Hidden pain in the groin may have several common causes such as inguinal lymphadenitis, inguinal hernia and appendicitis. 1. Inguinal lymphadenitis: when bacterial infection occurs in the soft tissues near the groin area or lower limbs, the inflammation will spread to the inguinal lymph nodes, resulting in inguinal lymphadenitis, and the inflammatory mediators will stimulate the peripheral nerves, leading to vague pain in the groin. 2. Inguinal hernia: Due to the weak musculofascial tissue in the inguinal region, the contents of the abdominal cavity protrude through the weak area to the surface of the body, forming an inguinal hernia. The protruding mass will be ischemic, resulting in vague pain in the groin. 3. Appendicitis: The main symptom of appendicitis is pain in the right lower abdomen, which may be accompanied by diarrhea and vomiting. When appendicitis is prolonged for a long time, the secretion of inflammatory mediators will lead to vague pain in the groin. Infections in the buttocks, perineum and other places, trauma, metastasis of malignant tumors and other causes can also lead to vague pain in the groin on that side. There may be other causes of groin pain, and it is recommended that the patient go to the hospital in a timely manner to determine the cause of the disease, and then under the guidance of the doctor to correctly deal with it.