiple lymph node enlargement in the left groin and cause pain. 2. Inguinal hernia: mainly due to the weakness of the abdominal wall tissue at the lesion site, the internal tissues and organs of the abdominal cavity protrude through the weak abdominal wall area, forming a variable-sized mass and causing pain. 3. Tumor disease: patients with malignant tumors may be due to the malignant proliferation of tumor cells metastasis caused by the patient’s left inguinal lymph nodes of different degrees of enlargement and cause pain. Hidden pain in the left groin is also seen in other reasons, need to consult a doctor in time, under the guidance of the doctor to standardize the examination and treatment, in order to avoid delaying the condition.