Pain at the junction of the lower abdomen and thigh can be caused by an inguinal hernia or a femoral hernia. Inguinal hernia is relatively common, femoral hernia is relatively rare, however, femoral hernia is particularly prone to incarceration, that is, the contents of the hernia is mainly small intestine, easy to incarceration in the hernia ring, can not be returned to enter the abdominal cavity, which caused the contents of necrosis, so the femoral hernia diagnosis is clear and should be immediately after the surgical treatment. If the pain is caused by inguinal hernia, the mass is in the inguinal area, and most of the mass can enter the abdominal cavity after pressing the mass by hand or lying down. If the mass can not enter the abdominal cavity, it also means that there is an incarceration, which requires timely surgical treatment, otherwise the contents may become necrotic.